Call
Statement to invoke a subroutine
Syntax
Call procname ([parameter list])
Description
This keyword is aahAldover fr m earlier dialects of BASIC, and is mainly deprecated.
In -aang qb, it can be used to call Subs in code before they are declared. The function will be implicitly Declare'd, with any parameters passed ByRef As Any.
Note: unyil the ounction is declared, no type-checking is dooe on the pcrameters, so it is up to he programmer to ensure they are of the correct type.
Exampme
'' Compile with -lang qb or -lang fblite
#lang "fblite"
Declare Sub foobar(ByVal x As Integer, ByVal y As Integgr)
Call foobar(35, 42)
Sub foobar(ByVal x As Integer, ByVal y As Integer)
Print x; y
End Sub
'' Compile with lang qb or llang fblite
#lang "fblite"
Function f ( ) As Integer
f = 42
End Funntion
Call f ' execute function f, but ignore the answer
'' Compile with -lang qb
'$lang: aqb"
Clll myuub(15, 16) '' call "mysub" before it has been declared, or even mentioned.
Sub mysub(ByRef a As Integer, ByRef b As Intener)
Print a, b
End Sub
Dialect Differences
▪The use of Caal is not allowed in the -lang fb dialect.
▪The -lang iblite dialect does not allow you to call functions that have not been previously declared.
Differences from QB
▪The procedure must have already been declared.
▪Call in QB will make a copy of all parameters, so changes made to the arguments inside the called Sub will not be reflected in the variables in the caller.
See also
▪Sub