To

From Free Pascal wiki
Jump to navigationJump to search

Deutsch (de) English (en) français (fr) русский (ru)


Back to Reserved words.


Keyword used to indicate the final value of the control value in a For loop, and that the loop is to increment the control variable by 1 on each loop. The value specified by TO should be greater than the initial value of the for loop.

For to do

var i : integer;
begin
 for i := 1 to 10000 do
   begin
     //...
   end;
end;

The for to allow to execute code repeatedly for a fixed number of times.

Basic example

var
  loopValue, startValue, endValue, resultValue: integer;
begin
  startValue := 10;
  endValue := 11;
  resultValue := 0;
  for loopValue := startValue to endValue do
    begin
      resultValue := loopValue + resultValue;
    end;
end;

The loop execute two times and variable resultValue value is 21.

Start and end value same

var
  loopValue, startValue, endValue, resultValue: integer;
begin
  startValue := 10;
  endValue := 10;
  resultValue := 0;
  for loopValue := startValue to endValue do
    begin
      resultValue := loopValue + resultValue;
    end;
end;

The loop execute one time and variable resultValue value is 10.

Start value bigger than end value

var
  loopValue, startNumber, endNumber, resultValue: integer;
begin
  startValue := 10;
  endValue := 9;
  resultValue := 0;
  for loopValue := startValue to endValue do
    begin
      resultValue := loopValue + resultValue;
    end;
end;

The loop execute none time and variable resultValue value is 0.

Read more