Iphone面试题

6. 写一个NSString类的实现 + (id)initWithCString:(const char *)nullTerminatedCString encoding:(NSStringEncoding)encoding; + (id) stringWithCString: (const char*)nullTerminatedCString 
            encoding: (NSStringEncoding)encoding
{
  NSString  *obj;   obj = [self allocWithZone: NSDefaultMallocZone()];
  obj = [obj initWithCString: nullTerminatedCString encoding: encoding];
  return AUTORELEASE(obj);
}