View Code of Problem 48

#include<stdio.h>
int main()
{
	int n,i;
	double sum=0,son=1.000000,mom=2.000000,tempmom;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		sum=sum+(mom/son);
		tempmom=mom;
		mom=son+mom;
		son=tempmom;
	}
	printf("%.6lf",sum);
	return 0;
}