{"id":6964,"date":"2026-09-24T09:00:00","date_gmt":"2026-09-24T09:00:00","guid":{"rendered":"https:\/\/otus.ru\/journal\/?p=6964"},"modified":"2026-09-25T15:26:40","modified_gmt":"2026-09-25T15:26:40","slug":"c-sharp-i-cikly","status":"publish","type":"post","link":"https:\/\/otus.ru\/journal\/c-sharp-i-cikly\/","title":{"rendered":"\u0426\u0438\u043a\u043b\u044b \u0432 C#: for, while, do-while \u0438 foreach \u0441 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u043c\u0438"},"content":{"rendered":"

\u0426\u0438\u043a\u043b \u0432 C#<\/strong> — \u044d\u0442\u043e \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044f, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u0435\u0442 \u0431\u043b\u043e\u043a \u043a\u043e\u0434\u0430, \u043f\u043e\u043a\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0438\u043b\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0435\u0440\u0435\u0431\u0440\u0430\u043d\u044b \u0432\u0441\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438. \u0412 C# \u0447\u0435\u0442\u044b\u0440\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \u0446\u0438\u043a\u043b\u0430: for<\/code> (\u0441\u043e \u0441\u0447\u0435\u0442\u0447\u0438\u043a\u043e\u043c), while<\/code> (\u0441 \u043f\u0440\u0435\u0434\u0443\u0441\u043b\u043e\u0432\u0438\u0435\u043c), do-while<\/code> (\u0441 \u043f\u043e\u0441\u0442\u0443\u0441\u043b\u043e\u0432\u0438\u0435\u043c) \u0438 foreach<\/code> (\u043f\u0435\u0440\u0435\u0431\u043e\u0440 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438, \u0443 \u043d\u0435\u0433\u043e \u0435\u0441\u0442\u044c \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f \u0444\u043e\u0440\u043c\u0430 await foreach<\/code> \u0441 C# 8). \u0423\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u0445\u043e\u0434\u043e\u043c \u0446\u0438\u043a\u043b\u0430 \u043f\u043e\u043c\u043e\u0433\u0430\u044e\u0442 break<\/code> \u0438 continue<\/code>.<\/p>\n

\n

\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435<\/strong><\/p>\n

    \n
  1. \u0427\u0435\u0442\u044b\u0440\u0435 \u0446\u0438\u043a\u043b\u0430 \u043d\u0430 \u043e\u0434\u043d\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435<\/a><\/li>\n
  2. \u041a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d \u043a\u0430\u0436\u0434\u044b\u0439 \u0446\u0438\u043a\u043b<\/a><\/li>\n
  3. \u041a\u0430\u043a\u043e\u0439 \u0446\u0438\u043a\u043b \u0432\u044b\u0431\u0440\u0430\u0442\u044c<\/a><\/li>\n
  4. break \u0438 continue<\/a><\/li>\n
  5. \u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u0446\u0438\u043a\u043b\u0430\u0445 C<\/a><\/li>\n
  6. \u0415\u0441\u043b\u0438 \u0446\u0438\u043a\u043b \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0435 \u0442\u0430\u043a<\/a><\/li>\n
  7. \u0412\u044b\u0432\u043e\u0434\u044b<\/a><\/li>\n
  8. \u0413\u0434\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \/ \u0441\u0432\u044f\u0437\u044c \u0441 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u043e\u0439<\/a><\/li>\n
  9. FAQ<\/a><\/li>\n<\/ol>\n<\/div>\n

    \u041d\u0438\u0436\u0435 — \u043e\u0434\u0438\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043f\u0440\u0438\u043c\u0435\u0440 \u0441\u043e \u0432\u0441\u0435\u043c\u0438 \u0447\u0435\u0442\u044b\u0440\u044c\u043c\u044f \u0446\u0438\u043a\u043b\u0430\u043c\u0438, \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u0432\u044b\u0431\u043e\u0440\u0430, \u0440\u0430\u0437\u0431\u043e\u0440 break<\/code>\/continue<\/code> \u0438 \u0442\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u0441 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u043c \u0432\u044b\u0432\u043e\u0434\u043e\u043c \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0430 \u0438 \u0441\u0440\u0435\u0434\u044b. \u0412\u0441\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u0435\u043d\u044b \u043d\u0430 .NET SDK 10.0.401 (C# 14) 24 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f 2026 \u0433\u043e\u0434\u0430.<\/p>\n

    \u0427\u0435\u0442\u044b\u0440\u0435 \u0446\u0438\u043a\u043b\u0430 \u043d\u0430 \u043e\u0434\u043d\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435<\/h2>\n

    \u041a\u043e\u0434 \u043d\u0438\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0432 \u0444\u0430\u0439\u043b loops.cs<\/code> \u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439 dotnet run loops.cs<\/code> (\u0432 .NET 10 \u0444\u0430\u0439\u043b \u0431\u0435\u0437 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u0442\u0441\u044f \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e). \u0412 \u043e\u0431\u044b\u0447\u043d\u043e\u043c \u043a\u043e\u043d\u0441\u043e\u043b\u044c\u043d\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u0435 \u0442\u043e\u0442 \u0436\u0435 \u043a\u043e\u0434 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 Program.cs<\/code>.<\/p>\n

