Question

Given long long int x, y;, I want a function that can compare x & y and returns T/F Flag, which is a normal int 32-bit. I tried this, but it confused me

#include <stdio.h>
int main() {
 long long n,i;

 scanf("%l64d", &n);
 i=42;

 printf("%l64d", n);
 printf("%l64d", i);
 printf("\ni<=n --> %d\n",i<=n);
 return;

}

Answer 1

Maybe what you are seeking is exemplified by this (which returns true/1 or false/0 depending on whether x is greater than (gt) y):

int ll_compare_gt(long long x, long long y)
{
    return(x > y);
}

Repeat for the other comparisons…

Arithmetic is more problematic – often, the result of adding two long long values is too big to fit into a 32-bit int.

However, your question is very sketchy on details and this might be quite wide of the mark. You should explain what you really want much more clearly.