int Expression::Equals()
{
    int evaluator = 0;
    int tmp = 0;
    stack<int> num;
    char op;

    for(int i = 0; i < postfix.size(); i++)
    {
        postfix[i].display();
        if(postfix[i].get_type() == letter)
        {
            cout << "inside letter" << endl;
            num.push(postfix[i].get_variable());
        }
        else if(postfix[i].get_type() == integer)
        {
            cout << "inside integer" << endl;
            tmp = stoi(postfix[i].get_token());
            num.push(tmp);
        }
        else if(postfix[i].get_type() == op)
        {
            cout << "inside op" << endl;
            evaluator = num.top();
            cout << evaluator << endl;
            num.pop();
            if(postfix[i].get_token() == "+")
            {
                evaluator += num.top();
                num.pop();
            }
            else if(postfix[i].get_token() == "-")
            {
                evaluator -= num.top();
                num.pop();
            }
            else if(postfix[i].get_token() == "*")
            {
                evaluator *= num.top();
                num.pop();
            }
            else if(postfix[i].get_token() == "/")
            {
                evaluator /= num.top();
                num.pop();
            }
            else if(postfix[i].get_token() == "%")
            {
                evaluator %= num.top();
                num.pop();
            }
            num.push(evaluator);
        }
        else
            cout << "inside nothing" << endl;
    }
    return evaluator;
}