    int<\/span>[] <\/span>prices<\/span> <\/span>=<\/span> { <\/span>120<\/span>, <\/span>45<\/span>, <\/span>300<\/span>, <\/span>80<\/span> };<\/span>\n\n\/\/ for: \u043d\u0443\u0436\u0435\u043d \u0438\u043d\u0434\u0435\u043a\u0441 \u0438\u043b\u0438 \u0448\u0430\u0433<\/span>\nint<\/span> <\/span>total<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nfor<\/span> (<\/span>int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>i<\/span> <\/span><<\/span> <\/span>prices<\/span>.<\/span>Length<\/span>; <\/span>i<\/span>++<\/span>)<\/span>\n{<\/span>\n    <\/span>total<\/span> <\/span>+=<\/span> <\/span>prices<\/span>[<\/span>i<\/span>];<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"for: \u0441\u0443\u043c\u043c\u0430 = {total}\"<\/span>);<\/span>\n\n\/\/ foreach: \u043d\u0443\u0436\u043d\u044b \u0442\u043e\u043b\u044c\u043a\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b<\/span>\nint<\/span> <\/span>max<\/span> <\/span>=<\/span> <\/span>int<\/span>.<\/span>MinValue<\/span>;<\/span>\nforeach<\/span> (<\/span>int<\/span> <\/span>p<\/span> <\/span>in<\/span> <\/span>prices<\/span>)<\/span>\n{<\/span>\n    <\/span>if<\/span> (<\/span>p<\/span> <\/span>><\/span> <\/span>max<\/span>) <\/span>max<\/span> <\/span>=<\/span> <\/span>p<\/span>;<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"foreach: \u043c\u0430\u043a\u0441\u0438\u043c\u0443\u043c = {max}\"<\/span>);<\/span>\n\n\/\/ while: \u0447\u0438\u0441\u043b\u043e \u043f\u043e\u0432\u0442\u043e\u0440\u043e\u0432 \u0437\u0430\u0440\u0430\u043d\u0435\u0435 \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e<\/span>\nint<\/span> <\/span>balance<\/span> <\/span>=<\/span> <\/span>500<\/span>;<\/span>\nint<\/span> <\/span>months<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nwhile<\/span> (<\/span>balance<\/span> <\/span>>=<\/span> <\/span>120<\/span>)<\/span>\n{<\/span>\n    <\/span>balance<\/span> <\/span>-=<\/span> <\/span>120<\/span>;<\/span>\n    <\/span>months<\/span>++<\/span>;<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"while: \u043f\u043e\u0434\u043f\u0438\u0441\u043a\u0430 \u043d\u0430 {months} \u043c\u0435\u0441., \u043e\u0441\u0442\u0430\u0442\u043e\u043a {balance}\"<\/span>);<\/span>\n\n\/\/ do-while: \u0442\u0435\u043b\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u0441\u044f \u0445\u043e\u0442\u044f \u0431\u044b \u043e\u0434\u0438\u043d \u0440\u0430\u0437<\/span>\nstring<\/span>[] <\/span>inputs<\/span> <\/span>=<\/span> { <\/span>\"abc\"<\/span>, <\/span>\"\"<\/span>, <\/span>\"42\"<\/span> }; <\/span>\/\/ \u0438\u043c\u0438\u0442\u0430\u0446\u0438\u044f \u0432\u0432\u043e\u0434\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f<\/span>\nint<\/span> <\/span>step<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nint<\/span> <\/span>number<\/span>;<\/span>\ndo<\/span>\n{<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"do-while: \u0432\u0432\u043e\u0434 \\\"{inputs[step]}\\\"\"<\/span>);<\/span>\n    <\/span>step<\/span>++<\/span>;<\/span>\n} <\/span>while<\/span> (<\/span>!<\/span>int<\/span>.<\/span>TryParse<\/span>(<\/span>inputs<\/span>[<\/span>step<\/span> <\/span>-<\/span> <\/span>1<\/span>], <\/span>out<\/span> <\/span>number<\/span>));<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"do-while: \u0447\u0438\u0441\u043b\u043e {number} \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043e \u0441 \u043f\u043e\u043f\u044b\u0442\u043a\u0438 {step}\"<\/span>);<\/span><\/code><\/pre>\n
    \u0412\u044b\u0432\u043e\u0434:<\/p>\n
    for: \u0441\u0443\u043c\u043c\u0430 = 545\nforeach: \u043c\u0430\u043a\u0441\u0438\u043c\u0443\u043c = 300\nwhile: \u043f\u043e\u0434\u043f\u0438\u0441\u043a\u0430 \u043d\u0430 4 \u043c\u0435\u0441., \u043e\u0441\u0442\u0430\u0442\u043e\u043a 20\ndo-while: \u0432\u0432\u043e\u0434 "abc"\ndo-while: \u0432\u0432\u043e\u0434 ""\ndo-while: \u0432\u0432\u043e\u0434 "42"\ndo-while: \u0447\u0438\u0441\u043b\u043e 42 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043e \u0441 \u043f\u043e\u043f\u044b\u0442\u043a\u0438 3\n<\/code><\/pre>\n
    \u041a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d \u043a\u0430\u0436\u0434\u044b\u0439 \u0446\u0438\u043a\u043b<\/h2>\n
    for — \u0446\u0438\u043a\u043b \u0441\u043e \u0441\u0447\u0435\u0442\u0447\u0438\u043a\u043e\u043c<\/h3>\n
    \u0417\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a for (\u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f; \u0443\u0441\u043b\u043e\u0432\u0438\u0435; \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u044f)<\/code> \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0438\u0437 \u0442\u0440\u0435\u0445 \u0447\u0430\u0441\u0442\u0435\u0439. \u041f\u043e\u0440\u044f\u0434\u043e\u043a \u0442\u0430\u043a\u043e\u0439: \u043e\u0434\u0438\u043d \u0440\u0430\u0437 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f (int i = 0<\/code>), \u0437\u0430\u0442\u0435\u043c \u043f\u0435\u0440\u0435\u0434 \u043a\u0430\u0436\u0434\u044b\u043c \u043f\u0440\u043e\u0445\u043e\u0434\u043e\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442\u0441\u044f \u0443\u0441\u043b\u043e\u0432\u0438\u0435 (i < prices.Length<\/code>), \u0435\u0441\u043b\u0438 \u043e\u043d\u043e \u0438\u0441\u0442\u0438\u043d\u043d\u043e — \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043b\u043e, \u043f\u043e\u0441\u043b\u0435 \u0442\u0435\u043b\u0430 — \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u044f (i++<\/code>), \u0438 \u0441\u043d\u043e\u0432\u0430 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0443\u0441\u043b\u043e\u0432\u0438\u044f.<\/p>\n
