C++ program for Stack

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Stack 

A stack is a container of objects that are inserted and removed according to the last-in first-out (LIFO) principle.

In the stacks only two operations are allowed:
  • push the item into the stack, and 
  • pop the item out of the stack. 
A stack is a limited access data structure - elements can be added and removed from the stack only at the top.
Push adds an item to the top of the stack,
Pop removes the item from the top.
A helpful analogy is to think of a stack of books; you can remove only the top book, also you can add a new book on the top.

Program:

#include<iostream>
#include<stdlib.h>
using namespace std;
int siz,del;
void push(int stack[],int n,int &top)
{
    if(top==siz)
      {
      cout<<"Overflow ";
      exit(0);      }
    else
    {
        top++;
        stack[top]=n;
        }
}
void pop(int stack[],int &top)
{
    if(top==0)
    {
       cout<<"Underflow";
       exit(0);}
    else
    {
        del=stack[top];
        top--;
    }


}
void display(int stack[],int top)
{for(int i=top;i>=1;i--)
   cout<<"\n"<<stack[i];
}
main()
{   cout<<"Enter size of STACK";
    cin>>siz;
    int top=0,val,flag,c;
    char ch;
    int stack[siz];
    do{
    cout<<"Enter the value to create stack ";
    cin>>val;
    push(stack,val,top);
    cout<<"The stack is ";
    display(stack,top);
    cout<<"\nWant to insert more ";
    cin>>ch;
            }while(ch=='y'||ch=='Y');
    cout<<"Enter your choice \n1.Push \n2.Pop \nChoice: ";
    cin>>c;
    switch(c)
    {

        case 1:do{
    cout<<"-----Inserting element ----- \nEnter the value for insertion ";
    cin>>val;
    push(stack,val,top);
    cout<<"The stack is ";
    display(stack,top);
    cout<<"\nWant to insert more ";
    cin>>ch;
            }while(ch=='y'||ch=='Y');
            break;
    case 2:
        cout<<"\n-------Deleting top element------ ";
    do{
        pop(stack,top);
        cout<<"\n\nDeleted element is "<<del;
        cout<<"\nThe stack is ";
    display(stack,top);
    cout<<"\nWant to delete more ";
    cin>>ch;
    }while(ch=='y'||ch=='Y');
break;}
}

Output of the program:

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