How to display two random non-repeating numbers in SI?

Question

random numbers

How to display two random non-repeating numbers in SI in the range from 0 to 10?

srand(time(NULL));
int a = rand()%9;
int b = rand()%9;

Here the numbers are random, but can be repeated

Answer 1

The simplest algorithm is this: generate a number, remember it, at the next generation check whether the number is equal to the previous one, if yes, generate it again, if not, output it.