    \u041f\u0440\u043e\u0433\u043e\u043d \u0440\u0443\u043a\u0430\u043c\u0438 \u0434\u043b\u044f \u043c\u0430\u0441\u0441\u0438\u0432\u0430 \u0438\u0437 4 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432: i = 0, 1, 2, 3<\/code> — \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0438\u0441\u0442\u0438\u043d\u043d\u043e, \u0442\u0435\u043b\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f; \u043f\u0440\u0438 i = 4<\/code> \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u043b\u043e\u0436\u043d\u043e, \u0446\u0438\u043a\u043b \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u0435\u0442\u0441\u044f. \u041f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f i<\/code> \u043e\u0431\u044a\u044f\u0432\u043b\u0435\u043d\u0430 \u0432 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0435 \u0438 \u043f\u043e\u0441\u043b\u0435 \u0446\u0438\u043a\u043b\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u0430.<\/p>\n
    \u0412\u0441\u0435 \u0442\u0440\u0438 \u0447\u0430\u0441\u0442\u0438 \u043d\u0435\u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b: for (;;)<\/code> — \u0431\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u044b\u0439 \u0446\u0438\u043a\u043b, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u044e\u0442 \u0447\u0435\u0440\u0435\u0437 break<\/code> \u0438\u043b\u0438 return<\/code>. \u0428\u0430\u0433 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043b\u044e\u0431\u044b\u043c: i += 2<\/code> \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430, i--<\/code> \u0434\u043b\u044f \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0445\u043e\u0434\u0430.<\/p>\n
    while — \u0446\u0438\u043a\u043b \u0441 \u043f\u0440\u0435\u0434\u0443\u0441\u043b\u043e\u0432\u0438\u0435\u043c<\/h3>\n
    while (\u0443\u0441\u043b\u043e\u0432\u0438\u0435) { ... }<\/code> \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0434\u043e \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043f\u0440\u043e\u0445\u043e\u0434\u0430. \u0415\u0441\u043b\u0438 \u043e\u043d\u043e \u043b\u043e\u0436\u043d\u043e \u0441 \u0441\u0430\u043c\u043e\u0433\u043e \u043d\u0430\u0447\u0430\u043b\u0430, \u0442\u0435\u043b\u043e \u043d\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u0441\u044f \u043d\u0438 \u0440\u0430\u0437\u0443. \u041f\u043e\u0434\u0445\u043e\u0434\u0438\u0442, \u043a\u043e\u0433\u0434\u0430 \u0447\u0438\u0441\u043b\u043e \u043f\u043e\u0432\u0442\u043e\u0440\u043e\u0432 \u0437\u0430\u0440\u0430\u043d\u0435\u0435 \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e: \u0447\u0438\u0442\u0430\u0442\u044c, \u043f\u043e\u043a\u0430 \u0435\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435; \u0443\u043c\u0435\u043d\u044c\u0448\u0430\u0442\u044c \u0431\u0430\u043b\u0430\u043d\u0441, \u043f\u043e\u043a\u0430 \u0445\u0432\u0430\u0442\u0430\u0435\u0442 \u0434\u0435\u043d\u0435\u0433.<\/p>\n
    do-while — \u0446\u0438\u043a\u043b \u0441 \u043f\u043e\u0441\u0442\u0443\u0441\u043b\u043e\u0432\u0438\u0435\u043c<\/h3>\n
    do { ... } while (\u0443\u0441\u043b\u043e\u0432\u0438\u0435);<\/code> \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0442\u0435\u043b\u043e, \u043f\u043e\u0442\u043e\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u0443\u0441\u043b\u043e\u0432\u0438\u0435. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0442\u0435\u043b\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043c\u0438\u043d\u0438\u043c\u0443\u043c \u043e\u0434\u0438\u043d \u0440\u0430\u0437. \u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439 — \u0437\u0430\u043f\u0440\u043e\u0441\u0438\u0442\u044c \u0432\u0432\u043e\u0434 \u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u0442\u044c, \u043f\u043e\u043a\u0430 \u043e\u043d \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0435\u043d. \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0442\u043e\u0447\u043a\u0443 \u0441 \u0437\u0430\u043f\u044f\u0442\u043e\u0439 \u043f\u043e\u0441\u043b\u0435 while (...)<\/code> — \u0432 do-while<\/code> \u043e\u043d\u0430 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u0430.<\/p>\n
    foreach — \u043f\u0435\u0440\u0435\u0431\u043e\u0440 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438<\/h3>\n
