View Code of Problem 71

#include <stdio.h>
int main()
{
	int a[50] = { 2,3 }, b[50] = { 1,2 };
	float sum = 0;
	int n;
	scanf("%d", &n);
	if (n == 1)
		sum += a[0] / (b[0] * 1.0);
	else if (n == 2)
		sum = a[0] / (b[0] * 1.0) + a[1] / (b[1] * 1.0);
	else
	{
		sum = a[0] / (b[0] * 1.0) + a[1] / (b[1] * 1.0);
		for (int i = 2; i < n; i++)
		{
			a[i] = a[i - 1] + a[i - 2];
			b[i] = b[i - 1] + b[i - 2];
			sum += a[i] / (b[i] * 1.0);
		}
	}
		
	printf("%.2f\n", sum);
	return 0;
}