Write a program to find the factorial of a number using recursion in java

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Hello guys, welcome to Lingarajtechhub.com. Today we are going to discuss find the factorial of a number using recursion in java

        package com.recursion.java;
        import java.util.Scanner;

         public class Factorial_no {
	     public static void main(String args[ ] )  
                     Int n,fact=1;                                                                  
	                 Scanner Sc=new Scanner(System.in);
	                 System.out.println("enter n");
	                 n=Sc.nextInt( );
	                 System.out.println("factorial no:"+fact);


 ❖ Package com.recursion.java;

            It is a java package( com.recursion.java) which is a collection of classes and this package is created in a java project .


❖ import java.util.Scanner;

             Scanner is a class in java. util package used for obtaining the input of the primitive types like int, double, etc. and strings .


❖ public class Factorial_no

            *Here  factorial_no is defined as a class which is a template used to create objects and to define object data types and methods . >–and it’s defined as public because it can be accessed anywhere .


 ❖ public static void main(String[] args)

             >>– it is a main method in which we can execute a program //public :it is an access modifier of the main function which must be public so that the JVM which is (Java Virtual Machine)can access and execute this method. 

           //If a method is not public, then access is restricted and its showing error //static is a keyword in which main method has must to be static in which JVM can load the class into memory and call the main method without creating an instance

         //void it means no return type

         //main() is function string[]args : string means collection of characters ,String[] args represents a collection of Strings that are separated by a space and can be typed into the program on the terminal directly


 ❖ int n,fact=1;

        >>– here we declare n  as a variable which is integer type,and fact=1 means 

Consider factorial no equal to 1


 ❖ Scanner sc=new Scanner(System.in);

          >>–it means here scanner is a class and Sc is the instance of the object which is new Scanner.System.in is an argument 


❖ System.out.println(“Enter the value of n “);   

          >>– it means System is a class name and out is an instance of the System println is print a new line .


  •  n=sc.nextInt();

         >>– here n is a variable that we take and Sc is our instance name which is created for an object and nextInt() is a method method of a Scanner object that reads in a string of digits or char and converts them into an int type.


  •  while(n>=1)

   >>while means we are using a while loop and then(n>=1) means the value of n is greater or equal to 1.


  •   fact=fact*n;


>>fact=fact*n ;  it is the logic to find out the factorial of a given number.

>>n=n-1;   the value of n is always less than 1.


❖ System.out.println(“factorial no:”+fact);

                >>– it means System is a class name and out is an instance of the System println is print a new line .

      >>– +fact it means it is a concardinate or comma operator.

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Myself Sonalin Shaoo. I am quite happy to contribute here some java programming content and my friends Lipsa Mohanty ,Sushil Puhan, Aswin Kumar Nayak also help me to contribute their Opinion on this .

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