關於 do while(0) ，我們在網路上蒐集到這些相關的討論、資訊與評價

#11. do{...}while(0)的意义和用法 - 阿里云开发者社区

这里将函数主体使用do()while(0)包含起来，使用break来代替goto，后续的处理工作在while之后，就能够达到同样的效果。 3、避免空宏引起的warning. 内核中由于不同架构的 ...

#12. C++巧用do...while(0)-腾讯云开发者社区

腾讯云开发者社区是腾讯云官方开发者社区，致力于打造开发者的技术分享型社区。提供专栏,问答，沙龙等产品和服务，汇聚海量精品云计算使用和开发经验，致力于帮助开发 ...

#13. do{...}while(0)的意义和用法 - 华为云社区

【摘要】 转载自 http://www.spongeliu.com/  linux内核和其他一些开源的代码中，经常会遇到这样的代码： do{ ...}while(0) 这样的代码一看 ...

#14. do-while 陳述式(C)

在這個 do-while 陳述式中，會執行 y = f( x ); 和 x--; 兩個陳述式，無論 x 的初始值為何。 接下來會評估 x > 0 。 如果 x 大於0，則會再次執行語句主體 ...

#15. C语言基础：宏定义使用do{}while(0)的好处-电子发烧友网

C语言宏定义使用do{}while(0)的好处1. 概述 经常写项目代码，有时需要用到宏定义，而宏定义的用法是否标准，则是会影响到是否能快速查错以及代码拓展 ...

#16. 宏定义中的do {...} while (0)

宏的语句被 do{...}while(0) 包围起来。在很多C 库，包括Linux 内核中，这种情形都不少见。这种宏如何 ...

#17. do...while(0) in C/C++ Marco - Rui Liu

do …while(0) 是C和C++中宏定义函数常见的形式，一般是循环区域内是函数体，

#18. Is do ... while(0) obsolete? - Google Groups

all of Company's C programmers are busy with other projects. Some of this code contains multi-line macro definitions that are wrapped in a do ... while(0), as ...

#19. Do-while迴圈- 維基百科，自由的百科全書

do -while迴圈（英語：do while loop），也有稱do迴圈，是電腦程式語言中的一種控制 ... do { i--; } while (i > 0); Console.WriteLine(i); } } }. Java編輯. int i = 5 ...

#20. Difference between while(1) and while(0) in C language - Byju's

The while(0) loop means that the condition available to us will always be false. Function, Not just while(1), but every non-zero integer is capable of giving a ...

#21. Difference between while(1) and while(0) in C language

We write conditions in brackets(). Condition can either resolve to true or false. So 0 represents false and any value except it is true. so ...

#22. C語言在linux內核中do while(0)妙用之法 - 程式師世界

為什麼說do while(0) 妙？因為它的確就是妙，而且在linux內核中實現是相當的妙，我們來看看內核中的相關代碼： #define db_error(fmt, .

#23. Re: [問題] do{...}while(..) - 看板C_and_CPP - 批踢踢實業坊

... while(0); compiler 看起來就是if(...) do{}while(0); else do{}while(0); 變成合法的敘述了注意的是為了不讓同樣的事情再度發生macro 定義裡的while ...

#24. 【Day 18】while 迴圈／ do...while 迴圈 - iT 邦幫忙

如果test_Expression 的條件為否，就不會執行statement，直接跳出迴圈。 讓我們用 while 迴圈寫寫看累加： #include<stdio.h> int main(){ int i = 0 ...

#25. do {…} while (0) in macros | How Not To Code - WordPress.com

do {…}while(0) is the only construct in C that lets you define macros that always work the same way, so that a semicolon after your macro always ...

#26. What is the purpose of using do {...} while (0) in macros? - Quora

The while (0) at the end ensures a single iteration and as Robert Love points out in his answer, it ensures that the behavior of the macro is always the same ...

#27. do {...} while (0) 的用法 - qxdn 的乐园

因为物联网课要讲AliOS-Things的内核源码，发现了宏定义处有一个do{...}while(0)，仔细研究发现很妙，因此分享一下。

#28. do-while - Manual - PHP

$i = 0; do { echo $i; } while ($i > 0); ?> 以上循环将正好运行一次，因为经过第一次循环后，当检查表达式的真值时，其值为 false （ $i 不大于0）而导致循环终止 ...

