View Code of Problem 48

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