Conditional Statements
A conditional statement specifies that the truth value of a condition is to be determined, and that the subsequent action of the object program is dependent on this truth value. (See Conditional Expressions.)
Figure 1 lists COBOL statements that are conditional, or that become conditional when a condition is included (for example: ON SIZE ERROR, or ON OVERFLOW) and the statement is not terminated by its explicit scope terminator.
Figure 1. Conditional Statements
Arithmetic Ordering
ADD...ON SIZE ERROR RETURN...AT END
ADD...NOT ON SIZE ERROR RETURN...NOT AT END
COMPUTE...ON SIZE ERROR
COMPUTE...NOT ON SIZE ERROR
DIVIDE...ON SIZE ERROR
DIVIDE...NOT ON SIZE ERROR
MULTIPLY...ON SIZE ERROR
MULTIPLY...NOT ON SIZE ERROR
SUBTRACT...ON SIZE ERROR
SUBTRACT...NOT ON SIZE ERROR
Data Manipulation Subprogram Linkage
STRING...ON OVERFLOW CALL...ON OVERFLOW
STRING...NOT ON OVERFLOW CALL...ON EXCEPTION
UNSTRING...ON OVERFLOW CALL...NOT ON EXCEPTION
UNSTRING...NOT ON OVERFLOW
IBM Extension XML GENERATE...ON EXCEPTION
XML GENERATE...NOT ON EXCEPTION
XML PARSE...ON EXCEPTION
XML PARSE...NOT ON EXCEPTION End of IBM Extension
Decision Table Handling
IF SEARCH...WHEN
EVALUATE
Input/Output
ACCEPT...ON EXCEPTION READ...NO DATA
ACCEPT...NOT ON EXCEPTION REWRITE...INVALID KEY
DELETE...INVALID KEY REWRITE...NOT INVALID KEY
DELETE...NOT INVALID KEY START...INVALID KEY
DISPLAY...ON EXCEPTION START...NOT INVALID KEY
DISPLAY...NOT ON EXCEPTION WRITE...AT END~OF~PAGE
READ...AT END WRITE...NOT AT END~OF~PAGE
READ...NOT AT END WRITE...INVALID KEY
READ...INVALID KEY WRITE...NOT INVALID KEY
READ...NOT INVALID KEY