为什么这个嵌套的 printf 语句打印“5 53”？

Question

#include <stdio.h>

int main() {
    int x=5;
    printf("%d", printf("%d %d",x,x));
}

How is the output 5 53 can someone explain ? I tried myself and I think the answer should be 5 5 2

Answer 1

The return value of printf is the

number of characters transmitted to the output stream or negative value if an output error or an encoding error (for string and character conversion specifiers) occurred

(from here , emphasis mine) and "5 5" are three characters (namely "five space five"). So the last number printed is 3.