Write a script which prints all the odd numbers. Output: 1 3 5 7 9 …

I used while loop in this script with if conditional statement within while. Here I used Mod (%) in if and get results till 55. try this code.
Script to print all odd numbers. 

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                          <?php  
                               $num=0;  
                while ($num<=55)  
                               {  
                                         if ($num % 2 == 1)  
                                         {  
                                          echo $num . "<br />";  
                                         }  
                                    $num++;  
                               }  
                          ?>