How to print digit by digit of a number?

Question

Possible Duplicate:
Identify the digits in a given number.

I need to print each digit of number without convert it to string. It's possible? For example:

int n = 1234;
int x;

while( ?? ) {
  x = ??
  printf("%d\n", x); 
}

it prints:

I have no idea how to do this. Thanks in advance.

but anyway, the idea was to do this without converting to a string — ControlAltDel, Apr 15 '12 at 00:56
@Jack - You need to understand how to accomplish it.. someone else doing it won't help. I really suggest P&P - paper pencil — Caffeinated, Apr 15 '12 at 00:58

score 3 · Answer 1 · answered Apr 15 '12 at 00:58

3

Unless you tell me this isn't homework, I won't give the full answer.

Note that x / 10 gives you x stripped of the last digit. So 123 / 10 = 12, 45 / 10 = 4, etc.

And note that x % 10 gives you the last digit of x. So 123 % 10 = 3, 45 % 10 = 5, etc.

answered Apr 15 '12 at 00:58

Jesus is Lord

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score 2 · Answer 2 · answered Apr 15 '12 at 00:58

2

This actually touches on number theory / mathematical methods. You can write a number 1234, for example, as 1x10^3 + 2x10^2 + 3x10^1 + 4x10^0. Now think about how you can use % (mod) and / (integer division) to extract each digit.

answered Apr 15 '12 at 00:58

Kevin

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score 2 · Answer 3 · answered Apr 15 '12 at 01:00

2

If you know the maximum number of digits, you can do it using / and %

so for instance, if you want to find the thousands place, the answer is


num =...
int thousands = (num / 1000) % 10

you can actually do this in a loop

answered Apr 15 '12 at 01:00

ControlAltDel

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How to print digit by digit of a number?

3 Answers3