Fix loop

I made this loop, but how do I make it so it doesn't output numbers below 0 or over 10?

It asks for a user to input a number 1-10 earlier and then randoms a 0 or 1. If a 0 then add 0.5, if a 1 then subtract 0.5. Thanks I am just stuck after messing with it for hours. Pretty new to C++

Code:

srand(time(0));  //seed the random number
for(int i=1; i<=12; i++) //12 iterations starting from 1
{
  randomizer = rand() % 2;
  if (randomizer == 0)
  {
    selection = selection + 0.5;
    cout << selection << endl;
  } 
  else
  {
    selection = selection - 0.5; 
     cout << selection << endl;
  }

Code:

If (selection > 10 || selection < 0) 
    do something;