13.38 IF Statement
The IF statement either runs or skips a sequence of one or more statements, depending on the value of a BOOLEAN expression.
Topics
Syntax
if_statement ::=
Semantics
boolean_expression
Expression whose value is TRUE, FALSE, or NULL.
The first boolean_expression is always evaluated. Each other boolean_expression is evaluated only if the values of the preceding expressions are FALSE.
If a boolean_expression is evaluated and its value is TRUE, the statements after the corresponding THEN run. The succeeding expressions are not evaluated, and the statements associated with them do not run.
ELSE
If no boolean_expression has the value TRUE, the statements after ELSE run.
Examples
-
Example 4-1, "IF THEN Statement"
-
Example 4-2, "IF THEN ELSE Statement"
-
Example 4-3, "Nested IF THEN ELSE Statements"
-
Example 4-4, "IF THEN ELSIF Statement"
Related Topics
In this chapter:
In other chapters: