What will be the output and why??

Question

#include <stdio.h>
void main()
{
int x = 4;
int *p = &x;
int *k = p++;
int r = p - k;
printf("%d", r);
}

Answer 1

The answer will be 1 because of the difference between two pointers gives us the distance between the two(in simple words) in terms of value not bytes.