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Do while 宏

WebJun 24, 2024 · 宏被展开后，上面的调用语句会保留初始的语义，同时绝大部分编译器都能够识别do{...}while(0)这种无用的循环并进行优化，不会导致性能优化的降低。. 小结. 在Linux内核和驱动代码还有cocos2d-x中，很多宏实现都使用do{...}while(0)来包裹他们的逻辑，Google的Robert Love（先前从事Linux内核开发）给我们解答 ... WebIn most computer programming languages a do while loop is a control flow statement that executes a block of code and then either repeats the block or exits the loop depending on a given boolean condition.. The do while construct consists of a process symbol and a condition. First the code within the block is executed. Then the condition is evaluated. If …

嵌入式宏定义中do…while(0)的意义 - MaxSSL

WebSyntax. do {. // code block to be executed. } while (condition); The example below uses a do/while loop. The loop will always be executed at least once, even if the condition is false, because the code block is executed before the condition is tested: WebOct 25, 2024 · C++ Do/While Loop. Loops come into use when we need to repeatedly execute a block of statements. Like while the do-while loop execution is also terminated on the basis of a test condition. The main difference between a do-while loop and a while loop is in the do-while loop the condition is tested at the end of the loop body, i.e do-while … shizo death\u0027s storehouse tcg https://perituscoffee.com

关于宏定义中的do-while(0)循环 - CSDN博客

WebDec 18, 2024 · 宏定义为何使用do-while语句 最近在阅读开源代码的过程中，发现宏定义中大量使用了do-while语句。有时感觉这是不是多此一举呢。于是去网上查阅资料就有了 … Webwhile: Loops a code block while a condition is true: do...while: Loops a code block once, and then while a condition is true: for: Loops a code block while a condition is true: for...of: Loops the values of any iterable: for...in: Loops the properties of an object WebThis happens because a function (like `block_on`) attempted to block the current thread while the thread is being used to drive asynchronous tasks. thread ' tests:: test_sync_method ' panicked at ' Cannot start a runtime from within a runtime. This happens because a function ... 当select!宏 展开时，所有 ... shizo death\\u0027s storehouse tcg

使用do...while(0)的好处 - 知乎 - 知乎专栏

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Do while 宏

Python Do While – Loop Example - FreeCodecamp

WebThe do..while loop is similar to the while loop with one important difference. The body of do...while loop is executed at least once. Only then, the test expression is evaluated. The syntax of the do...while loop is: do { // the body of the loop } while (testExpression); Web在代码中合理使用宏定义可以提高代码的可读性、可维护性和可重用性。 ... do {} while (0) #endif. 这段代码的意思是，如果定义了DEBUG宏，那么就使用printf函数输出调试信息。 …

Do while 宏

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Web4个回答声称这是不可能的。. 包括你的. @EugeneSh。. 我的意思是，他想做的事情可以通过其他方式实现，并且我认为他的概念将是对C预处理程序的不错补充，它将导致某种递归 … WebJan 28, 2014 · 在Linux内核和其它一些著名的C库中有许多使用do{...}while(0)的宏定义。 这种宏的用途是什么？有什么好处？ Google的Robert Love（先前从事Linux内核开发）给 …

WebC 语言中 do...while 循环的语法：. do { statement(s); }while( condition ); 请注意，条件表达式出现在循环的尾部，所以循环中的 statement (s) 会在条件被测试之前至少执行一次。. 如果条件为真，控制流会跳转回上面的 do，然后重新执行循环中的 statement (s)。.

WebThe whole idea of using 'do/while' version is to make a macro which will expand into a regular statement, not into a compound statement. This is done in order to make the use … WebJan 28, 2014 · 在Linux内核和其它一些著名的C库中有许多使用do{...}while(0)的宏定义。 这种宏的用途是什么？有什么好处？ Google的Robert Love（先前从事Linux内核开发）给我们解答如下：. do{...}while(0)在C中是唯一的构造程序， 让你定义的宏总是以相同的方式工作，这样不管怎么使用宏（尤其在没有用大括号包围调用宏 ...

WebAug 31, 2024 · A while loop will always first check the condition before running. If the condition evaluates to True then the loop will run the code within the loop's body. For example, this loop runs as long as number is less than 10: number = 0 while number < 10: print (f"Number is {number}!") number = number + 1. Output:

Web4个回答声称这是不可能的。. 包括你的. @EugeneSh。. 我的意思是，他想做的事情可以通过其他方式实现，并且我认为他的概念将是对C预处理程序的不错补充，它将导致某种递归预处理程序在自己之后传递并最终导致无限循环定义自己的定义的宏的递归，太棒了 ... rabbit acholicWebFeb 21, 2024 · Syntax. do statement while (condition); statement. A statement that is executed at least once and is re-executed each time the condition evaluates to true. To … rabbit abandoned babiesWebThe syntax of a do...while loop in C programming language is −. do { statement (s); } while ( condition ); Notice that the conditional expression appears at the end of the loop, so the … rabbit academy: mission eggpossible streamingWeb在代码中合理使用宏定义可以提高代码的可读性、可维护性和可重用性。 ... do {} while (0) #endif. 这段代码的意思是，如果定义了DEBUG宏，那么就使用printf函数输出调试信息。否则，就使用一个空语句块来忽略这个宏。 rabbit academy 2022 english subtitleWebAug 9, 2016 · 在Linux内核和其它一些著名的C库中有许多使用do{...}while(0)的宏定义。 这种宏的用途是什么？有什么好处？ Google的Robert Love（先前从事Linux内核开发）给 … rabbit academy 2022 online subWebJan 23, 2014 · It isn't possible to write multistatement macros that do the right thing in all situations. You can't make macros behave like functions—without do/while(0). If we … rabbit abscesses on faceWebThe syntax of a do...while loop in C programming language is −. do { statement (s); } while ( condition ); Notice that the conditional expression appears at the end of the loop, so the statement (s) in the loop executes once before the condition is tested. If the condition is true, the flow of control jumps back up to do, and the statement (s ... rabbit academy full movie