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 1st and 2nd 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:
1 | 1 | 2 | 3 | 5 | 8 | …… | N |
Let’s see different ways to print Fibonacci series.
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
wherec=a+b
, now after getting the third term nowa
becomesb
andb
becomesc
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
, wherei
is incremented by 1. - Inside the while loop we will find the value of
c
wherec=a+b
, now after getting the third term nowa
becomesb
andb
becomesc
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 passingn
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
wherec=a+b
, now after getting the third term nowa
becomesb
andb
becomesc
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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