User Defined Types and Functions

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Neo Genesis10
 #1
When a variable is passed by reference any changes to the variable are kept when the function exits. In some small way its the same as using a global. The following psuedo (Blitz / VB hyrbid ) functions should make things clearer...

ammo = 47
ShootWeapon( ammo )
; ammo now equals 46

Function ShootWeapon( byREF ammo )
	ammo = ammo - 1	; Actually changes the value
	MakeBullet
End Function

ammo = 47
ammo = ShootWeapon( ammo )

Function ShootWeapon( byVAL ammo )
	MakeBullet
	Return ammo - 1	; Has to return the value
End Function

Hope it makes things clearer...