Add Prime Number game

Author: prusov-code

Makefile

@@ -14,3 +14,5 @@ brain-gcd:
 	./bin/brain-gcd
 brain-progression:
 	./bin/brain-progression
+brain-prime:
+	./bin/brain-prime

bin/brain-prime

@@ -0,0 +1,7 @@
+#!/usr/bin/env php
+
+<?php
+
+require __DIR__."/../vendor/autoload.php";
+
+\BrainGames\PrimeGame\startPrimeGame();

composer.json

@@ -9,15 +9,17 @@
             "src/EvenGame.php",
             "src/CalcGame.php",
             "src/GcdGame.php",
-            "src/ProgressionGame.php"
+            "src/ProgressionGame.php",
+            "src/PrimeGame.php"
         ]
     },
     "bin": [
         "bin/brain-games",
         "bin/brain-even",
         "bin/brain-calc",
         "bin/brain-gcd",
-        "bin/brain-progression"
+        "bin/brain-progression",
+        "bin/brain-prime"
     ],
     "authors": [
         {

src/PrimeGame.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace BrainGames\PrimeGame;
+
+use function BrainGames\Cli\playGame;
+
+function startPrimeGame(): void
+{
+    $questions = [];
+    $answers = [];
+    for ($i = 0; $i < 3; $i++) {
+        $questions[$i] = rand(1, 100);
+        $answers[$i] = isPrime($questions[$i]) ? 'yes' : 'no';
+    }
+    playGame($questions, $answers, 'Answer "yes" if given number is prime. Otherwise answer "no".');
+}
+
+function isPrime(int $number): bool
+{
+    if ($number < 2) {
+        return false;
+    }
+    if ($number === 2) {
+        return true;
+    }
+    if ($number % 2 === 0) {
+        return false;
+    }
+    for ($i = 3; $i < sqrt($number); $i += 2) {
+        if ($number % $i === 0) {
+            return false;
+        }
+    }
+    return true;
+}