Реферат: Линейные списки. Стек. Дек. Очередь
qList := ListBegin;
i := 0;
while i <> ListPos do
begin
qList := qList^.Next;
Inc(i);
end;
if qList <> nil then
begin
if qList^.Next <> nil then Inc(ListPos);
i := 0;
j := 0;
while i < ListPos do
begin
Inc(j);
if Edit1.Text[j] = ' ' then Inc(i);
end;
Image1.Left := Round(9 + (j + 1) * 7.5);
end;
end;
procedure TForm1.Button7Click(Sender: TObject);
var
qListTwo: ListTwo;
i, j: Integer;
begin
StatusBar1.Panels[0].Text := '';
qListTwo := ListTwoBegin;
i := 0;
if ListTwoPos <> 0 then dec(ListTwoPos);
i := 0;
j := 0;
while i < ListTwoPos do
begin
Inc(j);
if Edit2.Text[j] = ' ' then Inc(i);
end;
if ListTwoPos = 0 then Image2.Left := 9
else Image2.Left := Round(9 + (j + 1) * 7.5);
end;
procedure TForm1.Button8Click(Sender: TObject);
var
qListTwo: ListTwo;
i, j: Integer;
begin
StatusBar1.Panels[0].Text := '';
qListTwo := ListTwoBegin;
i := 0;
while i <> ListTwoPos do
begin
qListTwo := qListTwo^.Next;
Inc(i);
end;
if qListTwo <> nil then
begin
if qListTwo^.Next <> nil then Inc(ListTwoPos);
i := 0;
j := 0;
while i < ListTwoPos do
begin
Inc(j);
if Edit2.Text[j] = ' ' then Inc(i);
end;
Image2.Left := Round(9 + (j + 1) * 7.5);
end;
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
DestroyList(ListBegin);
DestroyListTwo(ListTwoBegin);
DestroyList(QueueBegin);
DestroyList(Stack);
DestroyListTwo(DeckBegin);
Application.Terminate;
end;
procedure TForm1.Button15Click(Sender: TObject);
begin
StatusBar1.Panels[0].Text := 'Нельзя !!!';
Memo1.Lines.Add('В стеке нельзя возвращаться в начало т.к. указатель указывает сразу на начало;');
end;
procedure TForm1.Button16Click(Sender: TObject);
var
i: Integer;
s: string;
begin
StatusBar1.Panels[0].Text := '';
GetStack(Stack);
if Stack <> nil then
begin
while Edit4.Text[StackPos] <> ' ' do Inc(StackPos);
Inc(StackPos);
s := Edit4.Text;
for i := 1 to StackPos - 1 do
if s[i] <> ' ' then s[i] := ' ';
Edit4.Text := s;
end
else
begin
ShowMessage('Стек пуст');
Edit4.Text := '';
Image4.Hide;
Button14.Enabled := False;
Button15.Enabled := False;
Button16.Enabled := False;
StatusBar1.Panels[1].Text := 'Стек пуст';
end;
Image4.Left := Round(StackPos * 7);
end;
procedure TForm1.Button20Click(Sender: TObject);
var
i: Integer;
s: string;
begin
StatusBar1.Panels[0].Text := '';
GetDeckBegin(DeckBegin);
if DeckBegin <> nil then
begin
while Edit5.Text[DeckBeginPos] <> ' ' do Inc(DeckBeginPos);
Inc(DeckBeginPos);
s := Edit5.Text;
for i := 1 to DeckBeginPos - 1 do
if s[i] <> ' ' then s[i] := ' ';
Edit5.Text := s;
end;
if (DeckBegin = nil) and (DeckBegin = DeckEnd) then
begin
ShowMessage('Дек пуст');
Edit5.Text := '';
Image5.Hide;
Image6.Hide;
Button18.Enabled := False;
Button19.Enabled := False;
Button20.Enabled := False;
StatusBar1.Panels[1].Text := 'Дек пуст';
end;
Image5.Left := Round(DeckBeginPos * 7);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Windows.SetFocus(Button21.Handle);
end;
procedure TForm1.Button19Click(Sender: TObject);
var
i, a: Integer;
s: string;
begin
StatusBar1.Panels[0].Text := '';
GetDeckEnd(DeckEnd);
if DeckEnd <> nil then
begin
while Edit5.Text[DeckEndPos] <> ' ' do Dec(DeckEndPos);
Dec(DeckEndPos);
s := Edit5.Text;
for i := DeckEndPosition downto DeckEndPos + 1 do
if s[i] <> ' ' then s[i] := ' ';
Edit5.Text := s;
//удаляем все пробелы конце строки
s := '';
i := Length(Edit5.Text) - 1;
while Edit5.Text[i] = ' ' do Dec(i);
