#import <Foundation/Foundation.h>

int main (int argc, const char *argv[]) 
{
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 
   NSString *favoriteComputer;      // favorite computer
   
   favoriteComputer = @"iBook";
   favoriteComputer = @"MacBook Pro";
   int len = [favoriteComputer length];
   
   NSLog(@"%@", favoriteComputer);
   
   favoriteComputer = [favoriteComputer uppercaseString];
   NSLog(@"%@", favoriteComputer);
   
   NSLog(@"The length of the string is %d.", len);
   
   NSMutableString *name;        // name
   
   name = [@"John" mutableCopy];
   [name appendString:@" Doe"];
   NSLog(@"The full name is %@.", name);
   
   NSMutableString *foo = [@"Julia!" mutableCopy]; 
   NSMutableString *bar = foo; 
   NSLog(@"foo points to the string: %@.", foo);
   NSLog(@"bar points to the string: %@.", bar);
   NSLog(@"\n");
   [foo appendString:@" I am happy"];
   NSLog(@"foo points to the string: %@.", foo);
   NSLog(@"bar points to the string: %@.", bar);
 
   [pool release];
   return 0;
}// end of main