ILE COBOL Language Reference
The execution of the EVALUATE statement then proceeds as if
the values assigned to the selection subjects and selection objects were
compared to determine whether any WHEN phrase satisfies the set of selection
subjects. This comparison proceeds as follows:
- Each selection object within the set of selection objects for the first
WHEN phrase is compared to the selection subject having the same ordinal
position within the set of selection subjects. One of the following
conditions must be satisfied if the comparison is to be satisfied:
- If the items being compared are assigned numeric or nonnumeric values, or
a range of numeric or nonnumeric values, the comparison is satisfied if the
value, or one value in the range of values, assigned to the selection object
is equal to the value assigned to the selection subject, according to the
rules for comparison.
- If the items being compared are assigned truth values, the comparison is
satisfied if the items are assigned identical truth values.
- If the selection object being compared is specified by the word ANY, the
comparison is always satisfied, regardless of the value of the selection
subject.
- If the above comparison is satisfied for every selection object within the
set of selection objects being compared, the WHEN phrase containing that set
of selection objects is selected as the one satisfying the set of selection
subjects.
- If the above comparison is not satisfied for every selection object within
the set of selection objects being compared, that set of selection objects
does not satisfy the set of selection subjects.
- This procedure is repeated for subsequent sets of selection objects in the
order of their appearance in the source program, until either a WHEN phrase
satisfying the set of selection subjects is selected or until all sets of
selection objects are exhausted.
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