C++設計建議

Question

我做了一個Java的程序，它基本上是一個數學測驗，它根據用戶輸入隨機生成簡單的數學問題。現在，我在教導自己C++，我只是想知道，基於效率和組織，轉換此程序的最佳方式是什麼。例如，我的方法應該是類，如果他們留在一個類，等等。任何幫助，將不勝感激！這是我目前Java代碼

public class MathQuiz { 
Scanner s = new Scanner(System.in); 

int numberOne; 
int numberTwo; 
int actualSolution; 
int userSolution; 
int numberOfQuestions; 
int counter = 1; 
int temp; 
int randomOperation; 
int totalCorrect; 
int totalIncorrect; 
long startTime; 
long endTime; 
long totalTime; 
double percent; 
String operation; 
String done; 

public void mathQuizzer(){ 
    System.out.println("Welcome to Math Quiz!"); 
    System.out.println("What kind of questions would you like to answer?"); 
    System.out.println("Enter + for Addition"); 
    System.out.println("Enter - for Subtraction"); 
    System.out.println("Enter * for Multiplication"); 
    System.out.println("Enter/for Division"); 
    System.out.println("Enter m for Mix"); 
    operation = s.next(); 
    System.out.println("How many questions would you like to answer? "); 
    numberOfQuestions = s.nextInt(); 
    System.out.println(); 
    startTime = System.currentTimeMillis(); 
    while(counter <= numberOfQuestions){ 

     if(operation.equals("+")){ 
      System.out.println("Question " + counter + ":"); 
      createAdditionEquation(); 
      checkSolution(); 
      counter++; 
     } 
     else if(operation.equals("-")){ 
      System.out.println("Question " + counter + ":"); 
      createSubtractionEquation(); 
      checkSolution(); 
      counter++; 
     } 
     else if(operation.equals("*")){ 
      System.out.println("Question " + counter + ":"); 
      createMultiplicationEquation(); 
      checkSolution(); 
      counter++; 
     } 
     else if(operation.equals("/")){ 
      System.out.println("Question " + counter + ":"); 
      createDivisionEquation(); 
      checkSolution(); 
      counter++; 
     } 
     else if (operation.equals("m")){ 
      System.out.println("Question " + counter + ":"); 
      createMixEquation(); 
      checkSolution(); 
      counter++; 
     } 
     else{ 
      System.out.println("Sorry invalid operation"); 
      System.exit(0); 
     } 
    } 
    endTime = System.currentTimeMillis(); 
    report(); 
} 

public void createAdditionEquation(){ 
    numberOne = (int)(Math.random() * (100 + 1)); 
    numberTwo = (int)(Math.random() * (100 + 1)); 
    actualSolution = numberOne + numberTwo; 

    System.out.println(numberOne + " + " + numberTwo + "= ?"); 
} 

public void createSubtractionEquation(){ 
    numberOne = (int)(Math.random() * (100 + 1)); 
    numberTwo = (int)(Math.random() * (100 + 1)); 
    if(numberOne >= numberTwo){ 
     actualSolution = numberOne - numberTwo; 
    } 
    else{ 
     numberOne = temp; 
     numberOne = numberTwo; 
     numberTwo = temp; 
     actualSolution = numberOne - numberTwo; 
    } 

    System.out.println(numberOne + " - " + numberTwo + "= ?"); 
} 

public void createMultiplicationEquation(){ 
    numberOne = (int)(Math.random() * (10 + 1)); 
    numberTwo = (int)(Math.random() * ((20 - 1) + 1)); 
    actualSolution = numberOne * numberTwo; 

    System.out.println(numberOne + " * " + numberTwo + "= ?"); 
} 

public void createDivisionEquation(){ 
    numberOne = (int)(Math.random() * (100 + 1)); 
    numberTwo = (int)(1 +(Math.random() * (10 - 1))); 

    if((numberOne >= numberTwo) && (numberOne%numberTwo == 0)){ 
     System.out.println(numberOne + "/" + numberTwo + "= ?"); 
     actualSolution = numberOne/numberTwo; 
    } 
    else{ 
     createDivisionEquation(); 
    } 
} 

public void createMixEquation(){ 
    randomOperation = (int)(Math.random() * (5 - 1)); 
    System.out.println("Random Operation: " + randomOperation); 
    if(randomOperation == 0){ 
     createAdditionEquation(); 
    } 
    else if(randomOperation == 1){ 
     createSubtractionEquation(); 
    } 
    else if(randomOperation == 2){ 
     createMultiplicationEquation(); 
    } 
    else 
     createDivisionEquation(); 
} 

public void checkSolution(){ 

    System.out.println("Answer = "); 
    userSolution = s.nextInt(); 
    System.out.println(); 
    if(userSolution == actualSolution){ 
     System.out.println("Correct!"); 
     System.out.println("#########################"); 
     System.out.println(); 
     totalCorrect++; 
    } 
    else if(userSolution != actualSolution){ 
     System.out.println("Sorry, wrong answer. The correct solution is: " + actualSolution); 
     System.out.println("#########################"); 
     System.out.println(); 
     totalIncorrect++; 
    } 

} 

public void report(){ 
    percent = ((double) totalCorrect/numberOfQuestions) * 100; 
    totalTime = (endTime - startTime)/1000; 
    System.out.println("Report:"); 
    System.out.println("Questions Answered: " + numberOfQuestions); 
    System.out.println("Total Correct: " + totalCorrect); 
    System.out.println("Total Incorrect: " + totalIncorrect); 
    System.out.println("Percent: " + percent + "%"); 
    System.out.println("Time taken: " + totalTime + " seconds"); 
} 

} 

應當指出的是，我知道這個程序沒有優化，我沒事與暫時

Answer 1

這是關於程序設計。不考慮你目前的計劃的優點（查看code review），一個好的OO設計是一個好設計，壞設計是壞的，不管語言如何。

Answer 2

保持與Java的距離。它使用簡單的方法，可以1：1轉換爲C++。 要改變設計，可以在之後完成，特別是如果你對C++比較陌生。

沒有像Java泛型/ C++模板的技術變化。

Answer 3

要在我原來的評論擴大以及回答其他人張貼在這裏...

如果你想自學C++，你已經知道Java的，還有兩個是相當similiar。所以，根據你對Java的瞭解，自學C++。

你知道如何處理Java中的IO。查看一些文檔，並用C++開始練習IO，這有點不同。

你知道如何處理Java中的方法，並將其與C++進行比較（它們實際上是相同的）。但是另一方面，如果您想關注效率，組織或優化，您應該先用最熟悉的語言開始。就目前情況而言，或者至少在你說出你的問題的方式中，你似乎試圖在一個單一的界限中完成這兩個目標，當選擇一個或另一個來關注它時會更好。如果您只是複製&粘貼代碼並修復了Java和C++之間的語法差異，則代碼的C++版本將基本上與您的代碼的Java版本一樣精確，高效和優化。