How to convert numbers into text?

Question

I have been learning Objective-C with the Kochan book and I can\'t figure out how to do this exercise program. Only odd numbered exercises are listed online and this one is

Answer 1

very easy, there are number of approaches but i normally try this :

  do
    {
         digit = number % 10;
        switch (digit) {
            case 0:
                [self prependNumber:@"zero"];
                break;
            case 1:
                [self prependNumber:@"one"];
                break;
            case 2:
                [self prependNumber:@"two"];
                break;
            case 3:
                [self prependNumber:@"three"];
                break;
            case 4:
                [self prependNumber:@"four"];
                break;
            case 5:
                [self prependNumber:@"five"];
                break;
            case 6:
                [self prependNumber:@"six"];
                break;
            case 7:
                [self prependNumber:@"seven"];
                break;
            case 8:
                [self prependNumber:@"eight"];
                break;
            case 9:
                [self prependNumber:@"nine"];
                break;
            default:
                break;
        }


        number /= 10;
    }
    while (number != 0);

/************/
-(void) prependNumber:(NSString*)str{
 NSLog(str);
}