View Code of Problem 48

#include <stdio.h>
#include <string.h>
int main()
{
	int n,i;
	double sum = 0,fenzi = 2,fenmu = 1,t;
	scanf("%d",&n);
	for(i = 0;i < n;i++)
	{
		sum += fenzi/fenmu;
		t = fenzi;
		fenzi += fenmu;
		fenmu = t; 
	}
	printf("%f",sum);
	return 0;	
}