logo CodeStepByStep logo


Language/Type: PHP recursion

Write a recursive function named power that accepts two integers representing a base and an exponent and returns the base raised to that exponent. For example, the call of power(3, 4) should return 34 or 81 . If the exponent passed is negative, throw an Exception.


  • Do not declare any global variables.
  • Do not use any loops; you must use recursion.
  • Do not declare the standard PHP pow function in your solution.
  • Do not use any auxiliary data structures (e.g. arrays) or strings to solve this problem.
Function: Write a PHP function as described, not a complete program.

You must log in before you can solve this problem.

Log In

Need help?

Stuck on an exercise? Contact your TA or instructor.

If something seems wrong with our site, please

Is there a problem? Contact us.