# What is the Fibonacci series? in java | Displaying the Fibonacci sequence using a loop

Contents

## What is the Fibonacci Series? with example

In this program, we will learn what is Fibonacci series and their example using for loop and while loop.

In the Fibonacci series, the next number is the sum of the previous two numbers. The first two numbers in the Fibonacci series are 0 and 1.

Fibonacci numbers are used significantly in computational run-time studies of algorithms to determine the largest common divisor of two integers. In arithmetic, the Wiethoff array is an infinite matrix of numbers that originates from the Fibonacci sequence.
Fibonacci sequences: 0, 1, 1, 2, 3, 5, 8, 13, 21, …

## Way-1: Java Program to Display Fibonacci Series using while loop

```import java.io. *;
import java.util. *;
public class Fabonacci {

static public void main(String[]sss)
{
int n = 10, a = 0, b = 1;

while (a <= n)
{
System.out.print(a + " ");
int
sum = a + b;
a = b;
b = sum;

}
}
}```

### Output:

```PS C:\Users\Pramod\Desktop\MPS>  c:; cd 'c:\Users\Pramod\Desktop\MPS'; & 'c:\Users\Pramod\.vscode\extensions\vscjava.vscode-java-debug-0.31.0\scripts\launcher.bat' 'C:\Program Files\Java\jdk-15.0.2\bin\java.exe' '--enable-preview' '-XX:+ShowCodeDetailsInExceptionMessages' '-Dfile.encoding=UTF-8' '-cp' 'C:\Users\Pramod\AppData\Roaming\Code\User\workspaceStorage\68adb333e7c4b36a52ea53bc8c24e1ec\redhat.java\jdt_ws\MPS_776f50d0\bin' 'Fabonacci'

0 1 1 2 3 5 8

PS C:\Users\Pramod\Desktop\MPS>```

## Way-2: Java Program to Display Fibonacci Series using while loop

```Public class JavaExample {

public static void main (String [] args) {

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

int i = 1;
While (i <= count)
{
System.out.print (num1 + "");
int sumOfPrevTwo = num1 + num2;
num1 = num2;
num2 = sumOfPrevTwo;
i ++;
}
}
}```
Output:
```PS C:\Users\Pramod\Desktop\MPS>  c:; cd 'c:\Users\Pramod\Desktop\MPS'; & 'c:\Users\Pramod\.vscode\extensions\vscjava.vscode-java-debug-0.31.0\scripts\launcher.bat' 'C:\Program Files\Java\jdk-15.0.2\bin\java.exe' '--enable-preview' '-XX:+ShowCodeDetailsInExceptionMessages' '-Dfile.encoding=UTF-8' '-cp' 'C:\Users\Pramod\AppData\Roaming\Code\User\workspaceStorage\68adb333e7c4b36a52ea53bc8c24e1ec\redhat.java\jdt_ws\MPS_776f50d0\bin' 'Fabonacci'

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

PS C:\Users\Pramod\Desktop\MPS>```

## Java Program to Display Fibonacci Series using for loop

```Public class JavaExample {

public static void main (String [] args) {

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

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

/ * At each iteration, we are assigning another number
* To specify the sum of the first number and the last two
* Number on the second number
* /
int sumOfPrevTwo = num1 + num2;
num1 = num2;
num2 = sumOfPrevTwo;
}
}
}```

### Output:

```PS C:\Users\Pramod\Desktop\MPS>  c:; cd 'c:\Users\Pramod\Desktop\MPS'; & 'c:\Users\Pramod\.vscode\extensions\vscjava.vscode-java-debug-0.31.0\scripts\launcher.bat' 'C:\Program Files\Java\jdk-15.0.2\bin\java.exe' '--enable-preview' '-XX:+ShowCodeDetailsInExceptionMessages' '-Dfile.encoding=UTF-8' '-cp' 'C:\Users\Pramod\AppData\Roaming\Code\User\workspaceStorage\68adb333e7c4b36a52ea53bc8c24e1ec\redhat.java\jdt_ws\MPS_776f50d0\bin' 'Fabonacci'

fibonacci series of 7 number: 0 1 1 2 3 5 8

PS C:\Users\Pramod\Desktop\MPS>```

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