Print Fibonacci series using Recursive approach in Java

Java Program to Print Fibonacci Series upto K Number.


In this post we will see how to Print Fibonacci series using Recursive approach in Java.
Example: 
Java program to print fibonacci series up to a given number k. 
Input   = 5 Output = 0, 1, 1, 2, 3

Input   = 2
Output = 0, 1

Input   = 7
Output = 0, 1, 1, 2, 3, 5, 8  

Algorithm


Lets explore algorithm to print fibonacci series using Recursive approach,

STEP 1 :
Take 2 variable a and b and initialise it to -1 and 1 respectively.

  •  a = -1
  •  b =  1
STEP 2 :
Add both numbers a & b and store it in temporary variable c.

  • c = a + b
STEP 3 :
Print "c"


STEP 4 :
As we are done working with "a" and "b" which result to new value "c".
In each iteration, we need only 2 values a and b, so we will discard old value from "a", "b" and "c".

Initialise "a" to value of "b" and "b" to value of "c". (older value of "a" is discarded)
  • a = b;
  • b = c;
If we repeat Step 2, Step 3 and Step 4 in loop, It will print Fibonacci sequence.

Java Program to Print Fibonacci series Recursive approach.


public class FibonacciSeries {
 public static void main(String[] args) {
  
  int length = 10;
  
  System.out.println("\nFibonacciSeries Recursive...");
  fibonacciSeriesRecurisve(-1, 1, length);
 }
 
 public static void fibonacciSeriesRecurisve(int a, int b, int length){
  if(length == 0){
   return;
  }
  
  int c = a+b;
  System.out.print(c + ", ");
  fibonacciSeriesRecurisve(b, c, length-1);
 }
}


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Enjoy !!!! 

If you find any issue in post or face any error while implementing, Please comment.

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