Stack using Array

#include<iostream>
using namespace std;
#define max 5
int a[max];
int top=-1;
int input;

void push()
{
 if(top==max-1)
 {
  cout<<"stack is overflow"<<endl;
 }
 else
 {
  cout<<"Enter the Element in the Stack"<<endl;
  cin>>input;
  top=top+1;
  a[top]=input;
 }
 }

void pop()
{
 if(top==-1)
 {
 cout<<"Stack is Empty"<<endl;
 }
 else
 {
 cout<<"Stack value : "<<a[top]<<endl;
 top=top-1;
 }
}

void display()
{
if(top==-1)
 {
 cout<<"Stack is Empty"<<endl;
 }
 else
 {for(int i=top; i>=0; i--)
 {
  cout<<"Stack["<<i<<"] : "<<a[i]<<endl;
 }
 }
}

int main()
{
int select;
char again;
do{
  cout<<"***** 1.PUSH ****"<<endl;
  cout<<"***** 2.POP ****"<<endl;
  cout<<"***** 3.Display ****"<<endl;
  cout<<"Select the option"<<endl;
  cin>>select;
switch(select)
 {
 case 1:push();break;
 case 2:pop(); break;
 case 3:display();break;
 default : cout<<"Wrong input"<<endl;
}
cout<<"Do You Want Again(Y/N)"<<endl;
cin>>again;
}while(again=='y'||again=='Y');
}


Output :