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

#import 

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    int a, b, number, logNum, nThNum;

    NSLog(@"Please enter a valid integer: ");
    scanf("%d", &number); // read input as a decimal integer

    if (!number) // if zero or something other than a number is entered output zero
        NSLog(@"Zero");
    else if (number < 0) { // convert negatives to something that can be used
        number = -number;
        NSLog(@"(negative)"); // but output negative first then continue as usual
    }

    logNum = (log10(number) + 1); // find how many digits there are in the number

    for (int j=0; j < logNum; j++) {// loop based on number of digits
        a = pow(10,logNum-j);
        b = pow(10,logNum-1-j);
        nThNum = (number % a) / b;// find the nth digit in a number, in our case 1st
        switch (nThNum) {// output current digit that was found
            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:
                break;
        }
    }

    [pool drain];
    return 0;
}

Well, now that you've posted your code, your method will work great if you first reverse the number. So, you can just write a short routine to do that, then use your own code.