Control Data Corporation 3300 Reference Manual page 126

4-46
fucorrect Specifications
x PERFORM a THRU m
a------------------~
d PERFORM f THRU j
f
m ----------------r-~
a
b PERFORM c THRU f
c ----------------~
d---------------~~
f
x PERFORM a THRU d
A procedure associated with one PERFORM statement can overlap or inter-
sect the procedure associated with another PERFORM if neither procedure
includes the PERFORM statement associated with the other procedure.
Correct Specification
x PERFORM a THRU m
a
------------------~
f
m----------------~~
d PERFORM f THRU
j
Format 1:
A procedure referenced
in
the basic PERFORM statement is executed once
and then control passes to statement following the PERFORM. For example:
PERFORM SUMMARY.
Format 2:
When the TIMES option is used, the procedures are performed the number of
times specified by the value of integer-lor the initial value of identifier-I.
At the time of execution, this value must not be negative. If the value is zero,
control passes immediately to the statement following the PERFORM. Other-
wise, the procedures are executed the specified number of times and then
control passes to the statement following the PERFORM. Once execution is
begun, any change to identifier-1 has no effect on the number of times the
procedures are executed.
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