View Code of Problem 71

#include<stdio.h>
int main()
{
	int n,i,j,a[21],b[21];
	double c[21];
	double sum=0.0;
	scanf("%d",&n);
	a[0]=2,a[1]=3;
	b[0]=1,b[1]=2;
	for(i=2;i<n;i++)
	{a[i]=a[i-1]+a[i-2];
	b[i]=b[i-1]+b[i-2];
} 
	for(i=0;i<n;i++){
		c[i]=(double)a[i]/b[i];
		sum+=c[i];}
	printf("%.2lf",sum);
}