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Ace the AP Computer Science Exam for High Schoolers

Example 1: The Factorial of a Number

Explore how to calculate the factorial of a number using recursion in Java. This lesson helps you understand base cases and the recursive process to break down problems step-by-step.

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This section covers some common examples of recursion. Go through them, one by one, to get a firm grasp on recursion.

The factorial of a number

The factorial of a number, nn, is the product of all the integers from 1 to nn. It is denoted as: n!n!.

n!=n∗(n−1)∗(n−2)∗...∗1n! = n*(n-1)*(n-2)*...*1

For example:

5!=5∗4∗3∗
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