For

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keyword used with "to"\"downto" and "do" to execute a loop in which the value of a control variable is incremented or decremented by 1 each time:

FOR control_variable := start TO final DO statement

which increases control_variable by 1 on each execution of the loop until the value is greater than or equal to final or

FOR control_variable := start DOWNTO final do statement

which decreases control_variable by 1 on each execution of the loop until the value is less than or equal to final

Where control_variable is the variable to be set to the value of start. The control variable is increased or decreased by 1 on each loop until its value reaches or exceeds final.

for I := 1 to 100 do statement;

(repeats statement one hundred times, increasing I from 1 to 100)

for I := 100 downto 1 do statement;

(repeats statement one hundred times, decreasing I from 100 to 1)

  • FOR will loop through only the single statement that follows it. To execute more than one statement, enclose the group of statements in a Begin/End block.
  • In a for..to loop, if start is greater than final, the loop is not executed
  • in a for..downto loop, if start is less than final, the loop is not executed

After the loop, the value of control_variable will be final. If the loop was not executed, the value of control_variable does not change.

  • you can use types instead of numbers.


See also



Keywords: begindoelseendforifrepeatthenuntilwhile