unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
{对字符}
procedure TForm1.Button1Click(Sender: TObject);
var
C: Char;
begin
C := 'A';
C := Char(CharLower(PChar(C)));
ShowMessage(C); {a}
end;
{对字符常量}
procedure TForm1.Button2Click(Sender: TObject);
var
C: Char;
begin
C := Char(CharLower(PChar('A')));
ShowMessage(C); {a}
end;
{对字符数组}
procedure TForm1.Button3Click(Sender: TObject);
var
Arr: array[0..2+1] of Char;
begin
Arr := 'ABC';
CharLower(Arr);
ShowMessage(Arr); {abc}
end;
{对字符串}
procedure TForm1.Button4Click(Sender: TObject);
var
str: string;
begin
str := 'ABC';
CharLower(@str[1]);
ShowMessage(str); {abc}
end;
{Delphi 的 SysUtils.LowerCase}
procedure TForm1.Button5Click(Sender: TObject);
var
str: string;
begin
str := 'ABC';
str := LowerCase(str);
ShowMessage(str); {abc}
end;
责任编辑：小草