    foreach (var \u044d\u043b\u0435\u043c\u0435\u043d\u0442 in \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u044f)<\/code> \u043f\u0440\u043e\u0445\u043e\u0434\u0438\u0442 \u043f\u043e \u043c\u0430\u0441\u0441\u0438\u0432\u0443, \u0441\u043f\u0438\u0441\u043a\u0443, \u0441\u0442\u0440\u043e\u043a\u0435 (\u043f\u043e \u0441\u0438\u043c\u0432\u043e\u043b\u0430\u043c) \u0438 \u043b\u044e\u0431\u043e\u043c\u0443 \u0442\u0438\u043f\u0443 \u0441 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0438\u043c \u043c\u0435\u0442\u043e\u0434\u043e\u043c GetEnumerator()<\/code> (\u0435\u0433\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c MoveNext()<\/code> \u0438 Current<\/code>). \u0418\u043d\u0434\u0435\u043a\u0441 \u0437\u0434\u0435\u0441\u044c \u043d\u0435 \u043d\u0443\u0436\u0435\u043d, \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u0433\u0440\u0430\u043d\u0438\u0446\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430 \u043d\u0435\u043b\u044c\u0437\u044f. \u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f: \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u0446\u0438\u043a\u043b\u0430 \u043d\u0435\u043b\u044c\u0437\u044f \u043f\u0440\u0438\u0441\u0432\u043e\u0438\u0442\u044c, \u0430 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u044e \u043d\u0435\u043b\u044c\u0437\u044f \u043c\u0435\u043d\u044f\u0442\u044c \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u043f\u0435\u0440\u0435\u0431\u043e\u0440\u0430 (\u043e\u0431\u0430 \u0441\u043b\u0443\u0447\u0430\u044f \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043d\u044b \u043d\u0438\u0436\u0435). \u041f\u043e\u0434\u0440\u043e\u0431\u043d\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e foreach<\/code> \u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 IEnumerable<\/code> — \u0442\u0435\u043c\u0430 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u0431\u043e\u0440\u0430, \u0437\u0434\u0435\u0441\u044c \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u0430\u0432\u0438\u043b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f.<\/p>\n
    \u0423\u0441\u043b\u043e\u0432\u0438\u0435 — \u0442\u043e\u043b\u044c\u043a\u043e bool<\/h3>\n
    \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 C \u0438 C++, \u0432 C# \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0446\u0438\u043a\u043b\u0430 \u043e\u0431\u044f\u0437\u0430\u043d\u043e \u0438\u043c\u0435\u0442\u044c \u0442\u0438\u043f bool<\/code>. \u041a\u043e\u0434 while (n)<\/code>, \u0433\u0434\u0435 n<\/code> — \u0446\u0435\u043b\u043e\u0435, \u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f:<\/p>\n
    error CS0029: Cannot implicitly convert type 'int' to 'bool'\n<\/code><\/pre>\n
    \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u044f\u0432\u043d\u043e\u0435 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435: while (n != 0)<\/code>. \u041a\u0430\u043a \u0442\u0435 \u0436\u0435 \u0446\u0438\u043a\u043b\u044b \u0432\u044b\u0433\u043b\u044f\u0434\u044f\u0442 \u0432 C \u0438 C++, \u0433\u0434\u0435 \u0447\u0438\u0441\u043b\u043e \u0432 \u0443\u0441\u043b\u043e\u0432\u0438\u0438 \u0434\u043e\u043f\u0443\u0441\u0442\u0438\u043c\u043e, \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043d\u043e \u0432 \u0441\u0442\u0430\u0442\u044c\u0435 \u043e \u0446\u0438\u043a\u043b\u0430\u0445 \u0432 C \u0438 C++<\/a>.<\/p>\n
    \u041a\u0430\u043a\u043e\u0439 \u0446\u0438\u043a\u043b \u0432\u044b\u0431\u0440\u0430\u0442\u044c<\/h2>\n\n\n\n\n\n\n\n\n\n
    \u0417\u0430\u0434\u0430\u0447\u0430<\/th>\n\u0426\u0438\u043a\u043b<\/th>\n\u041f\u043e\u0447\u0435\u043c\u0443<\/th>\n<\/tr>\n<\/thead>\n
    \u041f\u0440\u043e\u0439\u0442\u0438 \u0432\u0441\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b, \u0438\u043d\u0434\u0435\u043a\u0441 \u043d\u0435 \u043d\u0443\u0436\u0435\u043d<\/td>\nforeach<\/code><\/td>\n\u041a\u043e\u0440\u043e\u0447\u0435 \u0438 \u0431\u0435\u0437 \u0440\u0438\u0441\u043a\u0430 \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u0433\u0440\u0430\u043d\u0438\u0446\u044b<\/td>\n<\/tr>\n
    \u041d\u0443\u0436\u0435\u043d \u0438\u043d\u0434\u0435\u043a\u0441, \u0448\u0430\u0433, \u043e\u0431\u0440\u0430\u0442\u043d\u044b\u0439 \u043f\u043e\u0440\u044f\u0434\u043e\u043a, \u0441\u043e\u0441\u0435\u0434\u043d\u0438\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b<\/td>\nfor<\/code><\/td>\n\u0421\u0447\u0435\u0442\u0447\u0438\u043a \u043f\u043e\u0434 \u043f\u043e\u043b\u043d\u044b\u043c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0435\u043c<\/td>\n<\/tr>\n
    \u041f\u043e\u0432\u0442\u043e\u0440\u044f\u0442\u044c, \u043f\u043e\u043a\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0443\u0441\u043b\u043e\u0432\u0438\u0435, \u0447\u0438\u0441\u043b\u043e \u0448\u0430\u0433\u043e\u0432 \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e<\/td>\nwhile<\/code><\/td>\n\u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0434\u043e \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0445\u043e\u0434\u0430<\/td>\n<\/tr>\n
    \u0422\u0435\u043b\u043e \u0434\u043e\u043b\u0436\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c\u0441\u044f \u0445\u043e\u0442\u044f \u0431\u044b \u0440\u0430\u0437 (\u0432\u0432\u043e\u0434, \u043c\u0435\u043d\u044e, \u043f\u043e\u0432\u0442\u043e\u0440 \u0437\u0430\u043f\u0440\u043e\u0441\u0430)<\/td>\ndo-while<\/code><\/td>\n\u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0445\u043e\u0434\u0430<\/td>\n<\/tr>\n
