View Code of Problem 48

#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    double a=1.00,b=2.00,t,sum=0.00,x;
    for(int i=0;i<n;i++){
        sum=sum+b/a;
        t=b;
        b=a+b;
        a=t;

    }
    printf("%.6f\n",sum);
}