Delphi Basics : To command

DelphiBasics

To
Keyword

Prefixes an incremental for loop target value

1	keyword To(for Variable := Integer Expression to Integer Expression do Statement;
2	for Variable := Char Expression to Char Expression do Statement;
3	for Variable := Enum Expression to Enum Expression do Statement;

Description

The To keyword prefixes the target value Expression in a For loop.

The To expression maybe an Integer, Character or Enumeration type.

See the For keyword for full details. The examples illustrate the three expression types.

Related commands

Begin		Keyword that starts a statement block
DownTo		Prefixes an decremental for loop target value
End		Keyword that terminates statement blocks
For		Starts a loop that executes a finite number of times

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Example code : Integer for loop

var
  i : Integer;

begin
  // Loop 5 times
  for i := 1 To (10 div 2) do
    ShowMessage('i = '+IntToStr(i));
end;

Show full unit code

  i = 1
  i = 2
  i = 3
  i = 4
  i = 5

Example code : Character for loop

var
  c : char;
begin
  // Loop 5 times
  for c := 'A' To 'E' do
    ShowMessage('c = '+c);
end;

Show full unit code

  c = A
  c = B
  c = C
  c = D
  c = E

Example code : Enumeration for loop

var
  suit : (Hearts, Clubs, Diamonds, Spades);
begin
  // Loop 3 times
  for suit := Hearts To Diamonds do
    ShowMessage('Suit = '+IntToStr(Ord(suit)));
end;

Show full unit code

  Suit = 0
  Suit = 1
  Suit = 2