While

The statement While is used to repeat a loop based on a condition.

Syntax

While <Boolean expression>

Do

  ...;

Od;

The condition is (re) evaluated before every iteration of the loop. If the condition evaluates to True the loop is executed. If the condition evaluates to False, ITP/Server will continue with the next statement following the Od.

The Break command can be used to terminate the loop unconditionally.

Example

Parameter Text String;

While String <> ""

Do

  Progress Message (substring (String, 1, 1));

  String = rsubstring (String, 2, 0);

Od;

This script sends all characters from the parameter to the client, one character at a time. Note the use of rsubstring. This function returns the input string minus the first character: the 2 parameter takes care of that, the 0 parameter says that no characters must be left out from the end of the input string.