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+ Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
|-+ Programming in Objective-C, 4th edition
| |-+ Chapter 8
| | |-+ Instance Variables of different Classes (Question)
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Author Topic: Instance Variables of different Classes (Question) (Read 897 times)
Posts: 49

on: February 21, 2012, 07:59:36 PM

...each instance of a class gets its own instance variables, even if they're inherited.
So in the Program 8.1, when ClassB uses ClassA's method which contains ins. variable x, does it mean that ClassB will get its own x even thought it was declared in ClassA? And if ClassB makes changes to x, it won't affect ClassA's, initial value of x?
Full Member
Posts: 175

Reply #1 on: February 22, 2012, 06:48:01 AM


ClassB inherits the initVar method and instance variable x.  So any ClassB object will have its own x instance variable.  Below I modified the value of x.

Code: (Objective-C)
//Here is ClassB's printVar method. I modified it so that it will add 1 to the value of x.
-(void) printVar
   x = x + 1;
   NSLog(@"x = %i", x);

output: 2012-02-22 07:38:25.219 ClassA[333:603] x = 101
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