for a := 1 to i do s := s + Edit5.Text[a];
Edit5.Text := s;
end;
if (DeckEnd = nil) and (DeckBegin = DeckEnd) then
begin
ShowMessage('Дек пуст');
Edit5.Text := '';
Image5.Hide;
Image6.Hide;
Button19.Enabled := False;
Button20.Enabled := False;
StatusBar1.Panels[1].Text := 'Дек пуст';
end;
Image6.Left := Round(DeckEndPos * 7 - 9);
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
Form5.Show;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
DeleteFromList(ListPos);
DoNewEditList;
end;
procedure TForm1.Button6Click(Sender: TObject);
begin
DeleteFromListTwo(ListTwoPos);
DoNewEditListTwo;
end;
procedure TForm1.Button10Click(Sender: TObject);
var
i, a: Integer;
s1, s2: string;
begin
GetQueue(QueueBegin);
if QueueBegin <> nil then
begin
i := QueuePos;
while (Edit3.Text[i] <> ' ') and (i <= Length(Edit3.Text)) do Inc(i);
Inc(i);
s1 := '';
s2 := '';
for a := 1 to QueuePos - 1 do s1 := s1 + Edit3.Text[a];
for a := i to Length(Edit3.Text) do s2 := s2 + Edit3.Text[a];
Edit3.Text := s1 + s2;
end;
end;
procedure TForm1.Button9Click(Sender: TObject);
begin
Form4.Show;
end;
procedure TForm1.Button14Click(Sender: TObject);
var
i, a: Integer;
s1, s2: string;
begin
GetStack(Stack);
i := StackPos;
while (Edit4.Text[i] <> ' ') and (i <= Length(Edit4.Text)) do Inc(i);
Inc(i);
s1 := '';
s2 := '';
for a := 1 to StackPos - 1 do s1 := s1 + Edit4.Text[a];
for a := i to Length(Edit4.Text) do s2 := s2 + Edit4.Text[a];
Edit4.Text := s1 + s2;
end;
procedure TForm1.Button13Click(Sender: TObject);
begin
Form6.Show;
end;
procedure TForm1.Button17Click(Sender: TObject);
begin
Form7.Show;
end;
procedure TForm1.Button18Click(Sender: TObject);
begin
Form8.Show;
end;
procedure TForm1.Button26Click(Sender: TObject);
begin
StatusBar1.Panels[0].Text := 'Нельзя !!!';
Memo1.Lines.Add('В цикл. списке нельзя перемещаться назад, т.к. по сути цикл. список это однонаправ. список и следовательно связь существует только в одну сторону;');
end;
procedure TForm1.Button25Click(Sender: TObject);
var
qRoundList: List;
i, j: Integer;
Count: Integer;
begin
StatusBar1.Panels[0].Text := '';
qRoundList := RoundList^.Next;
// Подсчет кол-ва елементов в списке
Count := 1;
while qRoundList <> RoundList do
begin
Inc(Count);
qRoundList := qRoundList^.Next;
end;
qRoundList := RoundList;
i := 0;
while i <> RoundListPos do
begin
qRoundList := qRoundList^.Next;
Inc(i);
end;
if qRoundList <> nil then
begin
if qRoundList^.Next <> nil then Inc(RoundListPos);
if RoundListPos > Count - 1 then RoundListPos := 0;
i := 0;
j := 0;
while i < RoundListPos do
begin
Inc(j);
if Edit7.Text[j] = ' ' then Inc(i);
end;
if RoundListPos = 0 then j := -1;
Image7.Left := Round(9 + (j + 1) * 7.5);
end;
end;
procedure TForm1.Button23Click(Sender: TObject);
begin
Form9.Show;
end;
procedure TForm1.Button24Click(Sender: TObject);
begin
if RoundList <> nil then
begin
DeleteFromRoundList(RoundListPos);
if RoundList <> nil then DoNewEditRoundList;
end
else
begin
Edit7.Text := '';
ShowMessage('Циклический список пуст');
Button24.Enabled := False;
Button25.Enabled := False;
Button26.Enabled := False;
Image7.Hide;
end;
end;
procedure TForm1.N2Click(Sender: TObject);
begin
Close;
end;
procedure TForm1.N5Click(Sender: TObject);
begin
AboutBox.Visible := True;
end;
procedure TForm1.N4Click(Sender: TObject);
begin
Form10.Visible := True;
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