View Code of Problem 48

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

}