package javaapplication9;
import java.util.Random;

/*
UsingArrays.java example code
AC Chapin
 */


public class UsingArrays {

    // given an array of ints, print it out, one per line
    public static void printList(int[] list) {
        System.out.println("---LIST---");
        for (int i = 0; i < list.length; i++) {
            System.out.println(list[i]);
        }
        System.out.println("----------");
    }

    // given a length and a value
    // return an array of that length
    // where all the elements have that value
    public static int[] makeList(int len, int val) {
        // won't make an array of size less than 1
        if (len < 1) {
               return null;
        }
        // set up the array with the right length
        int[] list = new int[len];
        // fill it with the given value
        for (int i = 0; i < list.length; i++) {
            list[i] = val;
        }
        return list;
    }


    public static void main(String[] args) {
       // set up a random number generator
        Random randgen = new Random();

        // seed randgen so we get same numbers every time
        // commented out to try more random numbers
        //randgen.set(5555);

       int[] list1 = new int[10];

       // fill the array with random ints from -10 to 10 (inclusive
       for (int i = 0; i < list1.length; i++ ) {
           list1[i] = randgen.nextInt(21) - 10;
                // (21) gives a number from 0 to 20
                // add or subtract to set the minimum number
                //      -10 gives a number from -10 to 10
       }

       // using an individual element
       list1[0] = 100;
       // passing the whole array -- no square braces
       printList(list1);


       // use makeList to set up an array of length 10 that's all 5's
       int [] list2 = makeList(10,5);
       // then print it
       printList(list2);

       // makeList returns an array of length 5 that's all 55's
       // and printlist prints it
       printList(makeList(5, 55));

       double[] dlist = new double[10];

       // fill the array with random doubles from 50 to 150
       for (int i = 0; i < dlist.length; i++ ) {
           dlist[i] = randgen.nextDouble() * 100 +50;
                // nextDouble gives a number from 0.0 to 1.0
                // multiply to set the range:
                //      * 100 gives a number from 0.0 to 100.0
                // add or subtract to set the minimum number
                //      +50 gives a number from 50 to 150.0
       }

    }
}