c++ - Is that possible by only using while loop? -

my tutor gave me assignment have write code contains while loop , prints:

        1       2 1     3 2 1   4 3 2 1  5 4 3 2 1 

i tried 100 times , failed 100 times. due limited knowledge, began think tutor messing brain. if it's possible, please introduce me code prints numbers in order. thanks...

    int = 1;     int limit = 5;     while (i <= limit)     {         int j = 1;         while (j <= limit -i)   //loop print desired space.         {             cout << " ";             j++;         }         int k = i;                      while(k)         {             cout<<k;               //printing digits             k--;         }         cout << endl;         //adding new line character @ end.         i++;     } 

say hello tutor :)