#29. Swallowing the Semicolon (The C Preprocessor)

do {…} while (0);. which is one statement. The loop executes exactly once; most compilers generate no extra code for it.

#30. do...while loop

流程圖 · 語法：先進入迴圈執行一次，condition 再判斷是否成立？ · 範例：承上例輸入一數字，從1 累加到總數超過此數字。 · 編譯成功 · 執行結果：輸入0 或-3 程式持續要求 ...

#31. while迴圈| C++與演算法

5 20 50 40 40 30 50 10 0 50 50. Output. 70 80 80 10 100. code. #include<iostream> using namespace std; int main() { int n; int i; int a, b; cin >> n; i = 0 ...

#32. c++ do while(0) 原理- 台部落

c++ do while(0) 原理. 原創 blue0bird 2020-06-16 11:15. It's the only construct in C that you can use to #define a multistatement operation, put a semicolon ...

#33. Significance and use of do{...}while(0) | Pixelstech.net

while (0) to define empty macro. #define EMPTYMICRO do{}while(0). 4. Define a single function block to complete complex operations.

#34. C語言– do..while

while (1). {. do //輸入大於0的正整數. {. printf(“Input an integer:”);. scanf(“%d”, &a);. } while (a <=0);. printf(“The reverse is:”);. while (a!=0) //將正整數倒 ...

#35. 網頁設計及程式設計教學：while 與do-while 迴圈 - 藝誠網頁設計

... 0; do { Response.Write(numbers[i]); y++; } while(y < numbers.Length); int[] numbers = new int[] { 1, 3, 4, 6, 7, 9, 11, 17 }; int y = 0; while (y < numbers ...

#36. PRE10-C. Wrap multistatement macros in a do-while loop

This macro expands correctly in a normal sequence of statements but not as the then clause in an if statement: int x, y, z, tmp; if (z == 0) SWAP(x, y);. It ...

#37. 概況 - HackMD

do { ... } while(0) 巨集. 避開dangling else; 延伸閱讀: multi-line macro: do/while(0) vs scope block. 應用: String switch in C. #define STRING_SWITCH_L(s) ...

#38. C语言中while(1)和while(0)之间的区别

这意味着条件将始终为假, 因此while中的代码将永远不会执行。 while(0) { //loop does not run } ...

#39. while 迴圈 - OpenHome.cc

main(void) { int score = 0; int sum = 0; int count = -1; while(score != -1) ... do while 的語法如下所示： do { 陳述句一; 陳述句二; .... } while(條件式);.

#40. Difference between while(1) and while(0) in C ... - Tutorialspoint

On other hand while(0) is the loop where the condition is always treated as false and so the code inside the block never gets to start executing ...

#41. 为什么用do while(0) 替换goto - 百度知道

1、辅助定义复杂的宏，避免引用的时候出错： 举例来说，假设你需要定义这样一个宏： #define DOSOMETHING()\ foo1();\ foo2(); 这个宏的本意是，当 ...

#42. 19.4 do while(0) - MISRA Discussion Forums

I would recommend the committee to rephrase rule 19.4 so that it does not allow do-while-zero inside function-like macros. ... } while(0);. The above code is a " ...

#43. do-while-zero construct & MISRA Rule 19.4 - NXP Community

WRT: CodeWarrior IDE 5.9.0 / Target S12X] I am trying to comply with MISRA Rule 19.4, specifically the requirement that the do-while-zero.

#44. Java do_while 迴圈控制 - 翻轉工作室

... do/while 敘述的流程圖. 語法：. 範例：. do {. Statement 1;. Statement 2; …. }while ... (2) 第7~10 行：『do { ….}while(count > 0);』。Do/while 敘述句。 (3) 第 9 行 ...

#45. [ C++ ] While 迴圈與do-While 迴圈用法及使用時機 - 資料點

do-while loop 的使用時機: 雖然幾乎所有 do-while loop 都可以用while loop 來重現，但有些情況下，使用 do-while loop 能夠更直覺地呈現出程式的 ...

