JavaAlgorithms/Others/FibbonaciSeries.java

package Others;

import java.util.Scanner;

/**
 * Fibonacci sequence, and characterized by the fact that every number after the first two is the
 * sum of the two preceding ones.
 *
 * <p>Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21,...
 *
 * <p>Source for the explanation: https://en.wikipedia.org/wiki/Fibonacci_number
 *
 * Problem Statement: print all Fibonacci numbers that are smaller than your given input N 
 */
public class FibbonaciSeries {
  public static void main(String[] args) {
    // Get input from the user
    Scanner scan = new Scanner(System.in);
    int n = scan.nextInt();
    int first = 0, second = 1;
    scan.close();
    while (first <= n) {
      // print first fibo 0 then add second fibo into it while updating second as well
      System.out.println(first);
      int next = first + second;
      first = second;
      second = next;
    }
  }
}