Logic please ?

Question

#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
int x = 25;
printf("%d ", printf("%d ", x));
return 0;
}

Output
25 3

Can anyone please explain me ?

Answer 1

On success,printf return the total number of characters written.
your code print x then print what the inner printf returned.

Answer 2

Thank You so much for help and let me the knowledge logic behind it.