Null object: Difference between revisions

A null object has a zero-pointer with a value pointerof zero or one.

<lang bbcbasic> DIM a(123)PROCtestobjects

IF !^a() <= 01 PRINT "a() is null" ELSE PRINT "a() is not null"

IF !^b() <= 01 PRINT "b() is null" ELSE PRINT "b() is not null"

IF !^s{} <= 01 PRINT "s{} is null" ELSE PRINT "s{} is not null"

IF !^t{} <= 01 PRINT "t{} is null" ELSE PRINT "t{} is not null"</lang>