/*
 * ArrayExample.java
 * example of using primitive array to store grades
 */
package cis119.pkg15arrays;

public class ArrayExample {

	// dealing with lists of values the stupid way
    public static void howNotToDoIt() {
        // how not to do it
        int grade0 = 67;
        int grade1 = 71;
        int grade2 = 99;
        int grade3 = 83;
        int grade4 = 77;
        int grade5 = 88;
        int grade6 = 62;
        int grade7 = 79;
        int grade8 = 91;
        int grade9 = 86;
        
        double average = 0;
        average += grade0;
        average += grade1;
        average += grade2;
        average += grade3;
        average += grade4;
        average += grade5;
        average += grade6;
        average += grade7;
        average += grade8;
        average += grade9;

        average = average / 10;
        
        System.out.println("Grades:");
        System.out.println("\thwk 1: " + grade0);
        System.out.println("\thwk 2: " + grade1);
        System.out.println("\thwk 3: " + grade2);
        System.out.println("\thwk 4: " + grade3);
        System.out.println("\thwk 5: " + grade4);
        System.out.println("\thwk 6: " + grade5);
        System.out.println("\thwk 7: " + grade6);
        System.out.println("\thwk 8: " + grade7);
        System.out.println("\thwk 9: " + grade8);
        System.out.println("\thwk 10: " + grade9);
        System.out.println("average: " + average);
        
        // lost the will to code...
    }

	// dealing with lists of values with arrays
    public static void withArrays() {
        // grades is an array of ints (not just one)
        int [] grades;
        	// at this point, grades is null
        	
        // grades will contain 10 ints
        // this means grade.length is 10
        // and grades goes from grades[0] to grades[9]
        // grades holds the address of an array of ints
        grades = new int[10];
        
        // individual values, so we still have to do this
        // manually, one by one.
        grades[0] = 67;
        grades[1] = 71;
        grades[2] = 99;
        grades[3] = 83;
        grades[4] = 77;
        grades[5] = 88;
        grades[6] = 62;
        grades[7] = 79;
        grades[8] = 91;
        grades[9] = 86;

        // but we do have a shortcut
        grades = new int[]{67, 71, 99, 83, 77, 88, 62, 79, 91, 86};
        
        double average = 0;
        // using a loop to add up all the elements of the array
        for (int i = 0; i < grades.length; i++){
            // first time through the loop grades[i] is grades[0]
            // then grades[1] then grades[2] etc up to grades[9]
            average += grades[i];
        }
        
        average = average / grades.length;

        
        // using a loop to print all the elements of the array
        System.out.println("Grades:");
        for (int i = 0; i < grades.length; i++){
            System.out.println("\thwk "+ (i + 1) + ": " + grades[i]);
        }

        System.out.println("average: " + average);        
    }
    
    
    
    // call the methods, demo more arrays
    public static void main(String[] args) {
        howNotToDoIt();
        withArrays();
        
        // other arrays
        double [] dlist = new double[5];
        String [] words = new String[10];
        boolean [] yesNo = new boolean[4];
        
        // doubles in arrays act like any other double
        dlist[0] = 2.2/3.0;
        dlist[1] = dlist[0] * 2;
        dlist[2] = dlist[0] + dlist[1];
        //dlist = 18.5; // NO, dlist is an ARRAY, not a double
        
        // Strings in arrays act like any other String
        words[5] = "hello";
        words[3] = "wor" + "ld";
        words[0] = words[5] + " " + words[3];
        //words = "quick brown fox"; // NO, words is an ARRAY, not a String
        
        // booleans in arrays act like any other boolean
        yesNo[0] = true;
        yesNo[1] = 5 < 19;
        yesNo[3] = yesNo[0] && yesNo[1];
        //yesNo = false; // NO, yesNo is an ARRAY, not a boolean
        
        // parallel arrays of carrots and names that some bunnies have
        int[] carrots = new int[10];
        // special initialization for names
        String[] names = new String[] {"Mopsy", "Flopsy", "Cottontail", "Peter", "Bugs",
            "Inky", "Blinky", "Stinky", "Winky", "Clyde"};
            // could just do = {"Mopsy", .. etc
            // but this works more often
        // zeroth bunny should have 10 carrots, 1th should hav 13, 2nd 16, 3rd 19 etc
        int val = 10; // starting value for carrots
        // assign all bunnies carrots
        for (int i = 0; i < carrots.length; i++) {
            carrots[i] = val + 3 * i; // original value plus the right number of 3s
        }
        // print info about the bunnies
        for (int i = 0; i < names.length; i++) {
            // humans number from 1, so adjust the number i to i+1
            System.out.println((i + 1) + ". " + names[i] + " has " + carrots[i] + " carrots");

        }

    }
}