View Code of Problem 71

#include<stdio.h>
#include <string.h>
int main(){
	double a,b,temp;
	double c[101]={0};
	double sum=0;
	int i;
	a=2.0;
	b=1.0;
	int n;
	scanf("%d",&n);
	for(i=1;i<101;i++){
		c[i]=a/b;
		temp=a;
		a=a+b;
		b=temp;
		
	}
	for(i=1;i<=n;i++){
		sum +=c[i];
	}
	printf("%.2f",sum);
	
	printf("\n");
	return 0;
}