Write a Java program that generates an array of Fibonacci numbers. Specification

Question

Write a Java program that generates an array of Fibonacci numbers. Specifications: The program . Fills a one-dimensional array with the first 30 Fibonacci numbers using a calculation to generate the numbers. Note: The first two Fibonacci numbers 0 and 1 should be generated explicitly as in long[] series new long[limit] //create first 2 series elements series[O] 0; series[1]1; . But, it is not permissible to fill the array explicitly with the Fibonacci series' after the first two elements (0 and 1). From that point on the numbers must be calculated.

Explanation / Answer

import java.util.*;
class Fibonacci {

// Calculating the Fibonacci values
public static void calculate(long[] arr) {
    int a=0,b=1,c,i;
    for(i=2;i<30;i++) {
      c=a+b;
      a=b;
      b=c;
      arr[i] = c;
    }
}

public static void main(String[] args) {
    long[] series = new long[30];
    // Implicit declaration
    series[0] = 0;
    series[1] = 1;
    // Explicit calculation
    calculate(series);
    int i=0;
    // Displaying all the values in the array
    System.out.println("The first 30 numbers of Fibonacci:");
    for(;i<30;i++)
      System.out.print(series[i] + " ");
    int inp = 0;
    Scanner sc = new Scanner(System.in);
    // Input the user value and check whether it's in the range of 1-30
    do{
      System.out.print(" Which of the number in this series you want to see: ");
      inp = sc.nextInt();
      if(inp>0 && inp<31)
        break;
      else
        System.out.print("Must be in the range of 1 to 30");
    } while(true);
    // Array index starts at zero, thus input - 1 is calculated
    System.out.println("The " + inp + "th Fibonacci number is " + series[inp-1]);
}
}

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