Question

The following program is showing error:

#include<conio.h>
#include<iostream.h>
int count = 0;
class alpha
   {
   public:

   alpha()
         {
         count++;
         cout<<"\n Number of objects created "<<count; 
         }
  ~alpha()
         {
         cout<<"\n Number of object destroyed"<<count;
         count--;
         }
  };

int main
{
    cout<<" inside main ";
    alpha a1, a2, a3, a4;
    {
        cout<<"\n Block 1 ";
        alpha A5;
    }
    {
        cout<<"\n Block 2 ";
        alpha a6;
    }
    cout<<" main again ";
    return 0;
}

Line 11: error: reference to ‘count’ is ambiguous compilation terminated due to -Wfatal-errors.

Answer 1

There is no header <iostream.h> in standard C++. Use the header <iostream> which has names in std namespace, thus not polluting the global namespace with names as count.
Don’t forget to use std::cin, std::cout etc. from now on.

If your compiler doesn’t recognize <iostream>, throw it away and get a new one. Visual Studio Express, for one, is free and easy to use, though not extremely standards-compliant at the moment, but that should not be a big issue for you.