Question

How do you declare, set properties, synthesize, and implement an int array of size 5 in Objective C? I’m writing this code for an iphone app. Thanks.

Answer 1

I think the “Cocoa-y” thing to do is hide the int array even if you use it internally. Something like:

@interface Lottery : NSObject {
    int numbers[5];
}

- (int)numberAtIndex:(int)index;
- (void)setNumber:(int)number atIndex:(int)index;
@end

@implementation Lottery

- (int)numberAtIndex:(int)index {
    if (index > 4)
        [[NSException exceptionWithName:NSRangeException reason:[NSString stringWithFormat:@"Index %d is out of range", index] userInfo:nil] raise];
    return numbers[index];
}

- (void)setNumber:(int)number atIndex:(int)index {
    if (index > 4)
        [[NSException exceptionWithName:NSRangeException reason:[NSString stringWithFormat:@"Index %d is out of range", index] userInfo:nil] raise];
    numbers[index] = number;
}