解释C代码片段:预处理器+ printf =？

Question

此代码段的输出是%s is a string is a string.请解释.

#include <stdio.h>

#define scanf "%s is a string"

int main()
{
    printf(scanf, scanf);  
}

Answer 1

您希望我们究竟解释什么？包含宏并获得

printf("%s is a string", "%s is a string");

其余的是预期的正常日常行为printf.

PS #define scanf ...???