Stack.cpp

#include<iostream>
#define maxsize 10
using namespace std;

class Stack
{
    int top;
    int a[maxsize];
public:
    Stack();
    bool isfull();
    bool isempty();
    void push(int x);
    void pop();
    void display();
    void Top();
    void Size();
};

Stack::Stack()    //initialize the top of Stack to 0 using default like constructor
    {
        top=0;
    }

bool Stack::isfull()    //if the top of stack is equal to thr maximum element allowed in stack, its full in size and cant push elements
    {
        if(top==maxsize)
            return true;
        else
            return false;
    }

bool Stack::isempty()   //if the top of stack is 0, its empty and nothing to pop from stack
    {
        if(top==0)
            return true;
        else
            return false;
    }

void Stack::push(int x)
{
    if(isfull())
    {
        cout<<"Stack is full"<<endl;
        return;
    }
    else
    a[top]=x;   //if stack is not full, element is pushed into stack at the top index of stack array
    top++;
}

void Stack::pop()
{
    if(isempty())
    {
        cout<<"nothing in list"<<endl;
        return;
    }
    else
        top--;   //if stack is not empty (when top is not equal to zero) element can be poped out of stack(element can be removed from the top index of stack)
        cout<<"pops "<<a[top]<<endl;
}

void Stack::display()   //displays the elements of the stack
    {
        int i;
        if(top==0)    
        {
            cout<<"nothing to display"<<endl;
        }
        else
        cout<<"Displaying"<<endl;
        for(i=0;i<top;i++)
        {
            cout<<a[i]<<endl;
        }
    }

void Stack::Top()   //displays the top most element in the array of stack
{
    cout<<"top is "<<a[top-1]<<endl;
}

void Stack::Size()    //displays the size of stack
{
    cout<<"size of Stack is "<<top<<endl;
}

int main()
{
    Stack s;
    int ch,element,result;
    while(1)
    {
        cout<<"*--------------------------------------------------------------------*"<<endl;
        cout<<"1.PUSH  2.POP  3.DISPLAY  4.ISFULL  5.ISEMPTY  6.TOP  7.SIZE  8.EXIT "<<endl;
        cout<<"*--------------------------------------------------------------------*"<<endl;
    cin>>ch;
    if(ch==1)
    {
        cout<<"enter element ";
        cin>>element;
        s.push(element);
    }
    else if(ch==2)
    {
        s.pop();
    }
    else if(ch==3)
    {
        s.display();
    }
    else if(ch==4)
    {
        if(s.isfull())
            cout<<"STACK IS FULL"<<endl;
        else
            cout<<"STACK IS NOT FULL"<<endl<<"YOU CAN PUSH"<<endl;
    }
    else if(ch==5)
    {
        if(s.isempty())
            cout<<"STACK IS EMPTY"<<endl;
        else
            cout<<"STACK IS NOT EMPTY"<<endl<<"YOU CAN POP"<<endl;
    }
    else if(ch==6)
    {
        s.Top();
    }
    else if(ch==7)
    {
        s.Size();
    }
    else
    return 0;
    }
    return 0;
}