java - 我希望计算器重新启动，直到我按下 'q' 字母

Question

我写了一个简单的计算器，我希望计算器重新启动，直到我按下“q”按钮。问题是我无法让它做到这一点。

我尝试了一些 do/while 循环，但我不断收到错误。

import java.util.Scanner;

public class Assignment2_3 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while(true) {
            System.out.println("Welcome to my mini calculator program!");
            System.out.println("Please enter the numbers along operation (press q to exit):");
            int number1 = in.nextInt();
            char typeoftheoperation = in.next().charAt(0);
            int number2 = in.nextInt();
            String terminate = "";
            double result;
            switch (typeoftheoperation) {
                case ('+'):
                    result = number1 + number2;
                    System.out.println("The result is :" + result);
                    break;

                case '-':
                    result = number1 - number2;
                    System.out.println("The result is :" + result);
                    break;

                case '*':
                    result = number1 * number2;
                    System.out.println("The result is :" + result);
                    break;

                case '/':
                    result = number1 / number2;
                    System.out.println("The result is :" + result);
                    break;
                terminate = in.next();
            if (terminate.equals("q"))
                in.close();
            }



        }
    }
}

我希望计算器继续运行，直到我决定输入“q”，然后它应该停止。

Answer 1

这是针对您所问问题的临时解决方案。您可能还想使用 try...catch... 来解决“inputmismatchException”。但这暂时有效。

    import java.util.Scanner;

    public class Assignment2_3 {
        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            while(true) {
                System.out.println("Welcome to my mini calculator program!");
                System.out.println("Please enter the numbers along operation (press q to exit):");
                int number1 = in.nextInt();
                char typeoftheoperation = in.next().charAt(0);
                int number2 = in.nextInt();
                String terminate = "";
                double result;
                switch (typeoftheoperation) {
                    case ('+'):
                        result = number1 + number2;
                        System.out.println("The result is :" + result);
                        break;

                    case '-':
                        result = number1 - number2;
                        System.out.println("The result is :" + result);
                        break;

                    case '*':
                        result = number1 * number2;
                        System.out.println("The result is :" + result);
                        break;

                    case '/':
                        result = number1 / number2;
                        System.out.println("The result is :" + result);
                        break;
                }
                terminate = in.next();
                if (terminate.equals("q")) {
                    in.close();
                    System.out.println("You turned off the calculator! See you again");
                    break;
                }



            }
        }
    }