@Override
    public String toFormattedString()
    {
        String output = m_exp1.toFormattedString() + " ";
        
        if ( m_op == Op.PLUS )
            output += "+";
        else if ( m_op == Op.MINUS )
            output += "-";
        else if ( m_op == Op.TIMES )
            output += "*";
        else
            output += "/";
        
        output += " " + m_exp2.toFormattedString();
        return output;
    }