% You are given an array x of real numbers, indexed from 0 to n-1

  int i = 0;
  while (i < n)
    {
     int j = i+1;
     while (j < n)
       {
        if (x[i] > x[j])
         {
          real y = x[i];
          x[i] = x[j];
          x[j] = y;
         }
        j++;
       }
     i++;
    }