RosettaCodeData/Task/Inheritance-Single/Objective-C/inheritance-single.m

@interface Animal : NSObject
{
  // ...
}
// ...
@end

@interface Dog : Animal
{
  // ...
}
// ...
@end

@interface Lab : Dog
{
  // ...
}
// ...
@end

@interface Collie : Dog
{
  // ...
}
// ...
@end

@interface Cat : Animal
{
  // ...
}
// ...
@end