stack_using_array.cpp

#include <bits/stdc++.h>
using namespace std;

class MyStack
{
    public:
    int *arr;
    int cap;
    int top;
    MyStack(int c)
    {
        cap=c;
        arr=new int [cap];
        top=-1;
    }
    
    void push(int x){
        if(top==cap-1){cout<<"Stack is full"<<endl;return;}
        top++;
        arr[top]=x;
    }
    
    int pop(){
        if(top==-1){cout<<"Stack is Empty"<<endl;return INT_MIN;}
        int res=arr[top];
        top--;
        return res;
    }
    
    int peek(){
        if(top==-1){cout<<"Stack is Empty"<<endl;return INT_MIN;}
        return arr[top];
    }
    
    int size(){
        return (top+1);
    }
    
    bool isEmpty(){
        return top==-1;
    }
};

int main()
{
    MyStack s(5);
    s.push(5);
    s.push(10);
    s.push(20);
    cout<<s.pop()<<endl;
    cout<<s.size()<<endl;
    cout<<s.peek()<<endl;
    cout<<s.isEmpty()<<endl;
  
    return 0; 
}