What is Fibonacci Series?
In Fibonacci series, next number is the sum of previous two numbers. The first two numbers of Fibonacci series are 0 and 1.
The Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21, ...
Using For Loop
//Using For Loop
public class FibonacciExample {
public static void main(String[] args)
{
// Set it to the number of elements you want in the Fibonacci Series
int maxNumber = 10;
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+" ");
/* 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 sum = previousNumber + nextNumber;
previousNumber = nextNumber;
nextNumber = sum;
}
}
} Program Logic: - previousNumber is initialized to 0 and nextNumber is initialized to 1
- For Loop iterates through
maxNumber - displays the previousNumber
- calculates sum of previousNumber and nextNumber
- updates new values of previousNumber and nextNumber
Using While Loop
You can also generate Fibonacci Series using a While loop in Java.
//Using While Loop
public class FibonacciWhileExample {
public static void main(String[] args)
{
int maxNumber = 10, previousNumber = 0, nextNumber = 1;
System.out.print("Fibonacci Series of "+maxNumber+" numbers:");
int i=1;
while(i <= maxNumber)
{
System.out.print(previousNumber+" ");
int sum = previousNumber + nextNumber;
previousNumber = nextNumber;
nextNumber = sum;
i++;
}
}
}The only difference in the program logic is use of WHILE Loop
Fibonacci Series Based On The User Input
//fibonacci series based on the user input
import java.util.Scanner;
public class FibonacciExample {
public static void main(String[] args)
{
int maxNumber = 0;
int previousNumber = 0;
int nextNumber = 1;
System.out.println("How many numbers you want in Fibonacci:");
Scanner scanner = new Scanner(System.in);
maxNumber = scanner.nextInt();
System.out.print("Fibonacci Series of "+maxNumber+" numbers:");
for (int i = 1; i <= maxNumber; ++i)
{
System.out.print(previousNumber+" ");
/* 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 sum = previousNumber + nextNumber;
previousNumber = nextNumber;
nextNumber = sum;
}
}
}
Program Logic: The logic is same as earlier. Instead of hardcoding the number of elements to show in Fibonacci Series, user is asked for the same
