# 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 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 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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