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Finding Factorial of a Number in Java

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Finding Factorial of a Number in Java Posted: Aug 13, 2016 9:49 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Finding Factorial of a Number in Java
Feed Title: Instance Of Java
Feed URL: http://feeds.feedburner.com/blogspot/TXghwE
Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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  • One of the famous java interview program for freshers is finding factorial of a number using java program
  • Calculating the factorial of a number using java example program with recursion.

  • Factorial number means multiplication of all positive integer from one to that number.
  • n!=1*2*3.......*(n-1)*n.
  • Here ! represents factorial.
  • Two factorial:   2!=  2*1=2
  • Three factorial: 3!= 3*2*1=6.
  • Four factorial :  4!= 4*3*2*1=24.
  • Five factorial:    5!= 5*4*3*2*1=120.
  • Six factorial:      6!= 6*5*4*3*2*1=720
  • Seven factorial: 7!= 7*6*5*4*3*2*1=5040
  • Eight factorial:   8!= 8* 7*6*5*4*3*2*1=40320.
  • By using loops we can find factorial of given number.
  • Lets how can we find factorial of a number using java program without recursion.

Program #1: Java program to find factorial of a number using for loop


  1. package interviewprograms.instanceofjava;

  3. import java.util.Scanner;

  5. public class FactiorialProgram {

  7. public static void main(String args[]){
  9. Scanner in = new Scanner(System.in);
  10. System.out.println("Enter a number to find factorial");
  12. int n= in.nextInt();
  13. int fact=1;

  15. for (int i = 1; i < n; i++) {
  16. fact=fact*i;
  18. }

  20. System.out.println("Factorial of "+n+" is "+fact);

  22. }
  23. }

Output:

  2. Enter a number to find factorial
  3. 5
  4. Factorial of 5 is 24


Program #2: Java program to find factorial of a number using recursion.

  1. package interviewprograms.instanceofjava;

  3. import java.util.Scanner;

  5. public class FactiorialProgram {

  7. public static void main(String args[]){
  9. Scanner in = new Scanner(System.in);
  10. System.out.println("Enter a number to find factorial");
  12. int n= in.nextInt();
  13. int fact=1;

  15. for (int i = 1; i < n; i++) {
  16. fact=fact*i;
  18. }

  20. System.out.println("Factorial of "+n+" is "+fact);

  22. }
  23. }

Output:


  2. Enter a number to find factorial
  3. 5
  4. Factorial of 5 is 24

Program #3: Java program to find factorial of a number using recursion (Eclipse)

factorial number method java


Read: Finding Factorial of a Number in Java

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