#46. do { } while (0); inspection – IDEs Support (IntelliJ Platform)

Hi, today I tried to use CLion for an old tool - normally I use IDEA for Java coding. I found an inspection for a do-while-loop that when...

#47. do {...} while (0) in macros : r/programming - Reddit

while (0) only runs the loop body a single time, while also allowing the use of a semicolon when used outside a conditional.

#48. C 速查手冊- 5.5 do-while 迴圈 - 程式語言教學誌

do -while 迴圈之中包含另一個do-while 迴圈 #include <stdio.h> int main(void) ... 0; } /* 《程式語言教學誌》的範例程式http://kaiching.org/ 檔名：dowhile99n.c ...

#49. Do-While Loops in the C Language - Linux Hint

... does not satisfy the escape condition. Let us look at an example where the escape condition in this case is “a” equals “0”: while ( a!=0 ){ //code… } For ...

#50. C语言while循环和do while循环详解 - C语言中文网

这个过程会一直重复，直到表达式的值为假（0），就退出循环，执行while 后面的代码。 我们通常将“表达式”称为循环条件，把“语句块”称为循环体，整个循环 ...

#51. do...while 語法- JavaScript - MDN Web Docs

do...while 語法會反覆執行直到指定條件的求值結果為false 為止。do...while 語法如下︰

#52. Advanced preprocessor tips and tricks - IAR Systems

An ancient trick-ofthe- trade called the "do { ... } while(0)" trick is presented. The article ends with a discussion on whether #if or #ifdef is preferable for ...

#53. C while and do...while Loop - Programiz

Example 2: do...while loop. // Program to add numbers until the user enters zero #include <stdio.h> int main() { double number, sum = 0; // the body of the ...

#54. Python Do While 循环示例 - freeCodeCamp

这里，变量 number 最初被设置为 0 。 在运行任何代码之前，Python 检查条件（ number < 10 ）。它的值为 True ，所以打印语句被 ...

#55. 条件为true 时重复执行的while 循环- MATLAB while

'r'); count = 0; while ~feof(fid) line = fgetl(fid); if isempty(line) ... 要模拟 do...while 循环的行为，请将 while 的初始条件设置为 true ，并将条件 ...

#56. do-while loop - cppreference.com - C++ Reference

This expression is evaluated after each iteration, and if it compares equal to zero, the loop is exited. statement, -, any statement, typically ...

#57. V696. The 'continue' operator will terminate 'do { ... } while ...

The analyzer has detected code that may mislead the programmer. Not every programmer is aware that the continue operator in the do { ... } while(0) loop ...

#58. Linux kernel coding style

... while (0). Things to avoid when using macros: macros that affect control flow: #define FOO(x) \ do { \ if (blah(x) < 0) \ return -EBUGGERED; \ } while (0). is ...

#59. Python "while" Loops (Indefinite Iteration)

... will never be executed at all: >>> >>> n = 0 >>> while n > 0: ... n -= 1 ... print(n) ... In the example above, when the loop is encountered, n is 0 . The ...

#60. Python while 迴圈(loop)基本認識與3種操作 - 自學成功道

你可以設定一個變數i，並在 while 後頭陳述符合需求的條件，條件是只要i小於101，就把i印出來。 i = 0 while i < 101: print(i) i = i + 1. 執行程式碼， ...

#61. c언어/c++ do while(0) - 업글인간의 정보 리뷰 - 티스토리

do while (0)는 조건이 무조건 거짓이기 때문에 해당하는 코드를 반복하지 않고 1회만 수행하게 됩니다. 이렇게 되면 do while(0)를 사용하지 않고 일반적 ...

#62. 第4章. 反覆計算：迴圈 - C/C++

do -while迴圈不論任何條件，至少都會執行一次循環，當一次循環結束，才檢查條件 ... while (x>0);. } 範例程式輸出: 輸入一個任意整數 : 3. x=3. x=2. x=1. 另一個程式輸出 ...

#63. C語言基本能力測驗選擇題

(C)以下何者是無止盡的while 迴路? (A) int n=1; while( n!= 0) ++n; (B)while('indefinite'); (C) while(1); (D) while(0);; (C)以下的程式中do … while 迴路會執行幾 ...

