2. Factorial

Grokking the Art of Recursion for Coding Interviews

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2. Factorial

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Problem Statement

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Problem Statement

Calculate the Factorial of a Positive Number Using Recursion.

The factorial of a non-negative integer N, denoted as N!, is the product of all positive integers less than or equal to N. The factorial of 0 is defined as 1.

Here is what the example input/output looks like:

Input	Expected Output	Explanation
Number = 5	Factorial = 120	The factorial of 5 is calculated as 5 _ 4 _ 3 _ 2 _ 1 = 120.
Number = 7	Factorial = 5040	The factorial of 7 is calculated as 7 _ 6 _ 5 _ 4 _ 3 _ 2 _ 1 = 5040.
Number = 1	Factorial = 1	The factorial of 1 is 1 itself.

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Table of Contents

Problem Statement

Try it yourself