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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:

  // 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.

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