Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N

In the previous article we have discussed about Java Program to Print the Series 1 2 9 28 65 N

In this article we are going to see how to print the Fibonacci series by using Java programming language. Observe, 1 1 2 3 5 8 Pattern In Java, 1+1+2+3+5+8 Java Program, Fibonacci Series Logic In Java, 0 1 2 3 6 Series In Java, 1+(1*2)+(1*2*3) Java Program, Fibonacci Series In Java Using Scanner, 0 1 1 2 3 5 In Java, 1 2 2 3 3 3 Pattern In Java, Fibonacci Series In Java Using While Loop.

Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N

On observing the pattern carefully, we can see 1^st and 2^nd number is 1, 1

Then the next number follows a logic by adding with the previous 2 numbers.

1
1
1+1 = 2
2+1 = 3
3+2=  5 …. and so on.

Example:

……

Let’s see different ways to print Fibonacci series.

By Using For Loop
By Using While Loop
By Using User Defined Method

Method-1: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using For Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘a’, ‘b’ and initialize it to 1, 1 respectively.
Use a for loop from i=1 to i<=n-2 where the loop is incremented by 1
Inside the for loop we will find the value of c where c=a+b, now after getting the third term now a becomes b and b becomes c and then the loop continues till it is terminated.
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        int a = 1, b=1;
        System.out.print(a+" "+b);
        //for loop to print the series
        for (int i = 1; i <= n-2; i++) 
        {
            int c = a+b;
            a = b;
            b = c;
  	        System.out.print(" "+c);
        } 
    }
}

Output:

Enter the Nth term “N” 
5
1 1 2 3 5

Method-2: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using While Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘a’, ‘b’ and initialize it to 1, 1 respectively.
Declare and initialize an integer variable i=1
Continue a while loop till i<=n-2, where i is incremented by 1.
Inside the while loop we will find the value of c where c=a+b, now after getting the third term now a becomes b and b becomes c and then the loop continues till it is terminated.
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        int a=1, b=1;
        System.out.print(a+" "+b);
        int i=1;
        while(i<=n-2)
        {
            int c = a+b;
            a = b;
            b = c;
  	        System.out.print(" "+c);
            i++;
        }      
    }
}

Output:

Enter the Nth term “N” 
7
1 1 2 3 5 8 13

Method-3: Java Program to Print the Fibonacci Series 1 1 2 3 5 8 13 …N By Using User Defined Method

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Then call a user defined method say printSeries() by passing n as parameter.
Inside method declare an integer variable say ‘a’, ‘b’ and initialize it to 1, 1 respectively.
Use a for loop from i=1 to i<=n-2 where the loop is incremented by 1
Inside the for loop we will find the value of c where c=a+b, now after getting the third term now a becomes b and b becomes c and then the loop continues till it is terminated.
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // creating object of scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the value of Nth term 'N' ");
        int n = s.nextInt();
        // calling printSeries method to print the series
        printSeries(n);
    }
    
    //printSeries method to print the series
    public static void printSeries(int n)
    {
        int a=1, b=1;
        System.out.print(a+" "+b);
        //for loop to print the series
        for (int i = 1; i <=n-2; i++) 
        {
            int c = a+b;
            a = b;
            b = c;
  	        System.out.print(" "+c);
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
9
1 1 2 3 5 8 13 21 34

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