stack_parenthesis

//do while is not working
#include <iostream>
#include<string>
using namespace std;
class stack
{
public:
	int top;
	char* array;
	int size;
	stack()
	{
		top = -1;
	}
	bool isMatching(char *exp);
	void push(int n);
	bool isempty();
	void pop();
};
bool stack::isempty()
{
	if (top == -1)
	{
		return true;
	}
	else
	{
		return false;
	}
}
void stack::pop()
{
	int temp;
	if (top != -1)
	{
		temp = array[top--];
	}
}
bool stack::isMatching(char *exp)
{
	/*char exp[1000];
	cout << "Enter expression" << endl;
	cin.getline(exp, 1000);
	int l = strlen(exp);
	size = l;
	array = new char[l];*/

	for (int i = 0; exp[i] != '\0'; i++)
	{
		if (exp[i] == '(' || exp[i]=='{' || exp[i]=='[')
		{
			push(exp[i]);
			cout << "Pushed" << endl;
		}
		else if (exp[i] == ')' || exp[i] == '}' || exp[i] == ']')
		{
			bool x = isempty();
			if (x == false)
			{
				pop();
				cout << "Popped" << endl;
			}
			else
			{
				return false;
			}
		}
	}
	bool y = isempty();
	if (y == true)
	{
		return true;
	}
	else
	{
		return false;
	}
}
void stack::push(int n)
{
	if (top == size - 1)
	{
		cout << "Full Stack" << endl;
	}
	else
	{
		array[++top] = n;
	}
}
int main()
{
	int n;
    stack st;
	do
	{
		char exp[1000];
		cout << "Enter expression" << endl;
		cin.getline(exp, 1000);
		int l = strlen(exp);
		st.size = l;
		st.array = new char[l];
		bool dec = st.isMatching(exp);

		if (dec == true)
		{
			cout << "Parenthesis Match" << endl;
		}
		else
		{
			cout << "No match" << endl;
		}

		cout << "Enter 0 to exit" << endl;
		cin >> n;

	} while (n != 0);

	return 0;
}