/ q-exit /



?EXIT "question-exit"
( true -- ) ( I: ra ip -- ra )
( false -- ) ( I: ra ip -- ra ip )

If the value at the stack top is non-zero, perform EXIT.

?EXIT is quivalent to IF EXIT THEN . Very common.

notation note:

"I:" is the interpretation stack label, the interpretation stack
is he return stack plus the interpretation pointer (IP) on top.

For example, EXIT may be described by the following diagram:

EXIT ( I: ra ip -- ra ) \ remove the top interpretation stack item

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generated Wed Jul 23 02:53:35 2003mlg