A DO construct has an extended range if both of the
following are true:
- The DO construct contains a control statement that
transfers control out of the construct.
- Another control statement returns control back into the
construct after execution of one or more statements.
The range of the construct is extended to include all
executable statements between the destination statement of the first transfer
and the statement that returns control to the construct.
The following rules apply to a DO construct with
- A transfer into the range of a DO statement is
permitted only if the transfer is made from the extended range of that DO
- The extended range of a DO statement must not change the
control variable of the DO statement.
Figure 7-3 illustrates valid and invalid
extended range control transfers.
Figure 7-3 Control Transfers and Extended Range
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