    \u0423\u0434\u0430\u043b\u044f\u0442\u044c \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0441\u043f\u0438\u0441\u043a\u0430 \u043f\u043e \u0443\u0441\u043b\u043e\u0432\u0438\u044e<\/td>\nfor<\/code> \u0441 \u043a\u043e\u043d\u0446\u0430 \u0438\u043b\u0438 RemoveAll<\/code><\/td>\nforeach<\/code> \u043d\u0435 \u0440\u0430\u0437\u0440\u0435\u0448\u0430\u0435\u0442 \u043c\u0435\u043d\u044f\u0442\u044c \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u044e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u0423\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u0435: \u043b\u044e\u0431\u043e\u0439 \u0446\u0438\u043a\u043b \u043c\u043e\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u0430\u0442\u044c \u0447\u0435\u0440\u0435\u0437 while<\/code>, \u0442\u0430\u043a \u0447\u0442\u043e \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u0433\u043e\u0432\u043e\u0440\u0438\u0442 \u043e \u0447\u0438\u0442\u0430\u0435\u043c\u043e\u0441\u0442\u0438 \u0438 \u0442\u0438\u043f\u0438\u0447\u043d\u043e\u043c \u0440\u0438\u0441\u043a\u0435 \u043e\u0448\u0438\u0431\u043e\u043a, \u0430 \u043d\u0435 \u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044f\u0445.<\/p>\n
    break \u0438 continue<\/h2>\n
    continue<\/code> \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442 \u043e\u0441\u0442\u0430\u0442\u043e\u043a \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u043f\u0440\u043e\u0445\u043e\u0434\u0430 \u0438 \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0438\u0442 \u043a \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c\u0443. break<\/code> \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u0435\u0442 \u0446\u0438\u043a\u043b \u0446\u0435\u043b\u0438\u043a\u043e\u043c.<\/p>\n
    int<\/span>[] <\/span>data<\/span> <\/span>=<\/span> { <\/span>4<\/span>, <\/span>-<\/span>1<\/span>, <\/span>7<\/span>, <\/span>0<\/span>, <\/span>9<\/span>, <\/span>3<\/span> };<\/span>\n\n\/\/ continue: \u043f\u0440\u043e\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u044e<\/span>\nint<\/span> <\/span>sum<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nforeach<\/span> (<\/span>int<\/span> <\/span>x<\/span> <\/span>in<\/span> <\/span>data<\/span>)<\/span>\n{<\/span>\n    <\/span>if<\/span> (<\/span>x<\/span> <\/span><=<\/span> <\/span>0<\/span>) <\/span>continue<\/span>;   <\/span>\/\/ \u043e\u0442\u0440\u0438\u0446\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0438 \u043d\u043e\u043b\u044c \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u043c<\/span>\n    <\/span>sum<\/span> <\/span>+=<\/span> <\/span>x<\/span>;<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"\u0441\u0443\u043c\u043c\u0430 \u043f\u043e\u043b\u043e\u0436\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 = {sum}\"<\/span>);<\/span>\n\n\/\/ break: \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u0446\u0438\u043a\u043b\u0430 \u043f\u0440\u0438 \u043f\u0435\u0440\u0432\u043e\u0439 \u043d\u0430\u0445\u043e\u0434\u043a\u0435<\/span>\nint<\/span> <\/span>index<\/span> <\/span>=<\/span> <\/span>-<\/span>1<\/span>;<\/span>\nfor<\/span> (<\/span>int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>i<\/span> <\/span><<\/span> <\/span>data<\/span>.<\/span>Length<\/span>; <\/span>i<\/span>++<\/span>)<\/span>\n{<\/span>\n    <\/span>if<\/span> (<\/span>data<\/span>[<\/span>i<\/span>] <\/span>><\/span> <\/span>5<\/span>)<\/span>\n    {<\/span>\n        <\/span>index<\/span> <\/span>=<\/span> <\/span>i<\/span>;<\/span>\n        <\/span>break<\/span>;<\/span>\n    }<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"\u043f\u0435\u0440\u0432\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u0431\u043e\u043b\u044c\u0448\u0435 5 - \u0438\u043d\u0434\u0435\u043a\u0441 {index}\"<\/span>);<\/span>\n\n\/\/ break \u0432\u043e \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u043e\u043c \u0446\u0438\u043a\u043b\u0435 \u0432\u044b\u0445\u043e\u0434\u0438\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0437 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0433\u043e<\/span>\nint<\/span>[,] <\/span>grid<\/span> <\/span>=<\/span> { { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span> }, { <\/span>4<\/span>, <\/span>99<\/span>, <\/span>6<\/span> }, { <\/span>7<\/span>, <\/span>8<\/span>, <\/span>9<\/span> } };<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>$\"\u043f\u043e\u0437\u0438\u0446\u0438\u044f 99: {Find(grid, 99)}\"<\/span>);<\/span>\n\nstatic<\/span> <\/span>string<\/span> <\/span>Find<\/span>(<\/span>int<\/span>[,] <\/span>g<\/span>, <\/span>int<\/span> <\/span>target<\/span>)<\/span>\n{<\/span>\n    <\/span>for<\/span> (<\/span>int<\/span> <\/span>r<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>r<\/span> <\/span><<\/span> <\/span>g<\/span>.