Can you add or subtract two pointers?

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
    long long a = 15;
    long long b = 20;
    long long c[] = { 1, 2, 3 };
    
    long long* p = malloc(sizeof(long long));
    long long* q = malloc(sizeof(long long));
    
    long long result = p - q;
    printf("Result is %lld with address %p and %p\n", result, p, q);
    
    return 0;
}