Description

The REPEAT instruction has the effect that a sequence of instructions is executed repeatedly (at least once), until its related Boolean condition is 1 (true).

The UNTIL instruction marks the end condition.

The occurrence may be terminated early using the EXIT.

The END_REPEAT instruction marks the end of the instruction(s).

In the following cases REPEAT may not be used as it can create an endless loop which causes the program to crash:

• REPEAT may not be used for synchronization between processes, e.g., as a "Waiting Loop" with an externally defined end condition.

• REPEAT may not be used in an algorithm, such as the completion of the loop end condition or execution of an EXIT instruction cannot be guaranteed.

Example REPEAT...UNTIL...END_REPEAT

x := -1;

REPEAT x := x + 2;

UNTIL x >= 101

END_REPEAT;

See Also

EXIT