Re: Strange problem when not declaring the functions in interface

FROM : Ivan S. Kourtev
DATE : Mon Apr 18 22:36:12 2005

The default return type is (id).  If you don't declare the functions
you should do:

i = i + (int)[self foo1];

--
ivan

On Apr 18, 2005, at 4:08 PM, Pradeep Kumar wrote:

>  Hi All
>
>  I am not sure if I am missing something really fundamental or it is
> really a bug. But I have
>  this strange problem that's occurring when functions are not declared
> in the interface.
>  Thought of broadcasting this incase some one has any insight on why
> this is happening.
>
>  Please review the following code snippet. Assume that the functions
> foo1 and foo2 are
>  declared in the interface declaration of MyObject.
>
>  @implementation MyObject
>
>  -(void)awakeFromNib
>  {
>       NSLog(@"[self foo1] returned %d", [self foo1]);
>       NSLog(@"[self foo2] returned %d", [self foo2]);
>       int foo1 = [self foo1];
>       int foo2 = [self foo2];
>       NSLog(@"Variables foo1 = %d\tfoo2 = %d", foo1, foo2);
>       
>       int i = 100;
>       NSLog(@"i = %d", i);
>       
>       i = i+[self foo1];
>       NSLog(@"Executing i = i+[self foo1] = %d", i);
>       i = i+[self foo2];
>       NSLog(@"Executing i = i+[self foo2]; = %d", i);
>  }
>
>  -(int)foo1
>  {
>       return 10;
>  }
>
>  -(int)foo2
>  {
>       return 20;
>  }
>
>  @end
>
>  The result you get in the log is
>
>  [self foo1] returned 10
>  [self foo2] returned 20
>  Variables foo1 = 10     foo2 = 20
>  i = 100
>  Executing i = i+[self foo1] = 110
>  Executing i = i+[self foo2]; = 130
>
>  The results are perfect.
>
>  Now remove the declarations of foo1 and foo2 from the interface file
> of MyObject. After
>  doing this here's what I get.
>
>  [self foo1] returned 10
>  [self foo2] returned 20
>  Variables foo1 = 10     foo2 = 20
>  i = 100
>  Executing i = i+[self foo1] = 410
>  Executing i = i+[self foo2]; = 1660
>
>  See the results of the last two statements. 410 and 1660. Why is this
> happening?
>
>  I am using XCode 1.5 with  Component versions Xcode IDE: 389.0, Xcode
> Core: 387.0,
>  ToolSupport: 372.0 on 10.3.9 (7W98). I know it is recommended that
> functions be declared
>  in the interface. But can not declaring the functions cause such a
> huge difference in ways
>  you can use non-declared functions?
>
>  Thanks
>  prady
>
>
>
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