Basic Pascal Tutorial/Chapter 3/REPEAT..UNTIL

From Lazarus wiki
Revision as of 21:35, 20 November 2020 by HowardPC (talk | contribs) (rewrite in more idiomatic English)
Jump to navigationJump to search

български (bg) English (en) français (fr) 日本語 (ja) 中文(中国大陆)‎ (zh_CN)

 ◄   ▲   ► 

REPEAT...UNTIL

The repeat .. until construct is termed a post-test loop, because the controlling condition is tested after each iteration of the loop.

It has the following syntax:

repeat
  statement1;
  // statement2;
  // further statements...
until BooleanExpression;

A repeat loop encloses its executed statements, which means they do not need to be further enclosed in a begin ... end block. Note that a repeat loop continues until its controlling Boolean expression is TRUE; whereas the while loop continues until its Boolean expression is FALSE.

Use a REPEAT loop when the looping statement(s) must execute at least once, whatever the initial value of the controlling Boolean condition.

 ◄   ▲   ►