字符串化运营 [英] Stringizing operator

问题描述

如何以下code编译正确，

How does the following code compile correctly,

#include <stdio.h>
#define stringer( x ) printf_s( #x "\n" )
int main() {
stringer( "In quotes when printed to the screen" );   
}

是不是应该得到扩展成

isn't it supposed to get expanded into

printf_s(""In quotes when printed to the screen""\n");

这是一个错误，因为在printf_s嵌套双引号??

which is an error as there are nested double quotes in printf_s??

推荐答案

没有，在＃运营商处理字符串字面量特别。在一个字符串文字传递给它，它必须 \\ 逃脱每个正确的扩展：

No, the # operator handles character string literals specially. It must \ escape each " in a character string literal that is passed to it. The correct expansion is:

printf_s( "\"In quotes when printed to the screen\"" "\n" );

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