Exercise 1

[roryc]

After finishing Chapter 4 with no issues, Exercise 1 came as a bit of a surprise. It seems to assume an understanding of octal and hexadecimal notation, which as a programming newbie, I don't have.

Before I continue with the book, should I read up on these areas? And as an extension, could anybody outline their uses in programming (other than for hex colour codes, which I'm familiar with).

Thanks!

[bpedit]

The hex and octal are introduced in ch 4, it seems, just for the sake of completeness when introducing the data type chars. I'm currently in chapter 16 and haven't used these in any code since ch 4.

On the other hand it would be a good idea to, independently of your progress through the text, gain a familiarity with hex notation. This is how memory addresses appear and can be useful if you use some of Xcode's debugging features.

I know too little so far to know the importance or use of octal in Obj-C.

[roryc]

The fact they were included 'just for the sake of completeness' is why the exercise dependent on a knowledge of them seems out of place. Regardless, thanks for the reply! I'll certainly spend some time learning about hex notation.