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Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
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Notation in 7.5
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Topic: Notation in 7.5 (Read 1986 times)
Silent Radar
Newbie
Posts: 3
Notation in 7.5
«
on:
August 05, 2011, 10:03:08 PM »
I understand the concepts being taught, but I got a little lost on the method notation.
I understand that if you use -(double) it will return a double, but where I get a bit lost is in the example we use -(Fraction *) that returns the new Fraction Object that stores the result of adding 2 fractions. I thought that only keywords could be used like (void), (double), etc could only be used.
I'm pretty new to the programming thing and just looking for some clarification.
Thanks
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skochan
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Posts: 3114
Re: Notation in 7.5
«
Reply #1 on:
August 06, 2011, 04:01:05 PM »
You can return any basic C data type (e.g, double, float, int). That also includes a structure or a pointer (indicated by a *). These last two are discussed in more detail in Chapter 13. When you write -(Fraction *), you are specifying that the method will return a pointer. (i.e. reference). It's a pointer to a Fraction object. That means you can return references to any type of object, not just fractions.
Hope this helps,
Steve
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