Computer scienceProgramming languagesJavaCode organizationFunctional programmingFunctional streams

Reduction methods

Theory

Calculating factorials

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Many java developers wrote methods to calculate a factorial value using a recursive or iterative algorithm. It's time to do it with streams.

The factorial of n is calculated by the product of integer number from 1 to n (inclusive). The factorial of 0 is equal to 1.

Important. Use the given template for your factorial method. Pay attention to type of an argument and the returned value. Please, don't use cycles or recursion.

Sample Input 1: 

0

Sample Output 1: 

1

Sample Input 2: 

1

Sample Output 2: 

1

Sample Input 3: 

2

Sample Output 3: 

2
Write a program in Java 17
import java.util.Scanner;
import java.util.stream.*;

class Main {

/**
* Calculates the factorial of the given number n
*
* @param n >= 0
*
* @return factorial value
*/
public static long factorial(long n) {
// write your code here
}

// Don't change the code below
public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

long n = Integer.parseInt(scanner.nextLine().trim());

System.out.println(factorial(n));
}
}
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