# How to display fibonacci series in java using loops

##### How to display fibonacci series in java using loops

A fibonacci sequence is a series of numbers where a number is the sum of previous two numbers. Starting with 0 and 1, the sequence goes 0, 1, 1, 2, 3, 5, 8, 13, 21, and so on. Here we will write three programs to print fibonacci series in java

1) using for loop

2) using while loop

3) based on the number entered by user

Examples:

Input: N = 10
Output: 0 1 1 2 3 5 8 13 21 34
Here first term of Fibonacci is 0 and second is 1, so that 3rd term = first(o) + second(1) etc and so on.

Input: N = 15
Output: 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377

Example 1:

Method 1: Program to print fibonacci series using for loop

```public class JavaExample {

public static void main(String[] args) {

int count = 7, num1 = 0, num2 = 1;
System.out.print("Fibonacci Series of "+count+" numbers:");

for (int i = 1; i <= count; ++i)
{
System.out.print(num1+" ");

/* On each iteration, we are assigning second number
* to the first number and assigning the sum of last two
* numbers to the second number
*/
int sumOfPrevTwo = num1 + num2;
num1 = num2;
num2 = sumOfPrevTwo;
}
}
}```

Output:

Fibonacci Series of 7 numbers:0 1 1 2 3 5 8

Example 2:

Method 2: Displaying Fibonacci Sequence using while loop

```public class JavaExample {

public static void main(String[] args) {

int count = 7, num1 = 0, num2 = 1;
System.out.print("Fibonacci Series of "+count+" numbers:");

int i=1;
while(i<=count)
{
System.out.print(num1+" ");
int sumOfPrevTwo = num1 + num2;
num1 = num2;
num2 = sumOfPrevTwo;
i++;
}
}
}```

Output:

Fibonacci Series of 7 numbers:0 1 1 2 3 5 8

Example 3:

This program display the sequence based on the number entered by user. For example – if user enters 10 then this program displays the series of 10 numbers.

Method 3: Program to display the fibonacci series based on the user input
```import java.util.Scanner;
public class JavaExample {

public static void main(String[] args) {

int count, num1 = 0, num2 = 1;
System.out.println("How may numbers you want in the sequence:");
Scanner scanner = new Scanner(System.in);
count = scanner.nextInt();
scanner.close();
System.out.print("Fibonacci Series of "+count+" numbers:");

int i=1;
while(i<=count)
{
System.out.print(num1+" ");
int sumOfPrevTwo = num1 + num2;
num1 = num2;
num2 = sumOfPrevTwo;
i++;
}
}
}```

Output:

How may numbers you want in the sequence: 6 Fibonacci Series of 6 numbers:0 1 1 2 3 5

How to display fibonacci series in java using loops – How to display fibonacci series in java using loops – How to display fibonacci series in java using loops