Control words are used in Explicit Definition (:) and are punctuation that determine the sequence of execution. Matching control words and the enclosed sentences make up a control structure.
The following control words and structures are available, where words beginning with B or T denote sentence blocks:
assert. T Trigger error break. Terminate loop continue. Terminate iteration for. T do. B end.
for_xyz. T do. B end.
Repeat for goto_lbl.
Go to label if. T do. B end.
if. T do. B else. B1 end.
Execute if /
return. Exit with result select. T
case. T0 do. B0
fcase. T1 do. B1
case. T2 do. B2
Execute case throw. Execute throw try. B
Execute try while.