Quizzes -

This project was designed to pass objects between multiple classes.

Main has a switch-case to choose which of the quizzes you will be taking. Each quiz will have a different number of questions.
Case 1 -> Quiz1.java -> QA.java -> printFormat.java
Case 2 -> Quiz2.java -> QA.java -> printFormat.java

Quiz 1 and Quiz 2 have the questions and answers into a 2D array. ArrayTwoD[0][0] has number of questions.

QA.java is questions and answers loop

Main.java

package net.michael;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        while (true) {
            System.out.println("0: Exit");
            System.out.println("1: Quiz1");
            System.out.println("Five math problems");
            System.out.println();
            System.out.println("2: Quiz2");
            System.out.println("Ten Capitals of countries and US States");
            System.out.println();
            Scanner MyCaseObj = new Scanner(System.in);
            int MyCase = MyCaseObj.nextInt();
            System.out.println();

            switch (MyCase) {
                case 1:
                    //created a 2D array for the questions and answers
                    Quiz1 object1_1 = new Quiz1();
                    String[][] arr = object1_1.Quiz1();

                    // passed array arr to QA
                    QA object1_2 = new QA();

                    // return score from QA
                    int length = Integer.parseInt(arr[0][0]);
                    int sc = object1_2.QA(arr);

                    //print out the score with a format
                    printFormat.printFormat(length, sc);
                    break;

                case 2:
                    //created a 2D array for the questions and answers
                    Quiz2 object2_1 = new Quiz2();
                    String[][] arr2 = object2_1.Quiz2();

                    // passed array arr to QA
                    int length2 = Integer.parseInt(arr2[0][0]);
                    QA object2_2 = new QA();

                    // return score from QA
                    int sc2 = object2_2.QA(arr2);

                    //print out the score with a format
                    printFormat.printFormat(length2, sc2);
                    break;

                case 0:
                    Scanner MyExit = new Scanner(System.in);
                    System.out.println("Exiting...");
                    MyExit.close();
                    return; // Exit the loop and program

                default:
                    System.out.println("default");

            }
        }
    }
}

Quiz1.java

package net.michael;

public class Quiz1 {
    public String[][] Quiz1() {
        String Str_rows = "6";
        String Str_columns = "2";
        int rows = Integer.parseInt(Str_rows);
        int columns = Integer.parseInt(Str_columns);
        String[][] ArrayTwoD = new String[rows][columns];
        ArrayTwoD[0][0] = Str_rows;
        ArrayTwoD[0][1] = Str_columns;
        ArrayTwoD[1][0] = "What is 1 + 2 ?";
        ArrayTwoD[1][1] = "3";
        ArrayTwoD[2][0] = "What is 1 - 2 ?";
        ArrayTwoD[2][1] = "-1";
        ArrayTwoD[3][0] = "What is 1 * 2 ?";
        ArrayTwoD[3][1] = "2";
        ArrayTwoD[4][0] = "What is 1 / 2 ?";
        ArrayTwoD[4][1] = "0.5";
        ArrayTwoD[5][0] = "What is 1 ^ 2 ?";
        ArrayTwoD[5][1] = "1";
        return ArrayTwoD;

    }
}

Quiz2.java

package net.michael;

public class Quiz2 {

    public String[][] Quiz2() {
        String Str_rows = "11";
        String Str_columns = "2";
        int rows = Integer.parseInt(Str_rows);
        int columns = Integer.parseInt(Str_columns);
        String[][] ArrayTwoD = new String[rows][columns];
        ArrayTwoD[0][0] = Str_rows;
        ArrayTwoD[0][1] = Str_columns;
        ArrayTwoD[1][0] = "What is capital of Italy ?";
        ArrayTwoD[1][1] = "Rome";
        ArrayTwoD[2][0] = "What is capital of the Estonia ?";
        ArrayTwoD[2][1] = "Tallinn";
        ArrayTwoD[3][0] = "What is the capital of France ?";
        ArrayTwoD[3][1] = "Paris";
        ArrayTwoD[4][0] = "What is the capital of England ?";
        ArrayTwoD[4][1] = "London";
        ArrayTwoD[5][0] = "What is the capital of Germany ?";
        ArrayTwoD[5][1] = "Berlin";
        ArrayTwoD[6][0] = "What is the capital of Poland ?";
        ArrayTwoD[6][1] = "Warsaw";
        ArrayTwoD[7][0] = "What is the capital of Ohio ?";
        ArrayTwoD[7][1] = "Columbus";
        ArrayTwoD[8][0] = "What is the capital of Michigan ?";
        ArrayTwoD[8][1] = "Lansing";
        ArrayTwoD[9][0] = "What is the capital of New York ?";
        ArrayTwoD[9][1] = "Albany";
        ArrayTwoD[10][0] = "What is the capital of Kentucky";
        ArrayTwoD[10][1] = "Frankfurt";
        return ArrayTwoD;

    }
}

QA.Java

package net.michael;

import java.util.Scanner;

public class QA {

    public int QA(String[][] ArrayTwoD) {
        int score = 0;

        String input_A = " ";
        Scanner scanner = new Scanner(System.in);
        System.out.println("Q = Quit");
        int x = 1;

        while (true) {
            System.out.println(ArrayTwoD[x][0]);
            input_A = scanner.next();
            if (input_A.equals("Q")) {
                break;
            }

            score = input_A.equals(ArrayTwoD[x][1]) ? score + 1 : score;
            x++;
            //converts string to int for quiz length
            int value = Integer.parseInt(ArrayTwoD[0][0]);
            if ( x > Integer.parseInt(ArrayTwoD[0][0])-1 ) {
                break;
            }
        }
        return score;

        }

    }

printFormat.Java

package net.michael;

import java.text.DecimalFormat;

public class printFormat {

    public static void printFormat(int Length, int score){

        float percent = (float) (score) / ( Length-1 ) * 100;
        DecimalFormat df = new DecimalFormat("#");
        String str_pct = df.format(percent);

        String myStr = "Your score is %d out of %s or %s%%";
        String result = String.format(myStr, score, Length-1, str_pct);
        System.out.println(result);


    }


}