<\/span>GetLength<\/span>(<\/span>0<\/span>); <\/span>r<\/span>++<\/span>)<\/span>\n        <\/span>for<\/span> (<\/span>int<\/span> <\/span>c<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>c<\/span> <\/span><<\/span> <\/span>g<\/span>.<\/span>GetLength<\/span>(<\/span>1<\/span>); <\/span>c<\/span>++<\/span>)<\/span>\n            <\/span>if<\/span> (<\/span>g<\/span>[<\/span>r<\/span>, <\/span>c<\/span>] <\/span>==<\/span> <\/span>target<\/span>)<\/span>\n                <\/span>return<\/span> <\/span>$\"\u0441\u0442\u0440\u043e\u043a\u0430 {r}, \u0441\u0442\u043e\u043b\u0431\u0435\u0446 {c}\"<\/span>; <\/span>\/\/ return \u0432\u044b\u0445\u043e\u0434\u0438\u0442 \u0438\u0437 \u043e\u0431\u043e\u0438\u0445 \u0446\u0438\u043a\u043b\u043e\u0432<\/span>\n    <\/span>return<\/span> <\/span>\"\u043d\u0435 \u043d\u0430\u0439\u0434\u0435\u043d\u043e\"<\/span>;<\/span>\n}<\/span><\/code><\/pre>\n
    \u0412\u044b\u0432\u043e\u0434:<\/p>\n
    \u0441\u0443\u043c\u043c\u0430 \u043f\u043e\u043b\u043e\u0436\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 = 23\n\u043f\u0435\u0440\u0432\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u0431\u043e\u043b\u044c\u0448\u0435 5 - \u0438\u043d\u0434\u0435\u043a\u0441 2\n\u043f\u043e\u0437\u0438\u0446\u0438\u044f 99: \u0441\u0442\u0440\u043e\u043a\u0430 1, \u0441\u0442\u043e\u043b\u0431\u0435\u0446 1\n<\/code><\/pre>\n
    \u0412\u043e \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u0446\u0438\u043a\u043b\u0430\u0445 break<\/code> \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0431\u043b\u0438\u0436\u0430\u0439\u0448\u0438\u0439 \u0446\u0438\u043a\u043b. \u0427\u0442\u043e\u0431\u044b \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u043e\u0431\u043e\u0438\u0445, \u0443\u0434\u043e\u0431\u043d\u0435\u0435 \u0432\u0441\u0435\u0433\u043e \u0432\u044b\u043d\u0435\u0441\u0442\u0438 \u0446\u0438\u043a\u043b\u044b \u0432 \u043c\u0435\u0442\u043e\u0434 \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c return<\/code>, \u043a\u0430\u043a \u0432 Find<\/code>. \u0414\u0440\u0443\u0433\u0438\u0435 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u044b — \u0444\u043b\u0430\u0433, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u0432\u043d\u0435\u0448\u043d\u0438\u0439 \u0446\u0438\u043a\u043b, \u0438\u043b\u0438 goto<\/code> \u043d\u0430 \u043c\u0435\u0442\u043a\u0443 \u043f\u043e\u0441\u043b\u0435 \u0446\u0438\u043a\u043b\u043e\u0432 (\u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043d\u043e \u0447\u0438\u0442\u0430\u0435\u0442\u0441\u044f \u0445\u0443\u0436\u0435).<\/p>\n
    \u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u0446\u0438\u043a\u043b\u0430\u0445 C<\/h2>\n
    \u0412\u044b\u0445\u043e\u0434 \u0437\u0430 \u0433\u0440\u0430\u043d\u0438\u0446\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430<\/h3>\n
    int<\/span>[] <\/span>a<\/span> <\/span>=<\/span> { <\/span>10<\/span>, <\/span>20<\/span>, <\/span>30<\/span> };<\/span>\nfor<\/span> (<\/span>int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>i<\/span> <\/span><=<\/span> <\/span>a<\/span>.<\/span>Length<\/span>; <\/span>i<\/span>++<\/span>)<\/span>\n{<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>a<\/span>[<\/span>i<\/span>]);<\/span>\n}<\/span><\/code><\/pre>\n
    \u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442: \u0442\u0440\u0438 \u0447\u0438\u0441\u043b\u0430, \u0437\u0430\u0442\u0435\u043c \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043d\u0430 i = 3<\/code>:<\/p>\n
    10\n20\n30\nUnhandled exception. System.IndexOutOfRangeException: Index was outside the bounds of the array.\n<\/code><\/pre>\n
    \u0418\u043d\u0434\u0435\u043a\u0441\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430 \u0438\u0437 3 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 — 0, 1, 2. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435: \u0443\u0441\u043b\u043e\u0432\u0438\u0435 i < a.Length<\/code> \u0438\u043b\u0438 foreach<\/code>, \u0435\u0441\u043b\u0438 \u0438\u043d\u0434\u0435\u043a\u0441 \u043d\u0435 \u043d\u0443\u0436\u0435\u043d.<\/p>\n
    \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438 \u0432\u043d\u0443\u0442\u0440\u0438 foreach<\/h3>\n
    var<\/span> <\/span>list<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>List<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span> };<\/span>\nforeach<\/span> (<\/span>int<\/span> <\/span>x<\/span> <\/span>in<\/span> <\/span>list<\/span>)<\/span>\n{<\/span>\n    <\/span>if<\/span> (<\/span>x<\/span> <\/span>%<\/span> <\/span>2<\/span> <\/span>==<\/span> <\/span>0<\/span>) <\/span>list<\/span>.<\/span>Remove<\/span>(<\/span>x<\/span>);<\/span>\n}<\/span><\/code><\/pre>\n
    Unhandled exception. System.InvalidOperationException: Collection was modified; enumeration operation may not execute.\n<\/code><\/pre>\n
