From Lazarus-ccr

keyword used with "to"\"downto" and "do" for a loop:

 
  for I:=1 to 100 do
 

(repeats the actions for a hundred times,from 1 to 100)

 
  for I:=100 downto 1
 

(repeats the actions for a hundred timed,from 100 to 1)

• you can use types instead of numbers.

Keywords: begin — do — else — end — for — if — repeat — then — until — while