Recursive Series In Java (1) 1/2+(1+1)/2^2+(1+1+2)/2^3+......n terms.(2) 1!/X^2-2!/X^3+......n terms.

Menu driven recursive program to perform.
         (1)  1/2+(1+1)/2^2+(1+1+2)/2^3+......n terms.
         (2) 1!/X^2-2!/X^3+......n terms.
class Recursion{
     public double s1(int N){
         if(N==0)
         return 0;
         else
         return(fibo(N)/Math.pow(2,N)+s1(N-1));
        }//s1
        public double s2(int N,int x){
            if(N==0)
            return 0;
            else if(N%2==1)
            return((fact(N)/Math.pow(x,N+1))+s2(N-1,x));
            else
            return((fact(N)/Math.pow(x,N+1))+s2(N-1,x));
        }//s2
        public static int fact(int n){
            if(n==0)
            return 1;
            else
            return n*fact(n-1);
        }//fact
       public static int fibo(int x){
           if(x==1)
           return 0;
           if(x==2)
           return 1;
           else
           return(fibo(x-1)+fibo(x-2));
        }//fibo
    }//End of class
OUTPUT---
FOR s1 , When Input Is 10
Output is 0.859375
FOR s2 , When Input Is 10 & 10
Output is 0.013195296000000002

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