fibonacci java

1// java program to display fibonacci series using for loop
2public class FibonacciSeriesForLoop
3{
4   public static void main(String[] args)
5   {
6      int f = 10, num1 = 0, num2 = 1;
7      System.out.print("First " + f + " fibonacci sequence: ");
8      for(int a = 1; a <= f; ++a)
9      {
10         System.out.print(num1 + " + ");
11         int total = num1 + num2;
12         num1 = num2;
13         num2 = total;
14      }
15   }
16}

1// WARNING: The function assumes that 'fib(0)=0' and 'fib(1)=1'
2// Returns the number of the fibonacci sequence at index 'n'
3public static int fib(int n) {
4	if (n < 2) // No difference if '<' or '<=', because 'fib(2)=2'.
5		return n;
6	return fib(n-1) + fib(n-2); // Uses the recursion method for solving
7}

1public class Fibonacci {
2
3    public static void main(String[] args) {
4
5        int n = 10, t1 = 0, t2 = 1;
6        System.out.print("First " + n + " terms: ");
7
8        for (int i = 1; i <= n; ++i)
9        {
10            System.out.print(t1 + " + ");
11
12            int sum = t1 + t2;
13            t1 = t2;
14            t2 = sum;
15        }
16    }
17}

1import info1.*;
2
3public class FibonacciDemo1{
4
5  public static void main(String[] args){
6
7    System.out.print("Geben Sie ein Zahl an: ");
8
9    int a = Console.in.readInt();
10
11    System.out.println("fib("+a+") = " + fibonacci(a));
12
13  }
14
15  private static int fibonacci(int a){
16
17    if (a==1||a==2) return 1;
18
19    else return fibonacci(a-1)+fibonacci(a-2);
20
21  }
22
23}
24
25

1// fibonacci series in java using while loop
2public class FibonacciSeriesWhileLoop
3{
4   public static void main(String[] args)
5   {
6      int a = 1, num = 15, num1 = 0, num2 = 1;
7      System.out.print("First " + num + " fibonacci sequence: ");
8      while(a <= num)
9      {
10         System.out.print(num1 + " , ");
11         int total = num1 + num2;
12         num1 = num2;
13         num2 = total;
14         a++;
15      }
16   }
17}

1// 1 2 3 5 8 13 21 34
2
3public class Fibonacci {
4
5    public static void main(String[] args) {
6
7        int n = 10, t1 = 0, t2 = 1;
8        System.out.print("First " + n + " terms: ");
9
10        for (int i = 1; i <= n; ++i)
11        {
12            System.out.print(t1 + " + ");
13
14            int sum = t1 + t2;
15            t1 = t2;
16            t2 = sum;
17        }
18    }
19}