View Code of Problem 71

#include<stdio.h> 
#include<string.h>
#include<math.h>
int main(){ 
    int n,a=1,b=2;
	float sum=0;
	scanf("%d",&n);
    for(int i=0;i<n;i++){
    	sum+=1.0*b/a;
    	int t=a;
    	a=b;
    	b=t+b;
    	
	}
	printf("%.2f",sum);
    return 0; 
     
}