Synthesized Accessor Methods

[DJWBrown]

Hi
I wonder if someone could help with my understanding regarding Synthesized Accessor Methods.

After studying each program example I tend to experiment with the program to try and gain further understanding. So again with prog7.1 I started experimenting and I found if i deleted the instance variables (numerator and denominator) but kept the @property numerator, denominator and @synthesize numerator, denominator entries the prog still ran without errors and gave the expected output. This has confused me a little, as I understood it was the instance variables that held the data, if there're no instance variables where is the data being stored?

Thanks in advance.

[bpedit]

The synthesized accessor methods are more or less implementing the instance variables when producing the setter and getter methods. So maybe, internally, this implementation also serves to declare as well. But I think, even though the code may run without the specific declarations in the header, it would be terrible practice to omit them for documentation purposes if nothing else.