浙大版《C语言程序设计（第3版）》题目集 练习5-1 求m到n之和 (10分)

#include <stdio.h>
int sum(int m, int n);
int main()
{
    int m, n;

    scanf("%d %d", &m, &n);
    printf("sum = %d\n", sum(m, n));
    return 0;
}
int sum(int m, int n)
{
    int i, sum;
    sum = 0;
    for (i = m; i <= n; i++)
        sum += i;
    return sum;
}