# Converting Digits to Words

Discussion in 'iOS Programming' started by Hexiii, Mar 3, 2012.

1. Mar 3, 2012
Last edited: Mar 3, 2012

### Hexiii macrumors 65816

Joined:
Jun 30, 2011
Location:
Prague, Czech Republic
#1
I am reading the Stephen G. Kochan book about obj-c and in the end of every chapter, there are few exercises to train what have you learned so far.

I am having a little problem with one exercise where I am supposed to write a small program to convert digits to words. (input: 34524, output: three four five two four) I tried searching google but there are just examples for rewriting number to text (1423, one thousand four hundred twenty three).

I only figured out how to rewrite it backwards like (4213, three one two four), but can't figure out how to save the digits from the front to back.

Here's the backwards program:

Code:
```#import <Foundation/Foundation.h>

int main (int argc, char *argv [])

{
@autoreleasepool {

int number, enddigit;

NSLog(@"Type a number");

scanf("%i", &number);

for (; number % 10 != 0; number /= 10){
enddigit = number % 10;
switch (enddigit){
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;

case (0):
NSLog(@"zero");
break;
}
}
}

return 0;

}
```
Thank you for help.

2. ### itickings macrumors 6502a

Joined:
Apr 14, 2007
#2
I don't have the particular book you are using, but I'd guess that the question is from an early part of the book.
If so, you probably shouldn't try to find a way to save the words after converting them from digits, but rather find a way to convert the most significant digit first, and so on.

As for the code as it is now, what happens when you input for example 10 or 100? Or any number containing a zero?

3. ### HannKett macrumors member

Joined:
Feb 25, 2012
Location:
Europe
#3
Kochan has a special forum dedicated to his books:

http://classroomm.com/objective-c/

there you can check how others solve the exercises and discuss other fun stuff.

4. ### Hexiii thread starter macrumors 65816

Joined:
Jun 30, 2011
Location:
Prague, Czech Republic
#4
I know, but I am reading translated book, so the chapters are not the same and I couldn't find the one on that forum.

I will fix that later, I just wanted to show you the general principle.

5. ### HannKett macrumors member

Joined:
Feb 25, 2012
Location:
Europe
#5
Just a friendly tip from another non-english native European, read programming books in English. It makes more sense as most (all?) languages are based on English.

And the excercises should be the same?

6. ### Hexiii thread starter macrumors 65816

Joined:
Jun 30, 2011
Location:
Prague, Czech Republic
#6
Apparently, the are not.