gistfile1.m

#import <Foundation/Foundation.h>

@interface Vehicle : NSObject
- (void) move;
@end;

@implementation Vehicle
- (void) move {
    NSLog(@"I move");
}
@end

@interface Ship : Vehicle
- (void)shoot;
@end

@implementation Ship
- (void) shoot {
    NSLog(@"I shoot");
}
@end




int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        // insert code here...
        NSLog(@"Hello, World!");
        Ship *s = [[Ship alloc] init];
        
        [s shoot];
        [s move];
        
        Vehicle* v = s;
        [v shoot];     // on the stanford course, they said this would just make an warning/ not compile error that you CAN'T ignore. BTW: This should work, since "v" is realy Ship.
       
        
    }
    return 0;
}