recursion_java, Java

recursion_java

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String[] args) {
//        System.out.println(fib(100));
        System.out.println(fibWithRec(100000));
//        System.out.println(fibWithLoop(100000));
    }

public static long fib(long n) {
        if (n > 1) return fib(n - 1) + fib(n - 2);
        else return n;
    }

public static long fibWithRec(long n) {
        if (n > 1) return fiIter(1, 1, n - 2);
        else return n;
    }

public static long fiIter(long prev, long current, long n) {
        if (n == 0) return current;
        else return fiIter(current, prev + current, n - 1);
    }

public static long fibWithLoop(long n) {
        if(n<=1)return n;

long i=2;
        long prev=1;
        long current=1;
        while (i < n) {
            long next = prev+current;
            prev=current;
            current=next;
            i++;
        }
        return current;
    }
}


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