[207Lec2] STACK with ARRAY

#include <iostream>
using namespace std;

int size;
int Top = -1;
int stk[1000];

bool isEmpty() {
    return Top == -1 ? true : false;
}

bool isFull() {
    return Top == size - 1 ? true : false;
}

void top() {
    if (isEmpty())
        cout << "Stack is Empty" << endl;
    else
        cout << "TOP: " << stk[Top] << endl;
}

void pop() {
    if (isEmpty())
        cout << "Stack is Already Empty" << endl;
    else {
        Top--;
        cout << "Success" << endl;
    }
}

void push(int x) {
    if (isFull())
        cout << "Overflow" << endl;
    else {
        stk[++Top] = x;
        cout << "Success" << endl;
    }
}

void show() {
    if (isEmpty()) {
        cout << "Stack is Empty" << endl;
        return;
    }

    for (int i = 0; i <= Top; i++)
        cout << stk[i] << " ";
    cout << endl;
}


int main(){
    int choice, value;
    cout << "Enter the Maximum Size of the Stack: ";
    cin >> size;

    while (true) {
        cout << endl;
        cout << "---Press 1 - for LIST" << endl;
        cout << "---Press 2 - for TOP" << endl;
        cout << "---Press 3 - for PUSH" << endl;
        cout << "---Press 4 - for POP" << endl;
        cout << "---Press 5 - for Checking if Empty" << endl;
        cout << "---Press 6 - for Checking if Full" << endl;
        cout << "---Press 0 - Exit" << endl;
        cout << endl;
        cout << "---Enter your Choice: ";
        cin >> choice;
        cout << endl;

        switch (choice) {
            case 1: {
                show();
                break;
            }
            case 2: {
                top();
                break;
            }
            case 3: {
                cout << "Enter Value to Push: ";
                cin >> value;
                push(value);
                break;
            }
            case 4: {
                pop();
                break;
            }
            case 5: {
                isEmpty() ? cout << "Stack is Empty" << endl : cout << "Stack is NOT Empty" << endl;
                break;
            }
            case 6: {
                isFull() ? cout << "Stack is Full" << endl : cout << "Stack is NOT Full" << endl;
                break;
            }
            case 0: {
                return 0;
            }
            default: {
                cout << "Invalid Input. Try Again." << endl;
                continue;
            }
        }
    }
    return 0;
}