View Code of Problem 71

#include<stdio.h>
main(){
	int n;
	float sum=0,i,a=2.0,b=1,t;
	scanf("%d",&n);
	for(i =0;i<n;i++){
		sum += a/b;
		t =a;
		a =a+b;
		b =t;
	}
	printf("%.2f",sum);
	return 0;
}