Do while 0 语句的用法
Web注意,do-while 循环必须在测试表达式的右括号后用分号终止。. 除了外观形式, do-while 循环和 while 循环之间的区别是 do-while 是一个后测试循环,这意味着在循环结束时,也就是在每次迭代完成后,才测试其表达式 … http://c.biancheng.net/view/181.html
Do while 0 语句的用法
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WebFeb 14, 2024 · 0、引言 我们在嵌入式开发的过程中,经常可以碰到在一些宏定义或者是代码段中使用了do {...} while(0)的语句,从语义上理解,do {...} while(0)内的逻辑就只执行一次,并没有循环执行,粗略看来,似乎画蛇添足了,那么为什么还需要在只执行一次的逻辑外面加上一层do {...} while(0)语句呢? WebMar 14, 2024 · java中do while循环的用法. do while循环是一种循环结构,它先执行循环体中的语句,然后再判断循环条件是否成立,如果成立则继续执行循环体,否则退出循环。. 与while循环不同的是,do while循环至少会执行一次循环体。. 其语法格式为:. 其中,循环条 …
WebApr 11, 2024 · 和while循环一样,do-while循环中“表达式”的计算结果一定是布尔型的 TRUE 或 FALSE,如果是其他类型的值也会自动转换为布尔类型的值。 do-while语句最后的分号 ; 是无法省略的(一定要有),它是do while循环语法的一部分。
WebMay 7, 2024 · do能确保大括号里的逻辑能被执行,而while (0)能确保该逻辑只被执行一 … WebJan 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 redefine the macro with do{...}while(0), we will see: #define foo(x) do { bar(x); baz(x); } while (0) Now, this statement is functionally equivalent to the former.
WebMay 6, 2013 · Agree with Thorsten its not a duplicate. So the main reason to use this is to …
WebMar 13, 2024 · do while 循环语句是一种先执行循环体再判断条件的循环结构,即无论条件是否成立,循环体至少会被执行一次。其语法格式为: do { 循环体语句; } while (条件表达式); 在每次循环结束后,都会先执行一次条件表达式的判断,如果条件成立,则继续执行循环体 … jcg firearmsWeb在Lwip中,会经常看到宏定义do{...}while(0)的结构。如上示例可以看出,使用宏替换多条 … jcg footprints llcWebSep 22, 2010 · 3. IIRC the use of the do-while in macros is to make them look more like a normal function invocation; there are some subtle syntax issues around unbraced if statements and things like that. Without the do-while the macro might look like a normal function invocation but would work differently. lutheran church port st lucieWebApr 9, 2024 · CSDN问答为您找到do while语句,求解答相关问题答案,如果想了解更多关于do while语句,求解答 c++、c语言 技术问题等相关问答,请访问CSDN问答。 ... 好问题 0 提建议 追加酬金 关注问题 分享. 邀请回答 ... jcg allstarsportsaccs.comWeb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 … jcg farms of alabamaWebApr 22, 2010 · It seems the do while(0) is still redundant and could be accomplished with a set of curly braces as shown in the above code. The semicolon is the only reason for the while that I can see. – Billy ONeal. Apr 22, 2010 at 1:47 @Jason how would debugging … lutheran church port washington wiWebFeb 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 execute multiple statements within the loop, use a block statement ( { /* ... */ }) to group those statements. condition. jcg foods of georgia