Class & Recursion

//FIRST EXAMPLE

public class Recursion {
    public static void printMe()
    {
        System.out.println("Printing...");
        printMe();
    }

    public static void main(String[] args) {
        printMe();
    }
}

//SECOND EXAMPLE

public class Recursion {
    public static void printMe(String s)
    {
        System.out.println(s);
        printMe(s.substring(1));
    }

    public static void main(String[] args) {
        printMe("This is my string");
    }
}

//THIRD EXAMPLE

public class Recursion {
    public static void printMe(String s)
    {
        if(s.length()>0)
        {
            System.out.println(s);
            printMe(s.substring(1));
        }
    }

    public static void main(String[] args) {
        printMe("This is my string");
    }
}


//RECTURSION WITH VALUE

public class Recursion {
    public static int sum(int n)
    {
        if(n<1)
            return 0;
        else
        {
            return n+sum(n-1);
        }
    }

    public static void main(String[] args) {
        System.out.println(sum(3));
    }
}

//DOUBLE RECURSION -FIBONACCHI

public class Recursion {
    public static int fibo(int n)
    {
        if(n==1 || n==2)
            return 1;
        int num1 = fibo(n-1);
        int num2 = fibo(n-2);
        return num1 + num2;
    }

    public static void main(String[] args) {
        int n = 7;
        System.out.println("Element number "+n+" is "+fibo(n));
    }
}

//FACTORIAL EXAMPLE

int fact(int n)
{
  int result;
  if(n==1)
    return result;
  else {
        result=fact(n-1)*n;
    return result;
  }
}

//REVERSE A NUMBER

int reverse(int n)
{
 if(n<10)
    System.out.print(n);
 else {
    System.out.print(n%10);
    reverse(n/10);
}


//CLASS FIRST EXAMPLE

class Circle {
 public double x,y;
 public double r;

 public double area(){
  return 3.14*r*r;
}

//CLASS SECOND EXAMPLE

class Dog{
string name;
int age;
public voud bark {
 System.out.println("Woof");
}
Dog(string name,int age){
this.name=name;
this.age=age;
}