计算1/1-1/2+1/3-1/4+1/5 …… + 1/99

#include<stdio.h>int main(){    int i = 0;    double sum = 0;    for (i = 1; i <= 100; i++)                        {         if(i%2==1)            //判断i是奇数还是偶数           sum = sum + 1.0 / (double)i;             else           sum = sum +(- 1.0 / (double))i;    }    printf("结果：%lf\n", sum);    system("pause");    return 0; }