4D v13.4

Logical Operators

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4D v13.4
Logical Operators

Logical Operators  


 

 

4D supports two logical operators that work on Boolean expressions: conjunction (AND) and inclusive disjunction (OR). A logical AND returns TRUE if both expressions are TRUE. A logical OR returns TRUE if at least one of the expressions is TRUE.

4D also provides the Boolean functions True, False, and Not. For more information, see the descriptions of these commands.

The following table shows the logical operators:

OperationSyntaxReturnsExpressionValue
ANDBoolean & BooleanBoolean("A" = "A") & (15 # 3)True
("A" = "B") & (15 # 3)False
("A" = "B") & (15 = 3)False
ORBoolean | BooleanBoolean("A" = "A") | (15 # 3)True
("A" = "B") | (15 # 3)True
("A" = "B") | (15 = 3)False

The following is the truth table for the AND logical operator:

Expr1Expr2Expr1 & Expr2
TrueTrueTrue
TrueFalseFalse
FalseTrueFalse
FalseFalseFalse

The following is the truth table for the OR logical operator:

Expr1Expr2Expr1 | Expr2
TrueTrueTrue
TrueFalseTrue
FalseTrueTrue
FalseFalseFalse

Tip: If you need to calculate the exclusive disjunction between Expr1 and Expr2, evaluate:

 (Expr1|Expr2) & Not(Expr1 & Expr2)

 
PROPERTIES 

Product: 4D
Theme: Operators

 
SEE ALSO 

Bitwise Operators
Comparison Operators
Date Operators
Numeric Operators
Operators
Picture Operators
String Operators
Time Operators