add Gcd.java, mod App.java, Calc.java, Even.java

Author: alexeichuprikov

app/.idea/gradle.xml

@@ -2,6 +2,7 @@
 
 import hexlet.code.games.Calc;
 import hexlet.code.games.Even;
+import hexlet.code.games.Gcd;
 
 import java.util.Scanner;
 
@@ -12,6 +13,7 @@ public static void main(String[] args) {
         System.out.println("1 - Greet");
         System.out.println("2 - Even");
         System.out.println("3 - Calc");
+        System.out.println("4 - GCD");
         System.out.println("0 - Exit");
         System.out.print("Your choice : ");
         String option = scanner.nextLine();
@@ -26,6 +28,9 @@ public static void main(String[] args) {
             case "3":
                 Calc.play();
                 break;
+            case "4":
+                Gcd.play();
+                break;
         }
         scanner.close();
     }

app/.idea/workspace.xml

@@ -36,7 +36,7 @@ public static void play() {
             if (answer == rightAnswer) {
                 System.out.println("Correct!");
             } else {
-                System.out.println("'" + answer + "' is wrong answer ;(. Correct answer was '" + rightAnswer + "'." );
+                System.out.println("'" + answer + "' is wrong answer ;(. Correct answer was '" + rightAnswer + "'.");
                 System.out.println("Let's try again, " + userName + "!");
                 return;
             }

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

@@ -23,7 +23,8 @@ public static void play() {
             if (answer.equals(rightAnswer)) {
                 System.out.println("Correct!");
             } else {
-                System.out.println("'" + answer + "'" + " is wrong answer ;(. Correct answer was " + "'" + rightAnswer + "'.\nLet's try again, " + userName);
+                System.out.println("'" + answer + "'" + " is wrong answer ;(. Correct answer was " + "'" + rightAnswer + "'.");
+                System.out.println("Let's try again, " + userName + "!");
                 return;
             }
         }

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

@@ -0,0 +1,41 @@
+package hexlet.code.games;
+
+import hexlet.code.Engine;
+
+import java.util.Scanner;
+
+public class Gcd {
+    public static void play() {
+        String userName = Engine.description();
+        System.out.println("Find the greatest common divisor of given numbers.");
+        Scanner scanner = new Scanner(System.in);
+
+        for (int i = 1; i <= Engine.rounds; i++) {
+            int firstValue = (int) (Math.random() * 100) + 1;
+            int secondValue = (int) (Math.random() * 100) + 1;
+            int rightAnswer = 0;
+
+            int tempFirstValue = firstValue;
+            int tempSecondValue = secondValue;
+
+            while (tempSecondValue != 0) {
+                rightAnswer = tempSecondValue;
+                tempSecondValue = tempFirstValue % tempSecondValue;
+                tempFirstValue = rightAnswer;
+            }
+
+            System.out.println("Question: " + firstValue + " " + secondValue);
+            System.out.print("Your answer: ");
+            int answer = scanner.nextInt();
+
+            if (answer == rightAnswer) {
+                System.out.println("Correct!");
+            } else {
+                System.out.println("'" + answer + "' is wrong answer ;(. Correct answer was '" + rightAnswer + "'");
+                System.out.println("Let's try again, " + userName + "!");
+                return;
+            }
+        }
+        System.out.println("Congratulations, " + userName + "!");
+    }
+}