add Progression.java, mod README.md, App.java

Author: alexeichuprikov

README.md

@@ -7,6 +7,9 @@ https://asciinema.org/a/5NUp6quilr3DtKLHDEYSfAcZ2
 ### Demo 4 (GCD)
 https://asciinema.org/a/5TK9BqwuQriLXfKwwefoqJjLP
 
+### Demo 5 (Progression)
+https://asciinema.org/a/lB79E4WkEmp1207S7mYMDvjjQ
+
 
 ### Hexlet tests and linter status:
 [![Actions Status](https://github.com/alexeichuprikov/qa-auto-engineer-java-project-61/actions/workflows/hexlet-check.yml/badge.svg)](https://github.com/alexeichuprikov/qa-auto-engineer-java-project-61/actions)

app/.gitignore

@@ -6,17 +6,18 @@ build/
 INFO.md
 
 ### IntelliJ IDEA ###
+.idea/
+*.iws
+*.iml
+*.ipr
 .idea/modules.xml
 .idea/jarRepositories.xml
 .idea/compiler.xml
 .idea/libraries/
-*.iws
-*.iml
-*.ipr
 out/
 !**/src/main/**/out/
 !**/src/test/**/out/
-.idea/
+
 
 ### Eclipse ###
 .apt_generated

app/.idea/.gitignore

@@ -3,6 +3,7 @@
 import hexlet.code.games.Calc;
 import hexlet.code.games.Even;
 import hexlet.code.games.Gcd;
+import hexlet.code.games.Progression;
 
 import java.util.Scanner;
 
@@ -14,6 +15,7 @@ public static void main(String[] args) {
         System.out.println("2 - Even");
         System.out.println("3 - Calc");
         System.out.println("4 - GCD");
+        System.out.println("5 - Progression");
         System.out.println("0 - Exit");
         System.out.print("Your choice : ");
         String option = scanner.nextLine();
@@ -31,6 +33,9 @@ public static void main(String[] args) {
             case "4":
                 Gcd.play();
                 break;
+            case "5":
+                Progression.play();
+                break;
         }
         scanner.close();
     }

app/.idea/gradle.xml

@@ -0,0 +1,53 @@
+package hexlet.code.games;
+
+import hexlet.code.Engine;
+
+import java.util.Scanner;
+
+public class Progression {
+    public static void play() {
+        String userName = Engine.description();
+        System.out.println("What number is missing in the progression?");
+        Scanner scanner = new Scanner(System.in);
+
+
+        for (int i = 1; i <= Engine.rounds; i++) {
+            int start = (int) (Math.random() * 20) + 1;
+            int step = (int) (Math.random() * 10) + 1;
+            int length = 10;
+            int[] sequence = addSequence(start, step, length);
+
+            int hideIndex = (int) (Math.random() * length);
+            int hideValue = sequence[hideIndex];
+
+            System.out.print("Question: ");
+            for (int j = 0; j < length; j++) {
+                if (j == hideIndex) {
+                    System.out.print(".. ");
+                } else {
+                    System.out.print(sequence[j] + " ");
+                }
+            }
+            System.out.print("Your answer: ");
+            int answer = scanner.nextInt();
+
+            if (answer == hideValue) {
+                System.out.println("Correct!");
+            } else {
+                System.out.println("'" + answer + "' is wrong answer ;(. Correct answer was '" + hideValue + "'.");
+                System.out.println("Let's try again, " + userName + "!");
+                return;
+            }
+        }
+        System.out.println("Congratulations, " + userName + "!");
+    }
+
+    public static int[] addSequence(int start, int step, int length) {
+        int[] sequence = new int[length];
+
+        for (int i = 0; i < length; i++) {
+            sequence[i] = start + i * step;
+        }
+        return sequence;
+    }
+}