Stack operations cpp program

Program to implement the stack as an array

#include<iostream.h>

#include<conio.h>

#include<stdlib.h>

class IntStack

{ private:

          int *stackarr,stacksize,top;

  public:

          IntStack(int);

          void push(int);

          void pop(void);

          void display(void);

          int isfull();

          int isempty();

          int gettop()

          {return(top);}

};

IntStack:: IntStack(int size)

{        stackarr=new int[size];

          stacksize=size;

           top=-1;

}

void IntStack::push(int num)

{        if(isfull())

                   cout<<"\nThe stack is full.Can`t  push more elements";

          else

          {        top++;

                    stackarr[top]=num;

          }

          return;

}

void IntStack::pop(void)

{        if(isempty())

                   cout<<"\n The stack is empty .No elements to pop";

          else

          {        cout<<stackarr[top];

                    top--;

          }

  return;

}

void IntStack::display(void)

{        for(int i=top;i>-1;i--)

                   cout<<stackarr[i]<<" ";

          return;

}

int IntStack::isfull()

{        if(top==(stacksize-1))

                   return 1;

          else

                   return 0;

}

int IntStack::isempty()

{        if(top==-1)

                   return 1;

          else

                   return 0;

}

void main()

{        int c,num;

          char ch;

          IntStack stack(20);

          while(1)

          {        clrscr();

                   cout<<"\nPerform the following stack operations";

                   cout<<"\n-------------------------------";

                   cout<<"\n1.Push elements";

                   cout<<"\n2.Pop elements";

                   cout<<"\n3.Display full stack content";

                   cout<<"\n4.Exit from the program";

                   do

                    {        cout<<"\nSelect your choice(1:4)";

                             cin>>c;

                             cout<<"";

                    }

                   while((c<1)||(c>4));

          if(c==4)exit(1);

          clrscr();

          switch(c)

          { case 1 :    

                   do

{        cout<<"Stack currently has " <<stack.gettop()+1<<" elements\n";

                             cout<<"Enter the new element : ";

                             cin>>num;

                             stack.push(num);

                             cout<<"Push more(Y/N) : ";

                             cin>>ch;

                   }

                   while((ch=='y')||(ch=='Y'));

                   break;

          case 2 :

                   do

{        cout<<"Stack currently has " <<stack.gettop()+1<<" elements\n";

                             if(stack.gettop()!=-1) cout<<"The poped element is : ";

                             stack.pop();

                             cout<<"\nPop more (Y/N) : ";

                             cin>>ch;

                   }

                   while((ch=='y')||(ch=='Y'));

                   break;

          case 3 :

cout<<"Stack currently has " <<stack.gettop()+1<<" elements as shown below \n";

                   stack.display();

                   break;

          }

          cout<<"\nPress any key to continue............";

          getch();

      }

}