Do while 宏
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 WebJul 5, 2014 · 参考:do{}while(0)只执行一次无意义?你可能真的没理解. 在嵌入式开发中,宏定义非常强大也非常便捷,如果正确使用可以让你的工作事半功倍。然而,在很多的C程 …
Do while 宏
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WebMar 29, 2024 · Remarks. Any number of Exit Do statements may be placed anywhere in the Do…Loop as an alternate way to exit a Do…Loop. Exit Do is often used after evaluating some condition, for example, If…Then, in which case the Exit Do statement transfers control to the statement immediately following the Loop.. When used within nested Do…Loop … WebAug 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 …
Web语法. C++ 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 … 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)。.
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。否则,就使用一个空语句块来忽略这个宏。 WebJan 17, 2024 · 在嵌入式开发的过程中,我们经常可以看到在一些优秀开源代码的头文件里发现一些宏定义使用了do{}while(0)语句,也许你会疑惑do{}while(0)不就是只执行一次 …
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 …
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 ... burn healthWebThe 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); burn healing processWebMar 29, 2024 · Remarks. Any number of Exit Do statements may be placed anywhere in the Do…Loop as an alternate way to exit a Do…Loop. Exit Do is often used after evaluating … burnheartmadeWebJun 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. … hamburger franchisesWebFeb 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 … hamburger freezer containersWebJan 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 … hamburger food trucks dallasWebFeb 19, 2014 · 宏的简单应用很容易掌握,今天主要总结一下宏的特殊符号及惯用法。. (1)宏中包含特殊符号:#、##. (2)宏定义用do { }while (0) 2、特殊符号#、##. … hamburger franchises usa