为什么printf会在我的程序中输出？

Question

#include<stdio.h>

int main()
{
    printf("%d",printf("%d %d",2,2) & printf("%d %d",2,2));
}

输出如下: 2 2 2 2 3

我无法弄清楚为什么输出是这样的.有任何想法吗？

Answer 1

printf 返回打印的字符数,所以这里是解释:

printf("%d",printf("%d %d",2,2) & printf("%d %d",2,2));
\_________/ \_________________/ | \_________________/
     |              |           |          |
     |         prints "2 2"     |    prints "2 2"
     |         and returns 3    |    and returns 3
     |                          |
     |                    computes 3 & 3
     |                   (which equals 3)
     |
 prints "3"