#64. PHP do while 迴圈 - Wibibi

$i=0; do{ $i++; echo $i.'-'; } while ( $i<10 ); ?> 執行結果. 1-2-3-4-5-6-7-8-9-10-. 範例中先設定一個變數初始值為零（$i=0），接著開始執行do while 迴圈，由於在 ...

#65. C++ do…while 循环 - 菜鸟教程

// do 循环执行 do { cout << "a 的值：" << a << endl; a = a + 1; }while( a < 20 ); return 0; }. 当上面的代码被编译和执行时，它会产生下列结果： a 的值： 10 a ...

#66. C Programming Course Notes - Looping Constructs

The following diagram shows the difference between while and do-while loops ... != 0 ) ; // Empty loop - Does nothing forever, until someFunction returns a ...

#67. clang-tidy - cppcoreguidelines-avoid-do-while

cppcoreguidelines-avoid-do-while¶. Warns when using do-while loops. They are less ... while(0). Defaults to false . « cppcoreguidelines-avoid-const-or-ref-data ...

#68. Loops: while and for - The Modern JavaScript Tutorial

The loop will first execute the body, then check the condition, and, while it's truthy, execute it again and again. For example: let i = 0 ...

#69. [Kernel] define 으로 do { ... } while(0) 많이 쓰는 이유

Kernel code 를 보면 do { // some codes.. } while(0) 를 많이 쓰고 있다. 이에 대한 이유를 보면,. 1. 빈 구문은 compiler 로 부터 왜 #define FOO do ...

#70. do-while(0)によるマクロラッピング - 闇夜のC++

do -while(0)によるマクロラッピング. 2015年5月1日 teppy. inline関数やconst変数を使ってもC言語時代に#defineマクロによって実現していたことの全てをカバーできる ...

#71. [Macro함수] 라이브러리 개발시 do while(0) 를 사용하는 이유

우리가 흔히 아는 문법인 do while은 잘 사용하지 않은 문법입니다. 하지만 라이브러리를 개발할 시에 do while 0 문은 아주 안정한 라이브러리 개발을 ...

#72. C語言if,switch,do,while,for分析- IT閱讀

do. {. if(NULL == p) break;. if(n < 0) break;. for(i = 0;i < n;i++). {. p[i] = i;. printf("%d\n",p[i]);. } ret = 1;. }while(0);. free(p);.

#73. Why does while [ 0 ] go into infinite loop? - Unix Stack Exchange

Single square brackets in the shell is a synonym for test (either the separate command or the shell built-in), so [ 0 ] means the same thing ...

#74. do{} while(0) - 曲径通幽论坛

在Linux 内核中，经常会看到do{} while(0) 。也许会认为，do{}while(0) 毫无意义，因为它只会执行一次，加不加do{}while(0) 效果完全一样。

#75. do { ... } while(0) 을 사용하는 이유 - 개발자스러운 블로그

do { ... } while(0) 을 사용하는 이유원문 : https://kernelnewbies.org/FAQ/DoWhile0리눅스 커널 등의 소스 코드를 보게 되면, "do { .

#76. Do while loop in C - Javatpoint

do while example · #include<stdio.h> · int main(){ · int i=1; · do{ · printf("%d \n",i); · i++; · }while(i<=10); · return 0; ...

#77. C/C++为什么要专门设计个do…while？ - 墨天轮

while (0) 中断顺序执行的逻辑. 这个条款适用于C、C++、Java等有 do ... while 用法的语言。由于Java中 ...

#78. do～while(0)とは何か？ - Qiita

do ～while(0)とは何か？ ... 0なのでループしないという謎ソースがあった。 よくよく聞いてみるとエラー処理などで一気に抜けたい場合などに使える ...

#79. While Loop - C Language Questions and Answers - Sanfoundry

C Programming Questions and Answers – While Loops – 1 · #include <stdio.h> · int main() · { · int i = 0; · do { · i++; · printf("In while loop\n"); · } while (i < 3);; }.

#80. do {} while(0) - 通信用語の基礎知識

前述した以下の定義は、動作しないコードを定義する方法の一つである。 #define hogehoge(x, y) do {} while(0). こうすると、ブロック{}で囲まれていないif文 ...

