Basic OOP

gistfile1.m

//
//  main.m
//  W1D4
//
//  Created by Ian MacKinnon on 2015-01-15.
//  Copyright (c) 2015 Ian MacKinnon. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Student : NSObject

-(int) howManyHoursOfSleep;
-(int) howManyActualHoursOfSleep:(int)claimed;
-(void) sayHello;

@end

@implementation Student

-(void) speakFromHeart{
    NSLog(@"It's week 5 and I question reality");
}

-(int) howManyHoursOfSleep{
    [self speakFromHeart];
    return 6;
}

-(int) howManyActualHoursOfSleep:(int)claimed{
    return claimed + 2;
}

-(void) sayHello{
    NSLog(@"Hello, I got %d hours of sleep last night", [self howManyHoursOfSleep]);
}

@end

@interface CoolStudent : Student

@end

@implementation CoolStudent

    -(void) sayHello{
        NSLog(@"'sup, I got %d hours of sleep last night", [self howManyHoursOfSleep]);
    }
@end

int main(int argc, const char * argv[]) {
        // insert code here...
        Student *student = [[CoolStudent alloc] init];
        [student sayHello];
        
    return 0;
}