WebA declaração do...while cria um laço que executa uma declaração até que o teste da condição for falsa (false). A condição é avaliada depois que o bloco de código é executado, resultando que uma declaração seja executada pelo menos uma vez. 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次，就像没有循环语句一样。. 总结：在Linux和其它代码库里的，很多宏实现都使用do/while (0)来包裹他们的逻辑，这样不管在调用代码中怎么使用分号和大括号，而该宏总能确保其行 …

C/C++编程笔记：C语言中while（1）和while（0）之间的区别

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. reagan vs bush foreign policy

do{ }while(0)的好处？ - 知乎

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 … WebMay 12, 2024 · do-while循环的一般语轴只游底法是：do{，语句，}while(条件)。示例1 ：编写一个猜数游戏，要 求猜一个介于1—10之间的数字，根据用户猜测的数与标准值进行对比，并给出提示，以便下次猜测能接近标准值，直到猜中为止。 注意：在do-whil 句 e语句的表达式后面必看缩样敌又先车六班钱术须加分号。 WebThe purpose of do{ ... } while(0) construct is to turn a group of statements into a single compound statement that can be terminated with a ;.You see, in C language the do/while construct has one weird and unusual property: even though it "works" as a compound statement, it expects a ; at the end. No other compound constructs in C have this … reagan was president what year