најголема разлика

#include<stdio.h>
#include <stdlib.h>
int main()
{
    int n,a,b, i;
    float sum = 0, x;

    printf("Enter number of elements:  ");
    scanf("%d", &n);
    printf("\n\n\nEnter %d elements\n\n", n);
    int max = 0;
    for(i = 0; i < n; i++)
    {
        scanf("%d%d", &a, &b);
        if(a > b)
        {
            sum = a - b;
        }
        else sum = b-a;
        if(sum > max)
        {
            max = sum;
        }
    }

    printf(" %d", max);
    return 0;
}