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Factorial

Java Core, Level 5, Lesson 12

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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.math.BigInteger; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.lang.String; //import java.math.BigDecimal; import java.math.*; /* 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 number) { if (number <= 1) return BigInteger.ONE.toString(); else // return factorial(number - 1).multiply(BigInteger.valueOf(number)).toString(); return BigInteger.valueOf(number).java.math.BigInteger.multiply(factorial(number-1)).toString(); } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

14 November 2019, 19:05

I think this is the line you are looking for:

return BigInteger.valueOf(number).multiply(BigInteger.valueOf(Long.parseLong
   (factorial(number-1)))).toString();