程序代码：

#include<stdio.h>
int main()
{
    int sign,sum,deno,term;
    sign=1;
    sum=1;
    deno=2;
    while(deno<=100)
    {
        sign=(-1)*sign;
        term=sign*(1/deno);
        sum=sum+term;
        deno=deno++;
       
    }
    printf("%f\n",sum);
}