TAL Reference Manual

Expressions
TAL Reference Manual—526371-001
4-12
Conditional Expressions
Conditional Expressions
A conditional expression is a sequence of conditions and Boolean or relational
operators that establishes the relationship between values. You can use conditional
expressions to direct program flow.
condition
is an operand in a conditional expression. condition can consist of one or more of
the following syntactic elements:
Relational expression
Group comparison expression
(conditional expression)
Arithmetic expression
Relational operator
AND
is a Boolean operator that produces a true state if both adjacent conditions are
true.
OR
is a Boolean operator that produces a true state if either adjacent condition is true.
NOT
is a Boolean operator that tests the condition for a false state.
VST0404.vsd
condition
NOT
AND
OR NOT
condition