View Code of Problem 71

#include<stdio.h>
int main()
{
  int i,n;
  double t,a=2.0,b=1.0,av,sum=0.0;
  scanf("%d",&n);
  for(i=0;i<n;i++)
  {
    av=a/b;
    sum+=av;
    t=a;
    a=a+b;
    b=t;
  }
  printf("%.2f",sum);
  return 0;
}

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