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C++ Program to check expression is well parenthesized or not? using Stack Data Structure

 Problem Statement: In many language program mostly syntax error occurs due to unbalancing delimiter such as (),{},[]. Write C++ program using stack to check whether given expression is well parenthesized or not.

Note: Scroll Horizontally to see the full line of code.

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

string s;

class Stack
{
    char *arr;
    int top = -1;

public:
    Stack()
    {
        arr = new char[100];
        top = -1;
    }

    void push(char x)
    {
        top++;
        arr[top] = x;
    }

    void pop()
    {
        if (top == -1)
        {
            cout << "NO element in stack" << endl;
            return;
        }
        top--;
    }

    char Top()
    {
        return arr[top];
    }

    bool empty()
    {
        return top == -1;
    }
};

Stack st;

bool isValid(string s)
{
    int n = s.length();

    bool ans = true;
    for (int i = 0; i < n; i++)
    {
        if (s[i] == '(' or s[i] == '[' or s[i] == '{')
        {
            st.push(s[i]);
        }
        else if (s[i] == ')')
        {
            if (!st.empty() and st.Top() == '(')
            {
                st.pop();
            }
            else
            {
                ans = false;
                break;
            }
        }
        else if (s[i] == ']')
        {
            if (!st.empty() and st.Top() == '[')
            {
                st.pop();
            }
            else
            {
                ans = false;
                break;
            }
        }
        else if (s[i] == '}')
        {
            if (!st.empty() and st.Top() == '{')
            {
                st.pop();
            }
            else
            {
                ans = false;
                break;
            }
        }
    }

    if (!st.empty())
    {
        return false;
    }
    return ans;
}

int main()
{
    char cont = 'y';
    while (cont == 'y')
    {

        cout << "Enter the parenthesise expression: ";
        cin >> s;

        if (isValid(s))
        {
            cout << "Expression is well parenthesized!!!" << endl;
        }

        else
        {
            cout << "Expression is not well parenthesized!!!" << endl;
        }
        cout << "Do you want to continue? (y/n): ";
        cin >> cont;
    }

    cout << "Program Ended Successfully!!!!" << endl;
    return 0;
}
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