Factorial of the Given Number in Java Example

Factorial Number is the product of natural numbers from one to that particular number.  Mathematically, n! = 1 * 2 * 3 * …. * (n-1) * n

Algorithm for Factorial of the Given Number:

step 1: Set fact= 1

step 2: Read b

step 3: Set c=b

step 4: Repeat through step-6 until (c > 0)

step 5:  fact=fact*c

step 6:  c=c-1

step 7: Print fact

step 8: Exit

Here is the Java Example for Factorial of the Given Number:

import java.util.Scanner;
public class FactorialNumber
{
         public static void main(String ars[])
       {
               int fact=1,b,c;
            Scanner s=new Scanner(System.in);
            System.out.print("Enter A Number for get Factorial : ");
            b=s.nextInt();
            c=b;
            while(c>0)
                  {
                    fact=fact*c;
                            c-- ;
                   }
            System.out.println();
            System.out.println("Factorial of "+b+" is : "+fact);
         }
}
 

/* Factorial Program in Java using BufferedReader */ 
 import java.io.*;
class FactorialBufferedReader
{
    public static void main(String args[] )
    throws IOException
    {
        BufferedReader fact = new BufferedReader(new InputStreamReader (System.in));
        String m;
        int n,s=1,i;
        System.out.print("Enter a Number : ");
        m=fact.readLine();
        n=Integer.parseInt(m);
        for(i=1;i<=n;i++)
        {
            s=s*i;
        }
        System.out.println("Factorial is : "+s);
    }
}