求整数段和怎么写？？

#include <stdio.h>
int main()
{
    int A,B;
    int sum = 0,i,cnt = 0;;
    scanf("%d %d",&A,&B);
    for (i=A;i<=B;i++)
    {
        cnt++;
        sum += i;
        printf("%5d",i);
        if(cnt%5 == 0)
            printf("\n");
    }
    printf("\nSum = %d",sum);
    return 0;
}