7.4

Table Of Contents

l "If (function)" (page 554)

Repeat... Until (procedure)

Repeat a sequence of commands until a condition is true. It is similar to a for... endfor loop in that you can nest the loops. It is

different from a for... endfor loop in that the loop always executes at least once, and that you tie the number of times the

loop repeats to a Boolean condition. For example you might tie the number of times the loop repeats to the occurrence of a

piece of data in the data stream.

Syntax

repeat

…

until( expression )

Argument

expression

Boolean value. If it evaluates to true, the loop ends. If it evaluates to false, the loop repeats.

Code Sample Example

This example prints the string ‘Cheers’ ten times, one underneath the other, with a dashed line above and below the ten

instances.

Example

show('---------------')

crlf(0.16)

&count := 1

repeat

&count := &count + 1

show('Cheers')

crlf(0.16)

until(&count = 10)

show('---------------')

crlf(0.16)

Search … EndSearch (procedure)

This command structure allows a series of nested commands to be repeated as long as a specific string of characters (the

search string) is found within another string (the target string). After each iteration, the target string contains all the data

between occurrences of the search string, excluding the search string. Once the loop is over, target contains the remaining

characters of the original data.