Question

JAVA: Create a Factorial application that prompts the user for a number and then displays its factorial. The factorial of a number is the product of all the positive integers from 1 to the number. For example, 5! = 5*4*3*2*1.

Answer 1

//Java program for calculating the factorial using recursion

import java.util.*;

public class factorial {

public static int func (int n) //function for calculating factorial

{

if(n==0||n==1) //base condition of recursion since 0!=1!=1

return 1;

else

return n*func(n-1); // this is recursion condition which says that multiplication will continue till n reaches base condition

}

public static void main(String[] args)

{

int x; //variable for accepting the number whose factorial is to be calculated

Scanner sc=new Scanner(System.in); //object of scanner class

System.out.println("Enter the number whose factorial is to be calculated:");

x=sc.nextInt(); //accepting the number whose factorial is to be calculated

System.out.println(x+"! = "+func(x)); //printing the result

}

}