DS Questions - Question 1 - C++

MyStack.h

#pragma once

template<class T>
class MyStack
{
private:
	T * array;
	int maxSize;
public:
	int front;

	//constructor
	MyStack(int a=20);

	//destructor
	~MyStack(void);
	
	//pushing elements to the stack
	void push(T a);

	//poping elements from stack
	T pop();

	//getting last element without poping from the stack
	T peek();

	//checks if the stack is empty of not
	bool isEmpty();

	//checks that if the stack is full
	bool isFull();
};

template<class T>
MyStack<T>::MyStack(int a){
	array = new T[a];
	maxSize = a;
	front = 0;
}

template<class T>
MyStack<T>::~MyStack(void)
{
}

template<class T>
void MyStack<T>::push(T a){
	array[front++] = a;
}

template<class T>
T MyStack<T>::pop(){
	if(isEmpty())
		return 0;
	return array[front--];
}

template<class T>
T MyStack<T>::peek(){
	if(isEmpty())
		return 0;
	return array[front-1];
}

template<class T>
bool MyStack<T>::isEmpty(){
	return !front;
}

template<class T>
bool MyStack<T>::isFull(){
	return maxSize == front+1;
}

q1.cpp

#include <iostream>
#include <sstream> //for the getline() function
#include "MyStack.h"

using namespace std;

int main(){
	MyStack <char> foundSigns;
	string str;
	bool isWrong = false;
	getline(cin,str);
	for(unsigned int i=0;i<str.length();i++){
		char c = str[i];
		if(c == '[' || c == '(' || c == '{'){
			foundSigns.push(c);
		} else if(c == ']' || c == ')' || c == '}'){
			char c2 = foundSigns.peek();
			foundSigns.pop();
			if( c == ']' && c2 !='[')
				isWrong = true;
			else if( c == ')' && c2 !='(')
				isWrong = true;
			else if( c == '}' && c2 !='{')
				isWrong = true;
			if(isWrong)
				break;
		}
	}
	if(!foundSigns.isEmpty())
		isWrong = true;

	if(isWrong)
		cout<<"Wrong!";
	else
		cout<<"Right!";
	getchar();
	return 0;
}