View Code of Problem 48

#include<stdio.h>
#include<math.h>
#include<string.h>
int main(int argc, char** argv) {
	
	int n;
	scanf("%d", &n );
	
	double a = 1;
	double b = 2;
	double sum;
	for(int i = 1 ; i <=n ; ++i){
		sum += b/a;
		b = a + b;
		a = b - a;
	}
	
	printf("%.6lf" , sum);
	
	return 0 ;
}