How to reset counter in loop

Question

Here is my code

        int i = 0;
        while (i < 10)
        {
            i++;
            i = i % 10;
        }

The above code resets

Answer 1

By using this you can reset the value of i to 0 when reaches the limit 10.

int i = 0;
while (i < 10)
{
   i++;
   if(i==10)
   {
      i=0;
   }
}

Answer 2

Your first loop iterates over the numbers 0..9. You can make your code iterate over 9..0 in the same way:

int i = 10;
while (i > -1)
{
    i--;
    i = i % 10;
}

Answer 3

    int i = 10;
    while (true)
    {
        i = (i + 10) % 11;
    }

This would give you:

10 -> 9
9 -> 8
8 -> 7
7 -> 6
6 -> 5
4 -> 3
3 -> 2
2 -> 1
1 -> 0
0 -> 10

Answer 4

Both your loops are while(true) so they play no role in the question.

That leaves: "can I make a count-down roll over without an if?"

The answer is yes, if you realy want to:

 i--;
 i = (i + 10) % 10;