Question

Create a program “Fib.java” and a method called “double[] getFib)” that creates an array with a length of 15 that contains the first 15 numbers in the Fibonacci sequence and returns it. Set the first element to 0 and the second element to 1, then use a for loop to fill out the rest of the array.

Answer 1

// formula for fibonacci Fn = F(n-1) + F(n-2) n>=2 F[0]=0.0 F[1]=1.0
class Fib{
   //function for calculating 15 fibonacci numbers
   public double[] getFib(){
       int num1=0,num2=1,num3,i,size=15;
       double[] fibArray = new double[15];   //double type array for stroing fibonacci values
       fibArray[0]=num1;   //first fibonacci number
       fibArray[1]=num2;   //second fibonacci number
       //loop for calculating third fibonacci number to 15th fibonacci numbers
       for(i=2;i<size;i++){
           num3=num1+num2;   //next fibonacci number calculated by sum of previous two fibonacci values
           fibArray[i]=num3;   //storing next fibonacci value in to array
           num1=num2;
           num2=num3;
       }
       return fibArray;   //returning array
   }
   public static void main(String args[]){
       Fib obj =new Fib();   //object creation
       double[] res = obj.getFib();   //stroing function return array
       //displaying first 15 fibonacci numbers
       for(int i=0;i<15;i++){
           System.out.println((i+1)+" fibnocci number fib["+i+"] = "+res[i]);
       }
   }
}