Write a Program find factorial using recursion in java - Technology369kk

Factorial using recursion in java

Program 

// Q. Write a Program find Factorial of Number but using recursion methods in Java

import java.io.IOException;         // This line for find error

import java.io.BufferedReader;      

import java.io.InputStreamReader;   // This line for Accept Input

class factRecursion{

    public static void main(String arg[])throws

    NumberFormatException,IOException{

        System.out.print("Enter an Integer to calculate it's factorial: ");

// Get Input from the User  

        BufferedReader br= new BufferedReader(new InputStreamReader(System.in));

        int num = Integer.parseInt(br.readLine());

// Call the recursive funtions to generate factorial

        int result = fact(num);

        System.out.println(" \nFactorial of " +num+ " is:- "+result);

    }

// function of factorial

    static int fact(int f){

        if(f <= 1){         //If the number is 1 return 1

            return 1;

        }

        else{

            return f * fact(f-1);       // else call the same function with the value -1

        }  

    }

}

Output:

PS D:\Learning File\BCA\BCA 3rd Sem\JAVA OOP\allpraque> java factRecursion

Enter an Integer to calculate it's factorial:5

 

Factorial of 5 is:- 120