    \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u043e\u0431\u0440\u0430\u0442\u043d\u044b\u0439 for<\/code> (\u043f\u0440\u0438 \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0438 \u0441 \u043a\u043e\u043d\u0446\u0430 \u0438\u043d\u0434\u0435\u043a\u0441\u044b \u0435\u0449\u0435 \u043d\u0435 \u043f\u0440\u043e\u0439\u0434\u0435\u043d\u043d\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u043d\u0435 \u0441\u0434\u0432\u0438\u0433\u0430\u044e\u0442\u0441\u044f) \u0438\u043b\u0438 \u0433\u043e\u0442\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434:<\/p>\n
    var<\/span> <\/span>list<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>List<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span> };<\/span>\nfor<\/span> (<\/span>int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>list<\/span>.<\/span>Count<\/span> <\/span>-<\/span> <\/span>1<\/span>; <\/span>i<\/span> <\/span>>=<\/span> <\/span>0<\/span>; <\/span>i<\/span>--<\/span>)<\/span>\n{<\/span>\n    <\/span>if<\/span> (<\/span>list<\/span>[<\/span>i<\/span>] <\/span>%<\/span> <\/span>2<\/span> <\/span>==<\/span> <\/span>0<\/span>) <\/span>list<\/span>.<\/span>RemoveAt<\/span>(<\/span>i<\/span>);<\/span>\n}<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>list<\/span>));   <\/span>\/\/ 1, 3<\/span>\n\nvar<\/span> <\/span>list2<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>List<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span> };<\/span>\nlist2<\/span>.<\/span>RemoveAll<\/span>(<\/span>x<\/span> <\/span>=><\/span> <\/span>x<\/span> <\/span>%<\/span> <\/span>2<\/span> <\/span>==<\/span> <\/span>0<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>list2<\/span>));  <\/span>\/\/ 1, 3<\/span><\/code><\/pre>\n
    \u041f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u043d\u0438\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 foreach<\/h3>\n
    \u041a\u043e\u0434 foreach (int x in a) { x = x * 2; }<\/code> \u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f:<\/p>\n
    error CS1656: Cannot assign to 'x' because it is a 'foreach iteration variable'\n<\/code><\/pre>\n
    \u0427\u0442\u043e\u0431\u044b \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430, \u043d\u0443\u0436\u0435\u043d for<\/code> \u0441 \u0438\u043d\u0434\u0435\u043a\u0441\u043e\u043c: a[i] = a[i] * 2<\/code>.<\/p>\n
    \u0422\u043e\u0447\u043a\u0430 \u0441 \u0437\u0430\u043f\u044f\u0442\u043e\u0439 \u043f\u043e\u0441\u043b\u0435 while<\/h3>\n
    int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nwhile<\/span> (<\/span>i<\/span> <\/span><<\/span> <\/span>3<\/span>);<\/span>\n{<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>i<\/span>);<\/span>\n    <\/span>i<\/span>++<\/span>;<\/span>\n}<\/span><\/code><\/pre>\n
    \u0422\u043e\u0447\u043a\u0430 \u0441 \u0437\u0430\u043f\u044f\u0442\u043e\u0439 \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u043f\u0443\u0441\u0442\u044b\u043c \u0442\u0435\u043b\u043e\u043c \u0446\u0438\u043a\u043b\u0430, \u0430 \u0431\u043b\u043e\u043a \u0432 \u0441\u043a\u043e\u0431\u043a\u0430\u0445 — \u043e\u0431\u044b\u0447\u043d\u044b\u043c \u043a\u043e\u0434\u043e\u043c \u043f\u043e\u0441\u043b\u0435 \u043d\u0435\u0433\u043e. \u0423\u0441\u043b\u043e\u0432\u0438\u0435 i < 3<\/code> \u043d\u0438\u043a\u043e\u0433\u0434\u0430 \u043d\u0435 \u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f, \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0437\u0430\u0432\u0438\u0441\u0430\u0435\u0442 \u0431\u0435\u0437 \u0432\u044b\u0432\u043e\u0434\u0430. \u041a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0430\u0435\u0442, \u043d\u043e \u0441\u0431\u043e\u0440\u043a\u0443 \u043d\u0435 \u043e\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442:<\/p>\n
    warning CS0642: Possible mistaken empty statement\n<\/code><\/pre>\n
    \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u0443\u0431\u0440\u0430\u0442\u044c ;<\/code> \u043f\u043e\u0441\u043b\u0435 while (i < 3)<\/code>. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u0441\u0442\u043e\u0438\u0442 \u0447\u0438\u0442\u0430\u0442\u044c, \u0430 \u043d\u0435 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u0430\u0442\u044c.<\/p>\n
    \u0411\u0435\u0437\u0437\u043d\u0430\u043a\u043e\u0432\u044b\u0439 \u0441\u0447\u0435\u0442\u0447\u0438\u043a \u0432 \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u043c \u0446\u0438\u043a\u043b\u0435<\/h3>\n
    int<\/span> <\/span>n<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span>\nfor<\/span> (<\/span>uint<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>3<\/span>; <\/span>i<\/span> <\/span>>=<\/span> <\/span>0<\/span>; <\/span>i<\/span>--<\/span>)<\/span>\n{<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>i<\/span>);<\/span>\n    <\/span>if<\/span> (<\/span>++<\/span>n<\/span> <\/span>==<\/span> <\/span>6<\/span>) <\/span>break<\/span>; <\/span>\/\/ \u0441\u0442\u0440\u0430\u0445\u043e\u0432\u043a\u0430, \u0438\u043d\u0430\u0447\u0435 \u0446\u0438\u043a\u043b \u0431\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u044b\u0439<\/span>\n}<\/span><\/code><\/pre>\n
