mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
943 B
41 lines
943 B
6 months ago
|
## Factorial
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
In a file named `Factorial.java` write a function `factorial` that calculates the factorial of a non-negative integer given as a parameter.
|
||
|
|
|
||
|
|
> 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.
|
||
|
|
|
||
|
|
> Note: The factorial of 0 is 1, according to the [convention](https://www.chilimath.com/lessons/intermediate-algebra/zero-factorial/)
|
||
|
|
|
||
|
|
### Expected Functions
|
||
|
|
|
||
|
|
```java
|
||
|
|
public class Factorial {
|
||
|
|
public static Integer factorial(Integer n) {
|
||
|
|
// your code here
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
### Usage
|
||
|
|
|
||
|
|
Here is a possible `ExerciseRunner.java` to test your function :
|
||
|
|
|
||
|
|
```java
|
||
|
|
public class ExerciseRunner {
|
||
|
|
public static void main(String[] args) {
|
||
|
|
System.out.println(Factorial.factorial(3));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
and its output :
|
||
|
|
|
||
|
|
```shell
|
||
|
|
$ javac *.java -d build
|
||
|
|
$ java -cp build ExerciseRunner
|
||
|
|
6
|
||
|
|
$
|
||
|
|
```
|