Java program Factorial Number

A result of series of multiplication from 1 to factorial F is called factorial number F

Factorial Number - Example

  
   
    for example, a factorial number denoted by 5! 
               (postfix exclamation symbol with digits)    

     find equivalent decimal value for given a factorial number 5! 

                   5!  = 1 x 2 x 3 x 4 x 5
                   5!  = 120 
                                   
       

Factorial Number - Pseudocode

Read a positive integer F

set sf = 1

For n= 2 to F

sf = sf * n

End for

print sf

Factorial number - Java code

The Java program finds factorial value for a number. The program reads a positive integer from user while running and returns factorial value as result of the it.

 

import java.io.IOException;
import java.util.Scanner;

public class Factorial 
{

public static void main(String[] args) throws IOException
   {      
      System.out.println("Find a factorial value for given number );
      System.out.println("Enter a value  ");
      Scanner sc = new Scanner(System.in);         
      int F= sc.nextInt();
      sc.close();
     
     int sf=1;     
     for (int n=1; n<=F ; n++) {
      sf *= n;  
     } 
      
     System.out.println("Factorial "+F+"!=" + sf );         
 }

}
 

Factorial number - Java program output

Find a factorial value for given number 

Enter a value  
5
Factorial 5!=120