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  1. Practice
  2. Tutorials
  3. 30 Days of Code
  4. Day 9: Recursion 3

Day 9: Recursion 3

Objective
Today, we're learning and practicing an algorithmic concept called Recursion. Check out the Tutorial tab for learning materials and an instructional video!

Recursive Method for Calculating Factorial

Task
Write a factorial function that takes a positive integer, as a parameter and prints the result of ( factorial).

Note: If you fail to use recursion or fail to name your recursive function factorial or Factorial, you will get a score of .

Input Format

A single integer, (the argument to pass to factorial).

Constraints

  • Your submission must contain a recursive function named factorial.

Output Format

Print a single integer denoting .

Sample Input

3

Sample Output

6

Explanation

Consider the following steps:

From steps and , we can say ; then when we apply the value from to step , we get . Thus, we print as our answer.