1. Beginners Project

import java.util.Arrays;
import java.util.Random;

public class Beginner {

    // CLASS 1 - MAIN
    public static void main(String args[]){

        // 26 - Random
        System.out.println("**** Random (26) ****");
        System.out.println("Random dice");
        Random dice = new Random();
        int number;
        for(int i=0; i<10; i++){
            number = 1 + dice.nextInt(6);
            System.out.println(number);
        }
        System.out.println();

        // 27, 28, 29 - Arrays
        System.out.println("**** Arrays (27, 28) ****");
        int array[] = {32, 16, 8, 4, 2, 1};
        System.out.println("Index\tValue");
        for(int i=0; i<array.length; i++){
            System.out.println(i + "\t\t" + array[i]);
        }
        int sum = Arrays.stream(array).sum();
        System.out.println("SUM = " + sum);
        System.out.println();

        // 30 - Frequency table
        System.out.println("**** Frequency tables (30) ****");
        int ROLL = 1200;
        System.out.println("I will throw a dice " + ROLL + " times and count the number of incidences of each number");
        int freq[] = new int[7];
        int zaria;
        // The above array consists of 7 elements equal to 0 right now, but I want to update it
        // Every time, I throw '4' for example, I want to add +1 in index '4' of array
        for(int roll=1; roll<=ROLL; roll++){
            zaria = 1 + dice.nextInt(6);
            ++freq[zaria];
            // The above command increases by 1, the value of 'freq' in index 'zaria'
        }
        float average = ROLL / 6;
        System.out.println("Face\tTimes");
        for(int face=1; face< freq.length; face++){
            System.out.println(face + "\t\t" + freq[face] + "\t\t(" + (freq[face] - average) + ")");
        }
        System.out.println();

        // 31, 32 - Using methods
        System.out.println("**** Methods (31, 32) ****");
        int a[] = {1, 2, 3, 4, 5, 6};
        print(a);
        add_number(a, 100);
        print(a);
        System.out.println();

        // 33, 34 - Multidimensional arrays
        System.out.println("**** Multidimensional arrays (33, 34)");
        int multi[][] = {a, {11}, {21, 22},  {31, 32, 33}};
        print(multi);

        // 35 - Unknown number of arguments
        System.out.println("**** Unknown number of arguments in a method (35) ****");
        int e = 10;
        int b = 20;
        int c = 30;
        int d = 100;
        print_average(e, b);
        print_average(e, b, c);
        print_average(e, b, c, d);
        System.out.println();

        // 36 -



    } // END OF MAIN


    // FUNCTION 2 - PRINT ELEMENTS
    public static void print(int array[]){
        String str = "[";
        for(int i=0; i<array.length; i++) {
            if(i == array.length - 1){
                str += array[i];
            }
            else {
                str += array[i] + ", ";
            }
        }
        str += "]";
        System.out.println(str);
    } // END OF STATUS


    // FUNCTION 3 - ADD NUMBER
    public static void add_number(int array[], int n){
        // This CANNOT BE DONE WITH ENHANCE FOR-LOOP
        for(int element = 0; element<array.length; element++){
            array[element] += n;
        }
    } // END OF ADD NUMBER


    // FUNCTION 4 - DISPLAY MULTIS
    public static void print(int multi[][]){
        for(int row=0; row<multi.length; row++){
            for(int col=0; col<multi[row].length; col++){
                System.out.print(multi[row][col] + "\t");
            }
            System.out.println();
        }
    } // END OF ADD NUMBER


    // FUNCITON 5 - AVERAGE
    public static void print_average(int... numbers){
        // 'numbers' IS NOT A LIST, BUT ITS CLOSE TO THIS LOGIC
        // '...' means that we do not know the exact number of arguments
        int sum = 0;
        String str = "[";
        for(int n: numbers) {
            sum += n;
            str += n + ", ";
        }
        str += "]";
        float average = sum / numbers.length;
        System.out.println("Average of " + str + " is = " + average);
    } // END OF AVERAGE


}