COBOL Manual for TNS and TNS/R Programs

Procedure Division

HP COBOL Manual for TNS and TNS/R Programs—522555-006

8-64

Complex Conditions

A complex condition is a combination of simple conditions and any of the logical

operators NOT, AND and OR. Its truth value is the one that results from the interaction

of the stated logical operators on the individual truth values of the simple conditions or

conditions enclosed within parentheses.

A complex condition formed by applying the unary operator NOT to a simple or

parenthetical condition is called a negated condition. A complex condition formed by

applying the binary operator AND or OR to two conditions (either of which can be

simple or parenthetical) is called a combined condition.

Negated Conditions

simple-condition

is described in Simple Conditions.

condition

is a simple or complex condition.

The truth value of a negated condition is the opposite of the truth value of the operand

condition.

You do not need to use parentheses when you use either AND or OR exclusively in a

combined condition. When you use a mixture of AND, OR, and NOT, you can use

parentheses to effect a final truth value.

Table 8-17. Logical Operators

Operator

MeaningSymbol Kind

NOT Unary Logical negation (reversal of truth value): The truth value is TRUE if the

condition is FALSE, FALSE if the condition is TRUE

AND Binary Logical conjunction: The truth value is TRUE if both conjoined

conditions are TRUE, FALSE if one or both conjoined conditions are

FALSE

OR Binary Logical inclusive OR: The truth value is TRUE if one or both included

conditions are TRUE, FALSE if both included conditions are FALSE

NOT

simple-condition

condition

( )

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