// 3) WAP to implement Stack
#include <iostream>
using namespace std;
const int StackSpace=4;
int top=-1;
int Stack[StackSpace];

void push(int data){
    if(top==(StackSpace-1)){
        cout<<"Stack over flowed!!!"<<endl;
        return ;
    }
    Stack[++top] = data;
}

void pop(){
    if(top==-1){
        cout<<"Stack under flowed!!!"<<endl;
        return ;
    }
    top--;
}

void peek(){
    if(top==-1){
        cout<<"Stack is empty!!!"<<endl;
        return ;
    }
    cout<<"Current top element of stack: "<<Stack[top]<<endl;
}

void size(){
    cout<<"Current stack size: "<<top+1<<endl;
}

void printStack(){
    cout<<"Current stack elements:"<<endl;
    for(int i=top;i>=0;i--){
        cout<<Stack[i]<<endl;
    }
}
int main(){
    

    push(10);
    push(20);
    push(30);
    push(40);
    peek();
    size();
    printStack();
    pop();
    peek();
    size();
    printStack();
    
    return 0;
}
/*
    OUTPUT:

    Current top element of stack: 40
    Current stack size: 4
    Current stack elements:
    40
    30
    20
    10
    Current top element of stack: 30
    Current stack size: 3
    Current stack elements:
    30
    20
    10
*/