Number75.java

import java.util.*;
public class Number75 {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n;
		System.out.println("Enter a number");
		n=sc.nextInt();
		System.out.println("The double factorial of "+n+" is "+(doFact(n)));
	}
	static int doFact(int n)
	{
		if(n==0||n==1)
			return 1;
		else
			return n*doFact(n-2);
	}
}