View Code of Problem 71

#include<stdio.h>
int main()
{
	double z=2;
	double m=1;
	double sum=0.0;
	int n;
	double t;
	double s;
	scanf("%d",&n);
	for(int i=0;i<n;i++)
	{
		s=z/m;
		sum+=s;
		t=z;
		z=z+m;
		m=t;
	}
	printf("%.2f\n",sum);
	return 0;
}