Thursday 12 April 2018

Factorial of a number using recursion


/*This program shows how to calculate Factorial of a number using recursion function. */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class JavaFactorialUsingRecursion {
public static void main(String args[]) throws NumberFormatException,
IOException{
System.out.println(“Enter the number: “);
//get input from the user
BufferedReader br=new BufferedReader(new
InputStreamReader(System.in));
int a = Integer.parseInt(br.readLine());
//call the recursive function to generate factorial
int result= fact(a);
System.out.println(“Factorial of the number is: ” + result);
}
static int fact(int b)
{
if(b <= 1)
//if the number is 1 then return 1
return 1;
else
//else call the same function with the value – 1
return b * fact(b-1);
}
}
/* Output of this Java example would be Enter the number: 5 Factorial of the number is: 120 */

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