if (myFloat == nil){
\\Do Method
}
In the above situation, the method will run only if myFloat is nil. Will it also run if myFloat was set to 0?
views:
61answers:
2
A:
Well, nil is technically 0. However, some of this depends on what type of variable myFloat is. If myFloat is a C float, you can't depend on it being exactly 0. You really should be using nil on id types.
BobbyShaftoe
2010-06-17 04:11:08
But what should I use for primitive types like float?
G.P. Burdell
2010-06-17 04:13:37
It depends on what you are doing. If you have a pointer to a float, you can compare to 0. However, you should look at how floating point numbers are represented in a computer.
BobbyShaftoe
2010-06-17 04:31:17
A:
nil only should be used with pointers. Baiscally if says the pointer has not been set to a value.
Floats and other C types just have a value. (Strictly flotas and double possibly can have values like NaN but this is more difficult to manage)
In Objective C you can wrap a float in a class NSNumber. An object of this class is referenced by a pointer so a variable of type NSNumber* can be nil.
Mark
2010-06-17 08:02:11