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41 lines
943 B
41 lines
943 B
7 months ago
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## Factorial
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### Instructions
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In a file named `Factorial.java` write a function `factorial` that calculates the factorial of a non-negative integer given as a parameter.
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> The factorial of a non-negative integer n (denoted as n!) is the product of all positive integers less than or equal to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120.
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> Note: The factorial of 0 is 1, according to the [convention](https://www.chilimath.com/lessons/intermediate-algebra/zero-factorial/)
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### Expected Functions
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```java
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public class Factorial {
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public static Integer factorial(Integer n) {
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// your code here
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}
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}
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```
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### Usage
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Here is a possible `ExerciseRunner.java` to test your function :
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```java
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public class ExerciseRunner {
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public static void main(String[] args) {
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System.out.println(Factorial.factorial(3));
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}
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}
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```
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and its output :
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```shell
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$ javac *.java -d build
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$ java -cp build ExerciseRunner
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6
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$
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```
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