快速求和，求c语言pta程序.

Question

Answer 1

#include <stdio.h>
int main()
{
    double s = 0;
    int i,n;
    scanf("%d",&n);
    for (i=1;i<=n;i++)
    {
        s += 1.0/(i*(i+1));
    }
    printf("%.5lf",s);
    return 0;
}