add game Calc, add class Engine

Author: Prototype206

README.md

@@ -6,7 +6,15 @@
 ![Java CI](https://github.com/Prototype206/java-project-61/workflows/Quality%20Check/badge.svg)
 ![Java](https://img.shields.io/badge/Java-22-blue)
 
-![Greetings](screenshots/choice-1.png)
-![Even win](screenshots/choice-2-win.png)
-![Even lose](screenshots/choice-2-lose.png)
-![Exit](screenshots/choice-3-exit.png)
+### User's Greeting
+![Greetings](screenshots/Greetings.png)
+### Victory in the app Even 
+![Even win](screenshots/EvenGame-win.png)
+### Defeat in the app Even 
+![Even lose](screenshots/EvenGame-lose.png)
+### Victory in the app Calc 
+![Calc win](screenshots/CalcGame-win.png)
+### Defeat in the app Calc 
+![Calc lose](screenshots/CalcGame-lose.png)
+### Exiting the app   
+![Exit](screenshots/Exiting-app.png)

app/src/main/java/hexlet/code/App.java

@@ -1,12 +1,15 @@
 package hexlet.code;
 import java.util.Scanner;
 
+import hexlet.code.games.Calc;
+import hexlet.code.games.Even;
+
 public class App {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		try {
 		System.out.println("Please enter the game number and press Enter.");
-		System.out.print("1 - Greet\n2 - Even\n0 - Exit\nYour choice: ");
+		System.out.print("1 - Greet\n2 - Even\n3 - Cacl\n0 - Exit\nYour choice: ");
 		int usersChoise = 0;
 
 		try {
@@ -22,7 +25,13 @@ public static void main(String[] args) {
 			break;
 		case 2:
 			Cli.greetings(scanner);
-			Even.startGameEven(scanner);
+			Even.startGameEven();
+			Engine.runGame(Engine.EVEN_GAME_NUMBER, scanner);
+			break;
+		case 3:
+			Cli.greetings(scanner);
+			Calc.startGameCalc();
+			Engine.runGame(Engine.CALC_GAME_NUMBER, scanner);
 			break;
 		case 0:
 			break;

app/src/main/java/hexlet/code/Engine.java

@@ -0,0 +1,44 @@
+package hexlet.code;
+
+import java.util.Scanner;
+
+import hexlet.code.games.Calc;
+import hexlet.code.games.Even;
+
+public class Engine {
+	private static int scoreCounter = 0;
+	private static int scoreToWin = 3;
+	private static StringBuilder correctAnswer = new StringBuilder();
+	private static StringBuilder usersAnswer = new StringBuilder();
+	static final int EVEN_GAME_NUMBER = 2;
+	static final int CALC_GAME_NUMBER = 3;
+	
+	public static void runGame(int gameNumber, Scanner scanner) {
+		for(int i = 0; i<scoreToWin; i++) {
+			correctAnswer.setLength(0);
+			usersAnswer.setLength(0);
+			switch(gameNumber) {
+			case EVEN_GAME_NUMBER:
+				correctAnswer.append(Even.generateCorrectAnswer());
+				break;
+			case CALC_GAME_NUMBER:
+				correctAnswer.append(Calc.generateCorrectAnswer());
+				break;
+			}
+			System.out.print("Your answer: ");
+			usersAnswer.append(scanner.nextLine());
+			if(usersAnswer.toString().equals(correctAnswer.toString())) {
+				System.out.println("Correct!");
+				scoreCounter++;
+			}
+			else{
+				System.out.println(usersAnswer + " is wrong answer ;(. Correct answer was " + correctAnswer.toString() + ".\nLet\'s try again, " + Cli.userName + "!");
+				break;
+			}
+			if(scoreCounter == scoreToWin) {
+				System.out.println("Congratulations, " + Cli.userName);
+			}
+		}
+	}
+
+}

app/src/main/java/hexlet/code/Even.java

@@ -0,0 +1,39 @@
+package hexlet.code.games;
+
+public class Calc {
+	private static int minValue = 0;
+	private static int maxValue = 2;
+	private static int operationNumber;
+	private static int correctAnswer = 0;
+	private static int numberOne;
+	private static int numberTwo;
+	
+	
+	public static void startGameCalc() {
+		System.out.println("What is the result of the expression?");
+	}
+		
+		public static String generateCorrectAnswer() {
+			numberOne = (int) (Math.random()*100);
+			numberTwo = (int) (Math.random()*100);
+			operationNumber = (int) (Math.random()*(maxValue-minValue+1)+minValue);
+			
+			System.out.print("Question: " + numberOne);
+			
+			switch(operationNumber) {
+				case(0):
+					System.out.println(" + " + numberTwo);
+					correctAnswer = numberOne + numberTwo;
+					break;
+				case(1):
+					System.out.println(" - " + numberTwo);
+					correctAnswer = numberOne - numberTwo;
+					break;
+				case(2):
+					System.out.println(" * " + numberTwo);
+					correctAnswer = numberOne * numberTwo;
+					break;
+			}
+			return String.valueOf(correctAnswer);
+		}
+}

app/src/main/java/hexlet/code/games/Calc.java

@@ -0,0 +1,28 @@
+package hexlet.code.games;
+
+public class Even {
+	private static int evenDivisor = 2;
+	private static int oddRemainder = 1;
+	private static StringBuilder correctAnswer = new StringBuilder();
+	
+	public static void startGameEven() {
+		System.out.println("Answer \'yes\' if the number is even, otherwise answer \'no\'.");
+	}
+		
+
+	public static String generateCorrectAnswer() {
+		correctAnswer.setLength(0);
+		int randomNumber = (int) (Math.random()*100);
+		if(randomNumber % evenDivisor == oddRemainder) {
+			correctAnswer.append("no");
+		}
+		else {
+			correctAnswer.append("yes");
+		}
+		
+		System.out.println("Question: " + randomNumber);
+		return correctAnswer.toString();
+	}
+		
+
+}