计算1/1-1/2+1/3-1/4+1/5 …… + 1/99

#include<stdio.h>#include<stdlib.h>int main(){    int i=0;    double add=0.0;    for(i=1;i<100;i+=2)    {        add=add+(double)1/(i*(i+1));    }    printf("add=%f\n",add);    system("pause");    return 0;}