View Code of Problem 71

#include<stdio.h>
int main()
{
  int n,i,a=2,b=1;
  double sum=0.0,c;
  scanf("%d",&n);
  for(i=1;i<=n;i++)
  {
    c=a/b;
    sum+=c;
    b=a;
    a=d;
    a+=b;
  }
  printf("%.2lf",sum);
  return 0;
}
/*
Main.c: In function 'main':
Main.c:12:7: error: 'd' undeclared (first use in this function)
     a=d;
       ^
Main.c:12:7: note: each undeclared identifier is reported only once for each function it appears in
*/