dog.h

#import <Cocoa/Cocoa.h>                                                         

@interface Dog : NSObject {                                                     
        NSString *name;                                                         
        NSString *color;                                                        
        NSString *hair;                                                         
        NSString *size;                                                         
        NSString *breed;                                                        
}                                                                               
                                                                                
@property (nonatomic, copy) NSString *name;                                     
@property (nonatomic, copy) NSString *color;                                    
@property (nonatomic, copy) NSString *size;                                     
@property (nonatomic, copy) NSString *hair;                                     
@property (nonatomic, copy) NSString *breed;                                    
                                                                                
- (void) description;                                                           
- (void) speak:(NSString *)bark;                                                
@end                       

dog.m

#import "Dog.h"                                                                 
                                                                                
@implementation Dog                                                             
@synthesize name, hair,size, breed, color;                                      
                                                                                
- (void) description                                                            
{                                                                               
        NSLog(@"%@ is a %@ %@ %@ haired %@.", name, size, color, hair,          
breed);                                                                         
}                                                                               
                                                                                
- (void) speak:(NSString *)bark                                                 
{                                                                               
        NSLog(@"%@ says \"%@\"!", name, bark);                                  
}                                                                               
@end                       

main.m

main.m:                                                                         
                                                                                
#import <Foundation/Foundation.h>                                               
#import "Dog.h"                                                                 
                                                                                
int main (int argc, const char * argv[]) {                                      
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];                 
                                                                                
        Dog *puppy = [[Dog alloc] init];                                        
        [puppy setName:@"Lucky"];                                               
        [puppy setColor:@"black"];                                              
        [puppy setSize:@"big"];                                                 
        [puppy setBreed:@"Australian Shepherd"];                                
        [puppy setHair:@"long"];                                                
                                                                                
        [puppy description];                                                    
        [puppy speak:@"Woof"];                                                  
        [puppy speak:@"Squeaky Wheel"];                                         
                                                                                
   [pool drain];                                                                
   return 0;                                                                    
}                                                                               

[Session started at 2009-05-05 10:04:50 -0700.]                                 
2009-05-05 10:04:50.819 pet2[5646:10b] Lucky is a big black long haired         
Australian Shepherd.                                                            
2009-05-05 10:04:50.824 pet2[5646:10b] Lucky says "Woof"!                       
2009-05-05 10:04:50.824 pet2[5646:10b] Lucky says "Squeaky Wheel"!              
                                                                                
The Debugger has exited with status 0.