// Stack through array


Program to implement Pop and Push operations in Stack (stack is implemented using Array)

#include<iostream.h>
#include<conio.h>
#include<process.h>                          // to use exit() function

# define size 20                                 //for array size

int stack[size], top=-1, data;

void push()
{
     if(top < size-1)
     {
        cout<<"\n Enter data for push operation... : ";
        cin>>data;
        top+=1;                                   //same as top = top + 1
        stack[top] = data;
     }
     else
     cout<<"\n\tStack full....\n\tTry emptying values from stack...";
}

void pop()
{
    if(top = = -1)
    cout<<"\n\t Stack underflow...\n\t Try pushing elements...";
    else
    {
    data = stack[top];
    cout<<"\n\t Popped data : "<<data;
    top-=1;
    }
}

void display()
{
     for(int i=0; i<= top; ++i)
     cout<<stack[i]<<" --> ";
    
     cout<<"\n\n   Press enter to continue";
     getch();
}

int main()
{

    int choice;

    do
    {
    clrscr();
    cout<<"\n\n\n\t Welcome to Stack menu";
    cout<<"\n  Press 1 to push elements in stack";
    cout<<"\n  Press 2 to pop elements from stack";
    cout<<"\n  Press 3 to exit";
    cout<<"\n    Stack current status...: "<<top+1<<" elements present\n\n";
    cout<<"\n\n  Enter your choice (1-3)  : ";
    cin>>choice;

    switch(choice)
    {
                       case 1:
                            push();
                            display();
                          break;
                         
                       case 2:
                            pop();
                            display();
                          break;
                          
                       case 3:
                             cout<<"\n   Preparing to exit...";
                             cout<<"\n   Press enter...";
                             getch();
                             exit(0);
                          break; 
                         
                       default:
                             cout<<"\n\t Wrong selection!!! Remember (1-3)";
                          break;   
        }
     }while(choice != 3);
     getch();
    
     return 0;

}

Sample Output of the program: