procedure Shuffle(
var aArray;
aItemCount: Integer;
aItemSize: Integer) ;
var
Inx: Integer;
RandInx: Integer;
SwapItem: PByteArray;
A: TByteArray absolute aArray;
begin
if (aItemCount > 1) then
begin
GetMem(SwapItem, aItemSize) ;
try
for Inx := 0 to (aItemCount - 2) do
begin
RandInx := Random(aItemCount - Inx) ;
Move(A[Inx * aItemSize], SwapItem^, aItemSize) ;
Move(A[RandInx * aItemSize],
A[Inx * aItemSize], aItemSize) ;
Move(SwapItem^, A[RandInx * aItemSize],
aItemSize) ;
end;
finally
FreeMem(SwapItem, aItemSize) ;
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject) ;
var
a: array[1..54] of Integer;
i: Shortint;
begin
Randomize;
for i := Low(a) to High(a) do a := i;
Shuffle(a, High(a), SizeOf(Integer)) ;
ListBox1.Clear;
for i := 1 to High(a) - 1 do
ListBox1.Items.Add(IntToStr(a)) ;
end;