RosettaCodeData/Task/Function-definition/IWBASIC/function-definition.basic

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'1. Not Object Oriented Program
DECLARE Multiply(N1:INT,N2:INT),INT
DEF A,B:INT
A=2:B=2
OPENCONSOLE
PRINT Multiply(A,B)
PRINT
'When compiled as a console only program, a press any key to continue is automatic.
CLOSECONSOLE
END
SUB Multiply(N1:INT,N2:INT),INT
DEF Product:INT
Product=N1*N2
RETURN Product
ENDSUB
'Can also be written with no code in the subroutine and just RETURN N1*N2.
----
'2. Not Object Oriented Program Using A Macro
$MACRO Multiply (N1,N2) (N1*N2)
DEF A,B:INT
A=5:B=5
OPENCONSOLE
PRINT Multiply (A,B)
PRINT
'When compiled as a console only program, a press any key to continue is automatic.
CLOSECONSOLE
END
----
'3. In An Object Oriented Program
CLASS Associate
'functions/methods
DECLARE Associate:'object constructor
DECLARE _Associate:'object destructor
'***Multiply declared***
DECLARE Multiply(UnitsSold:UINT),UINT
'members
DEF m_Price:UINT
DEF m_UnitsSold:UINT
DEF m_SalesTotal:UINT
ENDCLASS
DEF Emp:Associate
m_UnitsSold=10
Ass.Multiply(m_UnitsSold)
OPENCONSOLE
PRINT"Sales total: ",:PRINT"$"+LTRIM$(STR$(Emp.m_SalesTotal))
PRINT
CLOSECONSOLE
END
'm_price is set in constructor
SUB Associate::Multiply(UnitsSold:UINT),UINT
m_SalesTotal=m_Price*UnitsSold
RETURN m_SalesTotal
ENDSUB
SUB Associate::Associate()
m_Price=10
ENDSUB
SUB Associate::_Associate()
'Nothing to cleanup
ENDSUB