Logical Operators

You can combine several logical expressions together in one single expression by using the logical link operators AND and OR:

1. To combine several logical expressions together in one single expression which is true only if 
2. all of the component expressions are true, link the expressions with AND.  
3. To combine several logical expressions together in one single expression which is true if at least one of the component expressions is true, link the expressions with OR. 
4. To negate the result of a logical expression, NOT operator can be used. 

Example:

DATA: F TYPE F VALUE '100.00', 

N(3) TYPE N VALUE '123', 

C(3) TYPE C VALUE '456'. 

WRITE 'The following logical expression is true:'. 

IF ( C LT N ) AND ( N GT F ). 

  WRITE: / '(',C,'lt',N,') AND (',N,'gt',F,')'. 

ELSE. 

  WRITE: / '(',C,'ge',N,') OR (',N,'le',F,')'. 

ENDIF. 

The output is: 

The following logical expression is true: 

( 456 ge 123 ) OR ( 123 le  1.000000000000000E+02 ) 

The logical expression in the IF statement is true, and the inverted expression is displayed.