#include <iostream>
#include <string>
using namespace std;

class stackFun
{
	private:
		int top;
		int arr[];
	public:
		stackFunctions(int n)
		{
			top = -1;
			/*for (int i = 0; i < n; i++)
			{
				arr[i] = 0;
			}*/
		}
		bool isEmpty()
		{
			if (top == -1)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
		bool isFull(int &n)
		{
			if (top == n-1)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
		void push(int &val, int &n)
		{
			if(isFull(n))
			{
				cout<< "Stack is Full";
			}
			else
			{
				top += 1;
				arr[top] = val;
			}
		}
		int pop()
		{
			if(isEmpty())
			{
				cout << "Stack underflow" << endl;
			}
			else
			{
				int val = arr[top];
				top--;
				return val;
			}
		}
		int display(int &n)
		{
			if (isEmpty())
			{
				cout << "Stack underflow" << endl;
			}
			else
			{
				cout << "The values in the stack are: " << endl;
				for (int i = 0; i < n; i++)
				{
					cout << arr[i] << endl;
				}
			}
		}
		int op()
		{
			cout << endl
				 << "Enter" << endl
		 	  	 << "1 - for push" << endl
				 << "2 - for pop" << endl
		 		 << "3 - for display" << endl
		 		 << "4 - for exit" << endl;
			cout << "Choice of Action: ";
		}
		void dataType(int choice, int val)
		{
			if (choice == 1)
			{
				int val;
			}
			else if (choice == 2)
			{
				float val;
			}
			else if (choice == 3)
			{
				char val;
			}
		}

};

int main()
{
	stackFun p1;
	int choice=0, n=0, val=0;
	/*cout << "Enter" << endl
		 << "1 - for int" << endl
		 << "2 - for float" << endl
		 << "3 - for char" << endl;
	cout << "Choice: ";
	cin >> choice;
	cout << endl;
	p1.dataType(choice, val); */
	cout << "Enter the number of elements in Stack:" << endl;
	cin >> n;
	p1.pop();
	while (choice != 4 || choice > 4){
		p1.op();
		cin >> choice;
		if (choice == 1)
		{
			cout << "Enter Value: ";
			cin >> val;
			p1.push(val, n);
		}
		if (choice == 2)
		{
			p1.pop();
		}
		if (choice == 3)
		{
			p1.display(n);
		}
		if (choice == 4)
		{
			cout << "Closing the program..." << endl;
			exit(0);
		}
	}
}