# Fibonacci series using while loop

In this post, you will learn how to find the **Fibonacci series** using the **while loop**.

The **Fibonacci series** is the sequence of numbers in which the next number is the sum of the two previous numbers. The Fibonacci series was well-known hundreds of years earlier. The "**Fibonacci**" name came from the nickname "**Bonacci**".

We can easily remember the Fibonacci sequence using the **Fibonacci Day**, which is November 23rd. As 23rd November has the digits "1, 1, 2, 3" which is part of the sequence.

## Fibonacci Series Program in PHP using while loop

In the given **PHP** program, we have used the **while loop** to print the **Fibonacci series** upto 15 in PHP. First, we print the first and second numbers. Then we use the while loop, where we get the next number by adding the previous two numbers and simultaneously swap the first number with the second and the second with the third.

```
<?php
$n = 0;
$a = 0;
$b = 1;
echo "Fibonacci series upto 15 : ";
echo "$a, $b";
while ($n < 16 )
{
$c = $b + $a;
echo ", ";
echo "$c";
$a = $b;
$b = $c;
$n = $n + 1;
}
?>
```

**Output of the above code:**

`Fibonacci series upto 15 : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597 `

## Python program to find the Fibonacci Series using while loop

In this **Python** program, we have used the while loop to find the Fibonacci Series numbers within that range.

```
num = int(input("Enter the Fibonacci Number Range: "))
n1 = 0
n2 = 1
Sum = 0
i = 0
while(i < num):
print(n1, end = ' ')
Sum = Sum + n1
Next = n1 + n2
n1 = n2
n2 = Next
i = i + 1
print("\nSum of Fibonacci Series Numbers: %d" %Sum)
```

**Output of the above code:**

```
Enter the Fibonacci Number Range: 12
0 1 1 2 3 5 8 13 21 34 55 89
Sum of Fibonacci Series Numbers: 232
```

## Fibonacci series program in Java using while loop

Here, you will learn how to print the **Fibonacci series** using the **while loop** in the **Java** programming language. In the below code, **n1** contains the first number, i.e., 0 and **n2** contains the second number, i.e., 1 and **n** contains the total Fibonacci series number count. In each iteration of the while loop, we get the next number by adding the previous two numbers, and simultaneously, we swap the first number with the second and the second with the third.

```
public class FibonacciSeries{
static void fibonacciSeries(int n)
{
int n1 = 0, n2 = 1;
int counter = 0;
while (counter < n) {
// Print the number
System.out.print(n1 + " ");
int n3 = n2 + n1;
n1 = n2;
n2 = n3;
counter = counter + 1;
}
}
// Driver Code
public static void main(String args[])
{
// initialize number n
int n = 13;
// Call function
fibonacciSeries(n);
}
}
```

**Output of the above code:**

```
0 1 1 2 3 5 8 13 21 34 55 89 144
```

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