Overloading functions in base and derived classes - C++ Class

C++ examples for Class:Inheritance

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Description

Overloading functions in base and derived classes

Demo Code

#include <iostream>
using namespace std;
#include <process.h>            //for exit()
class Stack// w  w w .j a  v a 2 s .c om
{
   protected:                   //NOTE: can't be private
   enum { MAX = 3 };         //size of stack array
   int st[MAX];              //stack: array of integers
   int top;                  //index to top of stack
   public:
   Stack()                   //constructor
   { top = -1; }
   void push(int var)        //put number on stack
   { st[++top] = var; }
   int pop()                 //take number off stack
   { return st[top--]; }
};
class Stack2 : public Stack
{
   public:
   void push(int var)        //put number on stack
   {
      if(top >= MAX-1)       //error if stack full
         { cout << "\nError: stack is full"; exit(1); }
      Stack::push(var);      //call push() in Stack class
   }
   int pop()                 //take number off stack
   {
      if(top < 0)            //error if stack empty
         { cout << "\nError: stack is empty\n"; exit(1); }
      return Stack::pop();   //call pop() in Stack class
   }
};
int main()
{
   Stack2 s1;
   s1.push(11);                 //push some values onto stack
   s1.push(22);
   s1.push(33);
   cout << endl << s1.pop();    //pop some values from stack
   cout << endl << s1.pop();
   cout << endl << s1.pop();
   cout << endl << s1.pop();    //oops, popped one too many...
   cout << endl;
   return 0;
}

Result


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