View Code of Problem 48

# include<stdio.h>
int main(void)
{
    int n,i;
    scanf("%d",&n);
    double s[100],a = 2,b = 1,sum = 0,t;
    for(i=0;i<n;++i)
    {
        s[i] = a / b;
        t = a;
        a = a + b;
        b = t;
        sum = sum + s[i];
    }
    printf("%.6lf",sum);
    return 0;
}