unit Unit2;

interface
type
    TEmployee = class;
    private
        FName: String;
    public
        Constructor Create;
        function GetName: String;
        procedure SetName(AName: String);
    end;

implementation
    constructor TEmployee.Create;
    begin
        FName:= 'Xumenger';
    end;

    function TEmployee.GetName: String;
    begin
        Result:= FName;
    end;

    procedure TEmployee.SetName(AName: String);
    begin
        FName:= AName;
    end;

end.

uses
    Unit2;

procedure TForm1.Button1Click(Sender: TObject);
var
    AEmployee: TEmployee;
begin
    AEmployee:= TEmployee.Create;
    AEmployee.SetName('Joker');
    MessageBox(Handle, PChar(AEmployee.GetName), 'Employee' 0);
    AEmployee.Free;
end;

unit Unit2;
interface
type
    TDivision = class
    public
        function GetDiv(Num1, Num2: Double): Double; overload;
        function GetDiv(Num1, Num2: Integer): Integer; overload;
    end;

implementation
    function TDivision.GetDiv(Num1, Num2: Double): Double;
    begin
        try
            Result:= Num1/Num2;
        except
            Resulr:=0;    //提供弹性处理机制，处理除数为0的情况
        end;
    end;

    function TDivision.GetDiv(Num1, Num2: Integer): Integer;
    begin
        try
            Result:= Num1 div Num2;    //注意Double的除法和Integer的除法的操作符的差别
        except
            Resulr:=0;    //提供弹性处理机制，处理除数为0的情况
        end;
    end;

uses    
    Unit2;

procedure TForm1.ButtonClick(Sender: TObject);
var
    Division: TDivision;
    IValue: Integer;
    FValue: Double:
begin
    Division:= TDivision.Create;
    IValue:= Division.GetDiv(1, 2);
    FValue:= Division.GetDiv(1.0, 2);
    IValue:= Division.GetDiv(1, 0);
    FValue:= Division.GetDiv(1.0, 0);
    Division.Free;
end;

unit Unit2;

interface
type
    TDivision = class
    public
        function GetDiv(Num1, Num2: Double): Double; overload;
        function GetDiv(Num1, Num2: Integer): Integer; overload;
    end;

type
    TOperation = class(TDivision)
    public 
        function GetAdd(Num1, Num2: Double): Double;
    end;

implementation

{ Division }

function TDivision.GetDiv(Num1, Num2: Double): Double;
begin
   try
     Result:=Num1/Num2;
   except
     Result:=0;
   end;
end;

function TDivision.GetDiv(Num1, Num2: integer): integer;
begin
   try
     Result:=Num1 div Num2;
   except
     Result:=0;
   end;
end;

{ TOperation }

function TOperation.GetAdd(Num1, Num2: Double): Double;
begin
   Result:=Num1+Num2;
end;

end.