112 113 121 122 131 132...

#include <stdio.h>

int main(void)
{
int i, j, k;

i = 1;

while(i <= 3)
{
j = 1;

printf("\n");
while(j <= 3)
{
k = 1;

while(k <= 3)
{
if((i == j && i != k) ||
(j == i && j != k) ||
(k == i && k != j))
printf("%d%d%d\t", i, j, k);
k++;
}

j++;
}

i++;
}

return 0;
}