View Code of Problem 71

#include <stdio.h>

int main(void)
{
    int i,n;
    double up[1000],down[1000],sum[1000];
    up[1] = 2.0,down[1] = 1.0,sum[1] = 2.0;
    for(i = 2;i < 1000;i++)
    {
        up[i] = down[i - 1] + up[i - 1];
        down[i] = up[i - 1];
        sum[i] = up[i] / down[i] + sum[i - 1];
    }
    while(scanf("%d",&n)!= EOF)
    {
        printf("%.2lf\n",sum[n]);
    }
    return 0;

}