    3\n2\n1\n0\n4294967295\n4294967294\n<\/code><\/pre>\n
    \u0422\u0438\u043f uint<\/code> \u043d\u0435 \u0431\u044b\u0432\u0430\u0435\u0442 \u043e\u0442\u0440\u0438\u0446\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c: \u043f\u043e\u0441\u043b\u0435 0 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0438\u0442 \u043a \u043c\u0430\u043a\u0441\u0438\u043c\u0443\u043c\u0443, \u0438 i >= 0<\/code> \u0438\u0441\u0442\u0438\u043d\u043d\u043e \u0432\u0441\u0435\u0433\u0434\u0430. \u0412 \u044d\u0442\u043e\u043c \u043f\u0440\u043e\u0433\u043e\u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044f \u043d\u0435 \u0432\u044b\u0434\u0430\u043b. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u0441\u0447\u0435\u0442\u0447\u0438\u043a \u0442\u0438\u043f\u0430 int<\/code>.<\/p>\n
    \u0421\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u0434\u0440\u043e\u0431\u043d\u043e\u0433\u043e \u0441\u0447\u0435\u0442\u0447\u0438\u043a\u0430 \u043d\u0430 \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e<\/h3>\n
    \u0426\u0438\u043a\u043b for (double x = 0; x != 1.0; x += 0.1)<\/code> \u043d\u0435 \u043e\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f: \u0438\u0437-\u0437\u0430 \u0434\u0432\u043e\u0438\u0447\u043d\u043e\u0433\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u043e\u0441\u043b\u0435 \u0434\u0435\u0441\u044f\u0442\u0438 \u0448\u0430\u0433\u043e\u0432 x<\/code> \u043d\u0435 \u0440\u0430\u0432\u0435\u043d \u0440\u043e\u0432\u043d\u043e 1.0. \u0412 \u043f\u0440\u043e\u0433\u043e\u043d\u0435 \u0441\u043e \u0441\u0442\u0440\u0430\u0445\u043e\u0432\u043a\u043e\u0439 \u043d\u0430 20 \u0448\u0430\u0433\u043e\u0432 \u0446\u0438\u043a\u043b \u043f\u0440\u043e\u0441\u043a\u043e\u0447\u0438\u043b \u0435\u0434\u0438\u043d\u0438\u0446\u0443 \u0438 \u0434\u043e\u0448\u0435\u043b \u0434\u043e x = 2.0000000000000004<\/code>. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0448\u0430\u0433\u0438 \u0446\u0435\u043b\u044b\u043c \u0441\u0447\u0435\u0442\u0447\u0438\u043a\u043e\u043c (for (int t = 0; t <= 10; t++)<\/code>, \u0430 x = t \/ 10.0<\/code>) \u0438\u043b\u0438 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0442\u044c \u0447\u0435\u0440\u0435\u0437 <<\/code>.<\/p>\n
    \u041b\u044f\u043c\u0431\u0434\u0430 \u0437\u0430\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u0435\u0442 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e for<\/h3>\n
    var<\/span> <\/span>fromFor<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>List<\/span><<\/span>Action<\/span>><\/span>();<\/span>\nfor<\/span> (<\/span>int<\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>0<\/span>; <\/span>i<\/span> <\/span><<\/span> <\/span>3<\/span>; <\/span>i<\/span>++<\/span>)<\/span>\n    <\/span>fromFor<\/span>.<\/span>Add<\/span>(() <\/span>=><\/span> <\/span>Console<\/span>.<\/span>Write<\/span>(<\/span>i<\/span> <\/span>+<\/span> <\/span>\" \"<\/span>));<\/span>\nforeach<\/span> (<\/span>var<\/span> <\/span>f<\/span> <\/span>in<\/span> <\/span>fromFor<\/span>) <\/span>f<\/span>();<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>\"<- for\"<\/span>);<\/span>\n\nvar<\/span> <\/span>fromForeach<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>List<\/span><<\/span>Action<\/span>><\/span>();<\/span>\nforeach<\/span> (<\/span>int<\/span> <\/span>n<\/span> <\/span>in<\/span> <\/span>new<\/span>[] { <\/span>0<\/span>, <\/span>1<\/span>, <\/span>2<\/span> })<\/span>\n    <\/span>fromForeach<\/span>.<\/span>Add<\/span>(() <\/span>=><\/span> <\/span>Console<\/span>.<\/span>Write<\/span>(<\/span>n<\/span> <\/span>+<\/span> <\/span>\" \"<\/span>));<\/span>\nforeach<\/span> (<\/span>var<\/span> <\/span>f<\/span> <\/span>in<\/span> <\/span>fromForeach<\/span>) <\/span>f<\/span>();<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>\"<- foreach\"<\/span>);<\/span><\/code><\/pre>\n
    3 3 3 <- for\n0 1 2 <- foreach\n<\/code><\/pre>\n
    \u0412 for<\/code> \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f i<\/code> \u043e\u0434\u043d\u0430 \u043d\u0430 \u0432\u0435\u0441\u044c \u0446\u0438\u043a\u043b, \u0438 \u0432\u0441\u0435 \u043b\u044f\u043c\u0431\u0434\u044b \u0432\u0438\u0434\u044f\u0442 \u0435\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 3. \u0412 foreach<\/code> \u0441 C# 5 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0441\u043e\u0437\u0434\u0430\u0435\u0442\u0441\u044f \u0437\u0430\u043d\u043e\u0432\u043e \u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u043c \u043f\u0440\u043e\u0445\u043e\u0434\u0435. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043b\u044f for<\/code> — \u043a\u043e\u043f\u0438\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u0442\u0435\u043b\u0430: int copy = i;<\/code> \u0438 \u0437\u0430\u0445\u0432\u0430\u0442 copy<\/code>.<\/p>\n
    \u0415\u0441\u043b\u0438 \u0446\u0438\u043a\u043b \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0435 \u0442\u0430\u043a<\/h2>\n