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DelphiÌṩµÄ×Ö·û´®º¯ÊýÀïÓÐÒ»¸öPosº¯Êý£¬ËüµÄ¶¨ÒåÊÇ£º
function Pos(Substr: string; S: string): Integer;
ËüµÄ×÷ÓÃÊÇÔÚ×Ö·û´®SÖвéÕÒ×Ö·û´®Substr£¬·µ»ØÖµÊÇSubstrÔÚSÖеÚÒ»´Î³öÏÖµÄλÖã¬Èç¹ûûÓÐÕÒµ½£¬·µ»ØֵΪ0¡£
ʹÓÃposº¯ÊýÀ´²éÕÒ×Ö·ûµÚÒ»´Î³öÏÖµÄλÖÃ
var
str1:string;
i,j:integer;
begin
str1:='dsf4654f6<ds>ad' ;
j:=pos('<',str1);//ÔÚ×Ö·û´®str1ÖвéÕÒ"<"
if j<>0 then //µÃµ½µÄjÊÇ×Ö·û´®ÖгöÏÖµÄλÖã¬ÊÇÕûÐÍ
showmessage('<'+'ÔÚµÚ'+inttostr(j)+'¸öλÖÃ'); //µÚÊ®¸öλÖÃ
end;
===============================================
Êײ¿ function StrPos(const Str1, Str2: PChar): PChar; $[SysUtils.pas
¹¦ÄÜ ·µ»ØÖ¸Õë×Ö·û´®Str2ÔÚStr1ÖеÚÒ»¸ö³öÏֵĵØÖ·
˵Ã÷ ûÓÐÕÒµ½Ôò·µ»Ø¿ÕÖ¸Õë;StrPos('12345', '3') = '345'
²Î¿¼ <NULL>
Àý×Ó Edit3.Text := StrPos(PChar(Edit1.Text), PChar(Edit2.Text));
===================================================
StrScan : ·µ»ØÒ»¸ö×Ö·ûÔÚÒ»¸ö PChar ´®ÖеÚÒ»´Î³öÏÖµÄλÖÃÖ¸Õë;
StrRScan : ·µ»ØÒ»¸ö×Ö·ûÔÚÒ»¸ö PChar ´®ÖÐ×îºóÒ»´Î³öÏÖµÄλÖÃÖ¸Õë;
StrPos : ·µ»ØÒ»¸ö PChar ´®ÔÚÁíÒ»¸ö PChar ´®ÖеÚÒ»´Î³öÏÖµÄλÖÃÖ¸Õë.
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
//StrScan¡¢StrRScan:
procedure TForm1.Button1Click(Sender: TObject);
var
p: PChar;
str: string;
begin
str := 'ABCBBBCBA';
p := StrScan(PChar(str), 'B');
ShowMessage(p); {BCBBBCBA}
p := StrRScan(PChar(str), 'B');
ShowMessage(p); {BA}
end;
//StrPos:
procedure TForm1.Button2Click(Sender: TObject);
var
p: PChar;
str: string;
begin
str := '123456789';
p := StrPos(PChar(str), '456');
ShowMessage(p); {456789}
end;
end.
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Ê×Ïȿ϶¨ÊÇÎÒÃǾ³£¿´¼ûµÄIFÓï¾ä¿©. Var
I: Integer;
Begin
I:= 99;
If (I> 0)And (I< 0) Then
Writeln('I>0')
Else
If (I> 10)And (I< 100) Then
Writeln('I>10 and I100');
End.
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