4D v13.4
If...Else...End if
If...Else...End if
The formal syntax of the If...Else...End if control flow structure is:
If(Boolean_Expression)
statements(s)
Else
statement(s)
End ifNote that the Else part is optional; you can write:
If(Boolean_Expression)
statements(s)
End ifThe If...Else...End if structure lets your method choose between two actions, depending on whether a test (a Boolean expression) is TRUE or FALSE.
When the Boolean expression is TRUE, the statements immediately following the test are executed. If the Boolean expression is FALSE, the statements following the Else statement are executed. The Else statement is optional; if you omit Else, execution continues with the first statement (if any) following the End if.
` Ask the user to enter the name
$Find:=Request(Type a name)
If(OK=1)
QUERY([People];[People]LastName=$Find)
Else
ALERT("You did not enter a name.")
End ifTip: Branching can be performed without statements to be executed in one case or the other. When developing an algorithm or a specialized application, nothing prevents you from writing:
If(Boolean_Expression)
Else
statement(s)
End ifor:
If(Boolean_Expression)
statements(s)
Else
End if
Product: 4D
Theme: Language definition
Case of...Else...End case
Control Flow
For...End for
Repeat...Until
While...End while
