View Code of Problem 48

#include<stdio.h>
int main()
{
  double a=1.0,b=2.0,t,sum=0.0;
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;i++){
      sum+=b/a;
      t=a;
      a=b;
      b=b+t;
  }
  printf("%.6f",sum);
   return 0;
}