Java program Fibonacci series

The successive numbers are generated from its previous two state numbers in the series is called Fibonacci series. Initially, the series has first number =0 and second number =1 and third successive number is generated by summing first and second number in the series.

         
        Initial Fibonacci series F has = {0,1} and successive elements are

             3rd element  = 0+1 =2 
                        F = {0,1,2} 
             4th element  = 1+2 =3 
                        F = {0,1,2,3} 
             5th element  = 2+3 =5 
                        F = {0,1,2,3,5} 
 

Pseudocode - Fibonacci series to positive integer N

Read integer N

set variable cF=0, pF=1

Do

1. print cF
2. cF= cF + pF
3. pF=cF-pF

while cF < N

Java Program - Fibonacci series

The Java program generates Fibonacci series of numbers upto given integer N.

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Fibonacci {

 public static void main(String[] args) throws IOException {
  
 InputStreamReader dis =new InputStreamReader ( System.in );
 BufferedReader br =new BufferedReader(dis);
  
     System.out.println("Find Fibonacci series upto a value n");
     System.out.println("Enter the  value ");    
     String  arg1 =br.readLine();     
     int F = Integer.parseInt(arg1);
     
     int cF=0,pF=1;               
     System.out.println("Fibonocci Series :");
     do {
      System.out.print( cF +" ");
      cF= cF + pF;      
      pF=cF-pF;                  
     } while (cF < F );
 }
}

Output

Find Fibonacci series upto a value 

Enter the  value 
15
Fibonocci Series :
0 1 1 2 3 5 8 13