linux - A classic question about printf in C language

Question

The following program, what is the output result?

#include <stdio.h>
int main() {
    int i = 43;
    printf("%d\n",printf("%d",printf("%d",i)));
    return 0;
}

Original series source: Several classic interview questions in C language under Linux

Answer 1

The answer is 43 2 1
Explanation: printf("%d", i) has a return value and returns the number of outputs
The above code can be converted to:

int i = 43;
a = printf("%d", i) # output: 43
b = printf("%d", a) # output: 2
printf("%d", b) # output: 1