#import <myClass.h> @import Foundation // Single line comments /*  * Multi line comment  */ int main (int argc, const char * argv[]) {  NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];  NSLog(@"Storage size for int : %d \n", sizeof(int));  NSLog (@"hello world");  if (NO)  {  NSLog(@"I am never run");  } else if (0)  {  NSLog(@"I am also never run");  } else  {  NSLog(@"I print");  }  [pool drain];  return 0; } @implementation MyClass {  long distance;  NSNumber height; }