View Code of Problem 48

#include<stdio.h> 
#include<string.h>
#include<math.h>

int main(){ 
    int n,a=1,b=2,k;
    double sum=0;
    scanf("%d",&n);
    for(int i=0;i<n;i++){
    	sum+=1.0*b/a;
    	k=a;
    	a=b;
    	b=k+b;
    	
	}
	printf("%.6lf",sum);
    return 0; 
     
}