Objective - C newbie programming question?

[Chris L]

So I have this book by Kochan, Programming in Objective - C. I was trying to do an excerise, but I just couldn't get it.

Its making a thing where you enter a number, say 893. Then it returns the numbers in order, but in English.
So I enter 893, it returns:
eight
nine
three.

So I got something like it:

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int number, right_digit;
NSLog(@"Type in your integer.");
scanf("%i", &number);

for (right_digit = number % counter ; number > 0; number /= 10, right_digit = number % 10) {
if (right_digit == 0)
NSLog (@"zero");
else if (right_digit == 1)
NSLog (@"one");
else if (right_digit == 2)
NSLog (@"two");
else if (right_digit == 3)
NSLog (@"three");
else if (right_digit == 4)
NSLog (@"four");
else if (right_digit == 5)
NSLog (@"five");
else if (right_digit == 6)
NSLog (@"six");
else if (right_digit == 7)
NSLog (@"seven");
else if (right_digit == 8)
NSLog (@"eight");
else if (right_digit == 9)
NSLog (@"nine");
else
NSLog (@"zero");
}

[pool drain];
return 0;
}

But instead if I enter 893, it returns
three
nine
eight.

I cant reverse it... Maybe there is a way using arrays?
Please help XD Thanks.

 

[Phil]

I too own the book (great book) and an array is possible and would be done similar to this.

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSMutableArray *numberArray = [NSMutableArray arrayWithCapacity: 1]; //it will expand as needed

int number;
int right_digit;
int i;

NSLog(@"Type in your integer.");
scanf("%i", &number);


do {
right_digit = number % 10;
[numberArray addObject: [NSNumber numberWithInteger: right_digit]];
number/=10;
} while (number != 0);

int z = [numberArray count];

for(i = z - 1; i <= [numberArray count]; i--)
{
int currentNumber = [[numberArray objectAtIndex: i] integerValue];

switch (currentNumber)
{
case 0:
NSLog(@"zero");
break;
case 1:
NSLog(@"one");
break;
case 2:
NSLog(@"two");
break;
case 3:
NSLog(@"three");
break;
case 4:
NSLog(@"four");
break;
case 5:
NSLog(@"five");
break;
case 6:
NSLog(@"six");
break;
case 7:
NSLog(@"seven");
break;
case 8:
NSLog(@"eight");
break;
case 9:
NSLog(@"nine");
break;
default:
NSLog(@"unknown");
break;
}
}

[pool drain];
return 0;
}

I quickly threw it together it might be a bit messy (sorry), though I tested it and seems to work for your purpose.

Given arrays haven't been discussed yet in the book, your better off doing it with strictly math.

PS: The author of the book has a very active forum with answers to all the exercises and programs for free. http://classroomm.com/objective-c/ it's very handy