Implementation of Stack in C++ by abstract data type using dynamic array in C++ with the help of classes

Stack-using-array.cpp

#include <iostream>
using namespace std;

template<typename T>
class StackByArray
{
private:
	int top;
	int max_size;
	T* array;
public:
	//1
	StackByArray()
	{
		top = -1;
		max_size = 10;
		array = new T[max_size];
	}
	//2
	bool IsEmpty()
	{
		if (top == -1) { return true; }
		else
		return false;
	}
	//3
	bool IsFull()
	{
		if (top == max_size - 1) { return true; }
		else
		return false;
	}
	//4
	void push(T num)
	{
		if (IsFull())
		{
			cout << "\nError! Stack Overflow\n";
			return;
		}
		else
		{
			top++;
			array[top] = num;
		}
	}
	//5
	void pop()
	{
		if (IsEmpty())
		{
			cout << "\nError! Stack Underflow\n";
			return ;
		}
		else
		{
			cout << array[top] << " is Popped\n";
			top--;
		}
	}
	//6
	int count() { return top + 1; }
	//7
	T peek(int num)
	{
		// top == -1
		if(IsEmpty())
		{
			cout << "\nError! Stack Underflow\n";
		}
		else
		{
			return array[num];
		}
	}
	//8
	void change(int index, T value)
	{
		if (index < 0)
		{
			cout << "\nError! Stack Underflow\n";
		}
		else if (index > top)
		{
			cout << "\nError! Stack Overflow\n";
			return;
		}
		else
		{
			array[index] = value;
		}
	}
	//9
	void display()
	{
		cout << "values in stack are : \n";
		for (int i = top; i > -1; i--)
		{
			cout << "   " << array[i] << endl;
		}
	}
	//10

	bool Top(T& VALUE)
	{
		if (IsEmpty()) {
			cout << "\nNo element in stack\n";
			return false;
		}
		else {
			VALUE = array[top];
			return true;
		}
	}
	~StackByArray()
	{
		//delete array;
		array = NULL;
		delete array;
	}
};

int main()
{
	StackByArray<int> stack;
	int option=-1, maxsize=0, value=0;

	cout << "Welcome to Stack ADT using array\n"
		<< "1) Push value in Stack\n"
		<< "2) Pop value in Stack\n"
		<< "3) Check Stack is Empty\n"
		<< "4) Check Stack is Full\n"
		<< "5) Count the Elements in Stack\n"
		<< "6) Peek an element in Stack\n"
		<< "7) Change a specfic value in Stack\n"
		<< "8) Display the whole Stack\n"
		<< "9) Show the TOP element\n"
		<< "10) Clear the Screen\n"
		<< "0) For terminating the program\n";
	while (option != 0)
	{
		/*cout << "Welcome to Stack ADT using array\n"
			<< "1) Push value in Stack\n"
			<< "2) Pop value in Stack\n"
			<< "3) Check Stack is Empty\n"
			<< "4) Check Stack is Full\n"
			<< "5) Count the Elements in Stack\n"
			<< "6) Peek an element in Stack\n"
			<< "7) Change a specfic value in Stack\n"
			<< "8) Display the whole Stack\n"
			<< "9) Clear the Screen\n"
			<< "0) For terminating the program\n";
		cin >> option;*/
		cin >> option;
		switch (option)
		{
		case 0:
			cout << "\nHave a Good Day\n";
			//stack.~StackByArray();
			break;
		case 1:
			cout << "\nEnter the value you want to push : ";
			cin >> value;
			stack.push(value);
			break;
		case 2:
			stack.pop();
			//cout << " Value popped\n";
			break;
		case 3:
			if (stack.IsEmpty())
			{
				cout << "\nStack is Empty\n";
			}
			else
				cout << "\nStack is NOT empty\n";
			break;
		case 4:
			if (stack.IsFull())
			{
				cout << "\nStack is Full\n";
			}
			else
				cout << "\nStack is NOT Full\n";
			break;
		case 5:
			cout << "\nElements in stack are : " << stack.count() << "\n";
			break;
		case 6:
			cout << "\nEnter the index you want to peek : ";
			cin >> value;
			cout << "\nThe value is : " << stack.peek(value);
			break;
		case 7:
			cout << "\nEnter the value you want to change : ";
			cin >> value;
			cout << "\nEnter the index : ";
			cin >> maxsize;
			stack.change(maxsize, value);
			break;
		case 8:
			cout << "\nThe values in Stack are : \n";
			stack.display();
			break;
		case 9:
			if(stack.Top(value))
				cout << "The element on top is : " << value;
			break;
		case 10:
			system("clear");
            		//system("Cls"); //for windows visual C++
			cout << "Welcome to Stack ADT using array\n"
				<< "1) Push value in Stack\n"
				<< "2) Pop value in Stack\n"
				<< "3) Check Stack is Empty\n"
				<< "4) Check Stack is Full\n"
				<< "5) Count the Elements in Stack\n"
				<< "6) Peek an element in Stack\n"
				<< "7) Change a specfic value in Stack\n"
				<< "8) Display the whole Stack\n"
				<< "9) Clear the Screen\n"
				<< "0) For terminating the program\n";
			break;
		default:
			cout << "\nWrong Input\n";
			break;
		}
	}
	cout << "--------Program-Ended--------";

	return 0;
}

Stack using dynamic arrays in C++

• This code is implemented with the concepts of OOP's in C++