public override int VisitMulDiv(CalculatorParser.MulDivContext context)
        {
            int left  = Visit(context.expr(0));
            int right = Visit(context.expr(1));

            if (context.op.Type == CalculatorParser.MUL)
            {
                return(left * right);
            }
            else
            {
                return(left / right);
            }
        }
 /// <summary>
 /// Visit a parse tree produced by the <c>MulDiv</c>
 /// labeled alternative in <see cref="CalculatorParser.expr"/>.
 /// <para>
 /// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
 /// on <paramref name="context"/>.
 /// </para>
 /// </summary>
 /// <param name="context">The parse tree.</param>
 /// <return>The visitor result.</return>
 public virtual Result VisitMulDiv([NotNull] CalculatorParser.MulDivContext context)
 {
     return(VisitChildren(context));
 }
 /// <summary>
 /// Exit a parse tree produced by the <c>MulDiv</c>
 /// labeled alternative in <see cref="CalculatorParser.expr"/>.
 /// <para>The default implementation does nothing.</para>
 /// </summary>
 /// <param name="context">The parse tree.</param>
 public virtual void ExitMulDiv([NotNull] CalculatorParser.MulDivContext context)
 {
 }