Object-Oriented C Version Hello World Example

#import <stdio.h>
#import <objc/Object.h> 
 
@interface Hello : Object
{
}
- hello;
@end 
 
@implementation Hello
- hello
{
   printf("Hello, world!\n");
}
@end 
 
int main(void)
{
   id obj;
   obj = [Hello new];
   [obj hello];
   [obj free];
   return 0;
}