实验十四

#include<stdio.h>
int main(void)
{
    int i,j,m,n,denominator,flag;
    double item,sum;
    scanf("%d",&m);
    for(j=0;j<m;j++)
    {     
        scanf("%d",&n);
        for(i=1;i<=n;i++);
        {
            flag=1;
            sum=0.0;
            denominator=1;
            item=flag*1.0/denominator;
            sum=sum+item;
            flag=-flag;
            denominator=denominator+1;
        }
        printf("%.2f\n",sum);
    }
    return 0;
}