习题2-3 求平方与倒数序列的部分和

#include<stdio.h>
int main()
{
    int i, m, n;
    double sum, item;
    
    scanf("%d %d", &m, &n);
    sum = 0;
    for(i=m; i<=n; i++){
        item = i*i+1.0/i;
        sum = sum+item;
    }
    printf("sum = %.6f", sum);
    
    return 0;
}