### Fibonacci Series Java Program Using for Loop

In this Java program, I show you how to calculate the Fibonacci series of a given number in Java (using for loop).
Fibonacci series is a sequence of values such that each number is the sum of the two preceding ones, starting from 0 and 1. The beginning of the sequence is thus:
``0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 ...``

# Fibonacci Series Java Program Using for Loop

In this program, we are using a simple for loop to demonstrate how to calculate the Fibonacci series in Java.
```package net.javaguides.corejava.programs;

import java.util.Scanner;

/**
* This program calculates the fibonacci sequence of given number.
*
*
*/
public class FibonacciProgramUsingLoop {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

System.out.print("Enter a number: ");

int maxNumber = scanner.nextInt();

int previousNumber = 0;
int nextNumber = 1;

System.out.print("Fibonacci Series of " + maxNumber + " numbers:");

for (int i = 1; i <= maxNumber; ++i) {
System.out.print(previousNumber + " ");
int sum = previousNumber + nextNumber;
previousNumber = nextNumber;
nextNumber = sum;
}

scanner.close();
}
}```
Output:
``````Enter a number: 10

Fibonacci Series of 10 numbers:0 1 1 2 3 5 8 13 21 34``````

# Fibonacci Series Java Program Using for Loop and BigInteger

Since Fibonacci series is a sequence of infinite numbers, we use BigInteger type for calculations:
```package net.javaguides.corejava.programs;

import java.math.BigInteger;
import java.util.Scanner;

/**
* This program calculates the fibonacci sequence of given number.
*
*/
public class FibonacciProgramUsingLoop {

public static BigInteger fibonacci(int n) {

if (n <= 1) return BigInteger.valueOf(n);

BigInteger previous = BigInteger.ZERO, next = BigInteger.ONE, sum;

for (int i = 2; i <= n; i++) {

sum = previous;
previous = next;
}

return next;
}

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

System.out.print("Enter a number: ");

int n = scanner.nextInt();

for (int i = 0; i < n; i++) {

BigInteger val = fibonacci(i);
System.out.print(val + "\t");
}

scanner.close();
}
}```
Output:
``````Enter a number: 10

0 1 1 2 3 5 8 13 21 34``````

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