Editing Do while loop (section)

===C, C++, D===
{{Further|C (programming language)|C++|D (programming language)}}
<syntaxhighlight lang="c++">
int counter = 5;
int factorial = 1;

do {
    factorial *= counter--; // Multiply, then decrement.
} while (counter > 0);

std::println("factorial of 5 is {}", factorial);
</syntaxhighlight>

Do-while(0) statements are also commonly used in C macros as a way to wrap multiple statements into a regular (as opposed to compound) statement. It makes a semicolon needed after the macro, providing a more function-like appearance for simple parsers and programmers as well as avoiding the scoping problem with {{code|if}}. It is recommended in [[CERT C Coding Standard]] rule PRE10-C.<ref>{{cite web |title=C multi-line macro: do/while(0) vs scope block |url=https://stackoverflow.com/a/1067238 |website=Stack Overflow}}</ref>