combination123.c

#include <stdio.h>

void main()
{
	int a, b, c;
	printf("Combinations of 1, 2 and 3 are:");
	for (a = 1; a <= 3; a++)
	{
		for (b = 1; b <= 3; b++)
		{
			for (c = 1; c <= 3; c++)
			{
				if (a != b && b != c && c != a)
					printf("\n  %d%d%d", a, b, c);
			}
		}
	}
}