C-分数求和

#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>
#include<math.h>
int main()
{
    //分数求和 1/1-1/2+1/3-1/4+1/5......+1/99-1/100的值，打印出结果
    int i = 0;
    double sum = 0.0;
    int flag = 1;
    for (i = 1; i <= 100; i++)
    {
        sum += flag * 1.0 / i;
        flag = -flag;
    }
    printf("%lf\n", sum);

    return 0;
}