Thread: Check for repeated digits!

OK this code works to display one of the numbers that would be repeated. However I need to display all the numbers that may be repeated. Would I need to incorporate a printf function somewhere in the loop?

Code:

#include <stdio.h>

#define TRUE 1
#define FALSE 0

typedef int Bool;

main ()
{
	Bool digit_seen[10] = {0};
	int digit = 0;
	int display_digit = 0;
	long int n = 0;

	printf("Enter a number: ");
	scanf("%ld", &n);

	while (n > 0) 
	{
		digit = n % 10;
		if (digit_seen[digit])
		{
			display_digit = digit;
			break;
		}
		digit_seen[digit] = TRUE;
		n /= 10;
	}

	if (n > 0)
		printf ("Digits repeated are: %ld\n\n", display_digit);
	else
		printf("No repeated digit\n\n");

	return 0;

}