View Code of Problem 71

#include <stdio.h>
#include <stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>
int main()
{

	int a[100] = { 1,2 };
	int i, n;
	for (i = 2; i < 100; i++)
	{
		a[i] = a[i - 1] + a[i - 2];
	}
	scanf("%d",&n);
	double x=0;
	
	for (i = 1; i <= n; i++)
	{
		x += (double)a[i] / a[i - 1];
	}
	printf("%.2lf\n", x);
	return 0;
}