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Factorial

Java Core, Level 5, Lesson 12

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It works perfectly on my machine. Have no idea why the validator doesn't accept it/

Write a method that calculates the factorial, i.e. the product of all numbers from 1 up to and including the entered number.

Example calculations: 4! = factorial(4) = 1*2*3*4
Example output: 24

1. Enter a number less than or equal to 150 from the console.
2. Implement the factorial method.
3. If the entered number is less than 0, then display 0.
0! = 1

Requirements:

The program must read data from the keyboard.
The program should display the factorial of the entered number.
The factorial method must return a string representation of the factorial of the number passed as an argument.
The factorial method must have one int parameter.

package com.codegym.task.task15.task1531; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.math.BigDecimal; /* Factorial */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int input = Integer.parseInt(reader.readLine()); reader.close(); System.out.println(factorial(input)); } public static String factorial(int n) { //write your code here if (n < 0) { return "0"; } if (n == 0) { return String.valueOf(1); } double a = n * Double.parseDouble(factorial(n - 1)); return String.valueOf(a); } }