#81. Excel VBA 程式設計教學：迴圈控制，For Loop - G. T. Wang

以下是一個使用 Do While Loop 迴圈計算 1 到 10 總和的範例。 Dim i, s As Integer s = 0 i = 1 ...

#82. PRE10-C. 複数の文からなるマクロは do-while ループで包む

... do { \ tmp = (x); \ (x) = (y); \ (y) = tmp; } \ while (0). do-while ループは常に一度だけ実行される。 このコード例でも、マクロ引数が2回評価 ...

#83. DO WHILE Loop 指定條件重複動作教學(中文字幕) (可調節速度)

2023 HKDSE ICT Programming Syllabus 中三課程清Concept C Programming 程式編寫語言 WHILE / DO WHILE Loop 迴圈Apply control structures in a ...

#84. C# while、for、do-while 迴圈- 教學筆記(使用visual studio)

Length; int num = 0; while (num< aryLength) { Console.WriteLine(datas[num]); num++; //可以試試看，將num++改成num+=2 }. for. for的原理與while ...

#85. 【C言語】do-while(0)を避ける理由

【C言語】 do-while(0)を避ける理由 · warning: redundant continue statement at the end of loop statement · 問題1:何と表示されるでしょうか？ · 問題2: ...

#86. Objective-C 快速導覽- do-while 迴圈結構

... 0; int i = 1; do { sum += i++; } while (i <= 100); NSLog(@"1 + 2 + 3 + ... + 98 + 99 + 100 = %d", sum); [pool drain]; return 0; } /* 《程式語言教學誌》的 ...

#87. SystemVerilog while and do-while loop - ChipVerify

ncsim> run cnt = 0 cnt = 1 cnt = 2 cnt = 3 cnt = 4 ncsim: *W,RNQUIE: Simulation is complete. Example #2. module tb; initial begin int cnt; while ...

#88. when a while loop will stop - C Board

while ('\0') -----> loop will stop. i think there are many more conditions like above... so there are basically different rules. is there any ...

#89. 매크로에서 do { … } while(0) 을 사용하는 이유

리눅스 커널 소스를 살펴보다가 헤더쪽의 매크로에서 "do { ... } while(0)" 와 같은 것이 많이 쓰인 것을 보았다. 당연히 { .

#90. Bash While Loop Examples - nixCraft

while [ condition ]; do commands; done while control-command; do COMMANDS; done ... 0 exec 0<"$FILE" while read -r line do # use $line variable to ...

#91. Break Statement & Do While Loop

i=0 while ; x; cout<<"Input x:" ; i; i =-1 ...

#92. macro do { } while(0) - Generation-NT

039;jour, Quel est l'intérêt profond de déclarer des macros en do { } while (0) ? Par exemple dans l'idée: #define ...

#93. Loops in C : Learn for, while, do while loops. - CodesDope

... do...while loop. #include <stdio.h> int main() { int a = 1; do { printf( "Hello World\n" ); a ++; } while(a <= 10); return 0; }. Output. Hello World Hello ...

#94. 9.2. The while loop

i="0" while [ $i -lt 4 ] do xterm & i=$[$i+1] done. 9.2.2.2. Nested while loops. The example below was written to copy pictures that are made with a webcam to ...

#95. While loop - Learn Python 3 - Snakify

... do you think by sending feedback to: [email protected] (Vitaly). Goto line go python. 1. 2. 3. 4. 5. 6. n = int(input()). length = 0. while n != 0: length += ...

#96. C 語言之多行巨集- 不歸錄 - 大兜

有時候我們在翻閱原始碼的時候會看到類似這樣的寫法： #define FOO(x, y) \ do { \ typeof(x) tmp = x; \ x = y; \ y = tmp; \ } while (0).

#97. C While Loop - W3Schools

The do/while loop is a variant of the while loop. This loop will execute the code ... Example. int i = 0; do { printf("%d\n", i); i++; } while (i < 5);. Try it ...

#98. Loops: while(), for() and do .. while() - Physics and Astronomy

Here we learn about loops which allow sections of code to run zero or more times, with a controlling logical expression. The while() loop. The while() loop has ...