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unit Unit11; //设定随机数范围, 返回数组长度, 得到一组不重复的随机数
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm11 = class(TForm)
btn1: TButton;
procedure btn1Click(Sender: TObject);
private
//生成的随机数函数
function CreateRandom(const RangeStart, RangeEnd,
ResultCount: integer): Tarray<Integer>;
{ Private declarations }
public
{ Public declarations }
end;
var
Form11: TForm11;
implementation
{$R *.dfm}
//CreateRandom(随机数取值范围起始值, 终止值; 返回数组长度)
function TForm11.CreateRandom(const RangeStart, RangeEnd, ResultCount : integer) : Tarray<Integer>;
var
tmpLst : TStringList; //可以使用泛型列表或数组代替
I, n: Integer;
begin
if RangeStart >= RangeEnd then
raise Exception.Create('错误的随机数范围!');
if ResultCount < 1 then
raise Exception.Create('随机数返回数组长度必须大于0!');
tmpLst := TStringList.Create;
tmpLst.Capacity := RangeEnd - RangeStart;
try
for n := RangeStart to RangeEnd do
begin
tmpLst.Add(IntToStr(n));
end;
Randomize;
SetLength(Result, ResultCount);
for I := 0 to ResultCount do
begin
n := Random(tmpLst.Count - 1);
Result[i] := StrToInt(tmpLst.Strings[n]);
tmpLst.Delete(n);
end;
finally
tmpLst.free;
end;
end;
procedure TForm11.btn1Click(Sender: TObject);
var
MyArr : Tarray<Integer>;
I : Integer;
s : string;
begin
s := '';
MyArr := CreateRandom(0, 100, 10);
for I := Low(MyArr) to High(MyArr) do
s := s + inttostr(Myarr[i]) + ' ';
ShowMessage(s);
s := '';
MyArr := CreateRandom(100, 1000, 15);
for I := Low(MyArr) to High(MyArr) do
s := s + inttostr(Myarr[i]) + ' ';
ShowMessage(s);
end;
end.
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