如何添加在 Java 中运行了多少次的摘要报告？

Question

我正在尝试获取用户在退出程序后在计算器中完成问题的次数的总报告。我希望它看起来像这样：

计算器报告
加法题：3
减法问题：0
乘法问题：2
划分问题：1
总问题：6

下面是我的代码。代码的计算器部分有效，我想我已经设置了正确的计数变量，但在用户退出时无法创建报告。

import java.util.Scanner;
import java.math.*;

public class Calculator2
 {
 private static final Scanner askScanner = new Scanner(System.in);
 public static int answer;
 public static int firstNumber;
 public static int secondNumber; //makes variables for the whole class

 //Used for the Report at the end. 
 public static int addCount = 0;
 public static int subCount = 0;
 public static int mulCount = 0;
 public static int divCount = 0;


 public static void main(String[] args) {
    calculator();
    printReport();
 }

 public static void calculator() {


  
  while (true) {
  
     System.out.println("Basic calculator");
     System.out.println("Pick one:");
     System.out.println("(A)ddition");
     System.out.println("(S)ubtraction");
     System.out.println("(M)ultiplication");
     System.out.println("(D)ivision");
     System.out.println("\n(E)xit");
  
     String line = askScanner.nextLine().toUpperCase(); //Allows for any input to be a capitol letter.
     char pick = line.charAt(0);
  
  //uses the input of the user and directs it to the correct opertation
     if(pick == 'A') {
        addition();
     }
     else if(pick == 'S') {
        subtraction();
     }
     else if(pick == 'M') {
        multiplication();
     }
     else if(pick == 'D') {
        division();
     }
     else if(pick == 'E') {
        exit();
     }
     else {
        System.out.println("You need to choose A, S, M, D, or E");
        
     
     }
  } // end while


 }
 //asks the user for the 2 numbers
  private static void getNumbers() {
    System.out.print("Enter you first number: ");
    firstNumber = askScanner.nextInt();
    System.out.print("Enter your second number: ");
    secondNumber = askScanner.nextInt();
    askScanner.nextLine();  
   }
 //the different operations based off what the user wanted to do plus the operation itself
  public static void subtraction() {
    System.out.println("Subtraction");
    getNumbers();
    answer = firstNumber - secondNumber;
    System.out.println("This is the difference of the two numbers:  " + answer);
    subCount++;  
 }

   public static void addition() {
    System.out.println("Addition");
    getNumbers();
    answer = firstNumber + secondNumber;
    System.out.println("This is the sum of the two numbers:  " + answer);
    addCount++; 
 }

 public static void multiplication() {
    System.out.println("Multiplication");
    getNumbers();
    answer = firstNumber * secondNumber;
    System.out.println("This is the product of the two numbers  " + answer);
    mulCount++;  
 }

 public static void division() {
    System.out.println("Division");
    getNumbers();
    try{
       answer = firstNumber / secondNumber; 
       System.out.println("This is the quotient of the two numbers:    " + answer);
    }
    catch (ArithmeticException e) {
       System.out.println("Cannot divide by zero!! Please enter another number to divide by." );
    }
    divCount++; 
   
 }

 public static void exit() {
    System.exit(0);   
   }


 public static void printReport() {
  }
 }

Answer 1

每次调用计算器函数时递增的变量非常好。 我会像这样填写 printReport() 方法

public static void printReport() {
    System.out.println("Calculator Report");
    System.out.println("Addition problems: " + addCount);
    System.out.println("Substraction problems: " + subCount);
    System.out.println("Multiplication problems: " + mulCount);
    System.out.println("Division problems: " + divCount);
    System.out.println("Total Problems: " + (addCount + subCount + mulCount + divCount));
}

并将退出方法更改为

public static void exit() {
    Calculator2.printReport();
    System.exit(0);
}

请务必在 exit() 方法中调用 printReport() 方法。并在 System.exit(0); 之前执行。线。否则不会执行。

如果需要，您可以复制此代码。我为你实现了这些方法：

import java.util.Scanner;
import java.math.*;

public class Calculator2
{
    private static final Scanner askScanner = new Scanner(System.in);
    public static int answer;
    public static int firstNumber;
    public static int secondNumber; //makes variables for the whole class

    //Used for the Report at the end.
    public static int addCount = 0;
    public static int subCount = 0;
    public static int mulCount = 0;
    public static int divCount = 0;


    public static void main(String[] args) {
        calculator();
        printReport();
    }

    public static void calculator() {
        while (true) {

            System.out.println("Basic calculator");
            System.out.println("Pick one:");
            System.out.println("(A)ddition");
            System.out.println("(S)ubtraction");
            System.out.println("(M)ultiplication");
            System.out.println("(D)ivision");
            System.out.println("\n(E)xit");

            String line = askScanner.nextLine().toUpperCase(); //Allows for any input to be a capitol letter.
            char pick = line.charAt(0);

            //uses the input of the user and directs it to the correct opertation
            if(pick == 'A') {
                addition();
            }
            else if(pick == 'S') {
                subtraction();
            }
            else if(pick == 'M') {
                multiplication();
            }
            else if(pick == 'D') {
                division();
            }
            else if(pick == 'E') {
                exit();
            }
            else {
                System.out.println("You need to choose A, S, M, D, or E");


            }
        } // end while


    }
    //asks the user for the 2 numbers
    private static void getNumbers() {
        System.out.print("Enter you first number: ");
        firstNumber = askScanner.nextInt();
        System.out.print("Enter your second number: ");
        secondNumber = askScanner.nextInt();
        askScanner.nextLine();
    }
    //the different operations based off what the user wanted to do plus the operation itself
    public static void subtraction() {
        System.out.println("Subtraction");
        getNumbers();
        answer = firstNumber - secondNumber;
        System.out.println("This is the difference of the two numbers:  " + answer);
        subCount++;
    }

    public static void addition() {
        System.out.println("Addition");
        getNumbers();
        answer = firstNumber + secondNumber;
        System.out.println("This is the sum of the two numbers:  " + answer);
        addCount++;
    }

    public static void multiplication() {
        System.out.println("Multiplication");
        getNumbers();
        answer = firstNumber * secondNumber;
        System.out.println("This is the product of the two numbers  " + answer);
        mulCount++;
    }

    public static void division() {
        System.out.println("Division");
        getNumbers();
        try{
            answer = firstNumber / secondNumber;
            System.out.println("This is the quotient of the two numbers:    " + answer);
        }
        catch (ArithmeticException e) {
            System.out.println("Cannot divide by zero!! Please enter another number to divide by." );
        }
        divCount++;

    }

    public static void exit() {
        Calculator2.printReport();
        System.exit(0);
    }


    public static void printReport() {
        System.out.println("Calculator Report");
        System.out.println("Addition problems: " + addCount);
        System.out.println("Substraction problems: " + subCount);
        System.out.println("Multiplication problems: " + mulCount);
        System.out.println("Division problems: " + divCount);
        System.out.println("Total Problems: " + (addCount + subCount + mulCount + divCount));
    }
}