add brain-calc.js and fix minor problens

Author: elrbkn

Makefile

@@ -8,6 +8,9 @@ brain-games:
 	node bin/brain-games.js
 brain-even:
 	node bin/brain-even.js
+brain-calc:
+	node bin/brain-calc.js
+
 
 lint:
 	npx eslint .

bin/brain-calc.js

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+import { playGameCalc } from '../games/brain-calc.js';
+
+// Запускаем игру
+playGameCalc();

games/brain-calc.js

@@ -0,0 +1,32 @@
+import readlineSync from 'readline-sync';
+import { greeting, getRandomNumber, getRandomOperator, getResult, handleAnswer } from '../index.js';
+//brain-calc
+export const playGameCalc = () => {
+    //Приветствуем
+    const userName = greeting();
+    // Поясняем смысл
+    console.log('What is the result of the expression?');
+    // Цикл игры
+    let correctAnswersCount = 0;
+    while (correctAnswersCount < 3) {
+        //Получаем пример
+        const randomNumber1 = getRandomNumber(); 
+        const randomNumber2 = getRandomNumber();
+        const randomOperator = getRandomOperator();
+        const example = `${randomNumber1} ${randomOperator} ${randomNumber2}`;
+        console.log(`Question: ${example}`);
+        // Получаем ответ пользователя
+        const userAnswer = readlineSync.question('Your answer: ');
+        //Вычисляем ответ
+        const correctAnswer = String(getResult(randomNumber1, randomOperator, randomNumber2));
+        // Сверяем результаты
+        const incorrectMessage = `'${userAnswer}' is wrong answer ;(. Correct answer was '${correctAnswer}'.\nLet's try again, ${userName}!`
+        const result = handleAnswer(userAnswer, correctAnswer, userName, correctAnswersCount, incorrectMessage);
+        correctAnswersCount = result.correctAnswersCount;
+        // Закрываем цикл
+        if (result.finished) {
+          break;
+        }
+    }
+  };
+

games/brain-even.js

@@ -2,11 +2,12 @@ import readlineSync from 'readline-sync';
 import { greeting, getRandomNumber, checkEvenness, handleAnswer } from '../index.js';
 // brain-even
 export const playGameEven = () => {
+    //Приветствуем
     const userName = greeting();
-    let correctAnswersCount = 0;
     // Поясняем смысл
     console.log('Answer "yes" if the number is even, otherwise answer "no".');
     // Цикл игры
+    let correctAnswersCount = 0;
     while (correctAnswersCount < 3) {
       // Получаем число
       const number = getRandomNumber();
@@ -16,11 +17,13 @@ export const playGameEven = () => {
       // Проверяем четность
       const correctAnswer = checkEvenness(number);
       // Сверяем результаты
-      const result = handleAnswer(userAnswer, correctAnswer, userName, correctAnswersCount);
+      const incorrectMessage = `Answer "${userAnswer}" if the number is even, otherwise answer "${correctAnswer}".\nLet's try again, ${userName}!`
+      const result = handleAnswer(userAnswer, correctAnswer, userName, correctAnswersCount, incorrectMessage);
       correctAnswersCount = result.correctAnswersCount;
       // Закрываем цикл
       if (result.finished) {
         break;
       }
     }
-  };
+  };
+

index.js

@@ -20,7 +20,7 @@ export const checkEvenness = (number) => {
 };
 
 // Функция подсчета ответов
-export const handleAnswer = (userAnswer, correctAnswer, userName, correctAnswersCount) => {
+export const handleAnswer = (userAnswer, correctAnswer, userName, correctAnswersCount, incorrectMessage) => {
   // Сравниваем ответы
   if (userAnswer === correctAnswer) {
     console.log('Correct!');
@@ -32,11 +32,33 @@ export const handleAnswer = (userAnswer, correctAnswer, userName, correctAnswers
       return { correctAnswersCount, finished: true };
     }
   } else {
-    console.log(`Answer "${userAnswer}" if the number is even, otherwise answer "${correctAnswer}".\nLet's try again, ${userName}!`);
+    console.log(incorrectMessage);
     // Завершение игры при неправильном ответе
     return { correctAnswersCount, finished: true };
   }
   // Игра продолжается
   return { correctAnswersCount, finished: false };
 };
 
+
+// Функция для генерации случайного математического оператора
+export const getRandomOperator = () => {
+  const operators = ['+', '-', '*'];
+  const randomIndex = Math.floor(Math.random() * operators.length);
+  const randomOperator = operators[randomIndex];
+  return randomOperator;
+};
+
+// Функция вычисления результата
+export const getResult = (num1, operator, num2) => {
+    switch (operator) {
+      case '+':
+        return num1 + num2;
+      case '-':
+        return num1 - num2;
+      case '*':
+        return num1 * num2;
+    }
+};
+
+