编辑代码

#include <stdio.h>
int main()
{
    int i, n;
    int f=1;
    double sum;            
    sum = 0.0;
    for(i=1; i<=n; i++)
    {
        sum+=1.0*f/i;
        f*=(-1);           
    }
    printf("1-1/2+1/3-1/4+ ... +-1/100 = %lf", sum);
}