Call
 
Statement to invoke a subroutine

Syntax

Call procname ([parameter list])

Description

Calls a Sub or Function.

This keyword is a holdover from earlier dialects of BASIC, and is mainly deprecated.

In -lang 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

Example

'' Compile with -lang qb or -lang fblite

Declare Sub foobar(ByVal x As Integer, ByVal y As Integer)
Call foobar(35, 42)

Sub foobar(ByVal x As Integer, ByVal y As Integer)
Print x; y
End Sub


'' Compile with -lang qb or -lang fblite

Function f ( ) As Integer
f = 42
End Function

Call f ' execute function f, but ignore the answer


'' Compile with -lang qb

Call mysub(15, 16) '' call "mysub" before it has been declared, or even mentioned.

Sub mysub(ByRef a As Integer, ByRef b As Integer)
    
    Print a, b
    
End Sub


Dialect Differences

  • The use of Call is not allowed in the -lang fb dialect.
  • The -lang fblite 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