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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.