These lines don't really make sense. NSNumber (like its superclass
NSValue) is immutable. You can't store a different number in one once
you've created it. So there's no need to create one unless you have a
specific number to store. Just don't set the variable at all, and its
value will be nil. (That will let you know if you've set it, too.)
However, more typically you'd just use a regular C numeric type like
'int' or 'double' for a numeric property. That way you don't have to
allocate or release the value, it uses less memory, and it's simpler
to access the value.
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