C ++ Week 3 program

Assignment (Chapter 15):
Write a recursive function to generate the following pattern of stars:
     *
   * *
  * * *
 * * * *
  * * *
   * *
    *
Also, write a program that prompts the user to enter the number of lines in the pattern and uses the recursive function to generate the pattern. For example, specifying 4 as the number of lines generates the above pattern.