安大复试上机题

#include<stdio.h>
#include<string.h>

int main(){
    int i=1;
    double n=1;
    double sum=1;
    while(n>0.00001){
        n=(1.0)/(2*i+1);
        if(i%2==0)
            sum=sum+n;
        else 
            sum=sum-n;
        i++;
    }
    printf("%lf",sum);
}