unit1.pas

第五章练习题

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Edit2: TEdit;
    Label3: TLabel;
    Label4: TLabel;
    Edit3: TEdit;
    Edit4: TEdit;
    Button1: TButton;
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
function gongyue(a,b:integer):integer;
var
r,c:integer;
begin
if a>b then
begin
r:=a;
a:=b;
b:=r;
end;
r:=b mod a;
while r<>0 do
begin
a:=b;
b:=r;
r:=b mod a;
end;
result:=a;
end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var l:boolean;
begin
l:=(key<#48)or(key>#57);
if l then key:=#0;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
a,b:integer;
begin
if(edit1.Text='')then edit1.Text:='1';
if(edit2.Text='')then edit2.Text:='1';
a:=strtoint(edit1.Text);
b:=strtoint(edit2.Text);
edit3.Text:=inttostr(trunc(a/gongyue(a,b)));
edit4.Text:=inttostr(trunc(b/gongyue(a,b)));
a:=strtoint(edit3.Text);
b:=strtoint(edit4.Text);
if a mod b=0 then
begin
edit3.Text:=inttostr(trunc(a/b));
edit4.Text:='1';
end;
end;

end.