Recursion

When a function calls itself it is known as recursion.

Program to find factorial of no using recursion

public class FactorialUsingRecursion {
    public static void main(String[] args) {
        System.out.println(fact(5));
    }

    static int fact(int num){
        if(num == 0){
            return 1;
        }

        return num * fact(num - 1);
    }
}