如何将值存储在 calc 中并继续计数？

Question

如何修改代码让我可以连续计数？所以例如2+3=5，比-1=4，直到我按q退出程序？？请为初学者提供一些简单的解决方案。谢谢。

import java.util.Objects;
import java.util.Scanner;

public class Calc {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            System.out.println("Enter first number:");
            double num1 = sc.nextDouble();
            System.out.println("Enter second number");
            double num2 = sc.nextDouble();

            System.out.println("Select operator (+,-,*,/) or enter q to exit:");
            char operator = sc.next().charAt(0);
            switch (operator) {
                case '+':
                    System.out.println("Result =" + Equasion.sum(num1, num2));
                    break;

                case '-':
                    System.out.println(Equasion.substract(num1, num2));
                    break;

                case'/':
                    if (num2 == 0) {
                        System.out.println("Divide by zero problem");
                    } else System.out.println(Equasion.divide(num1, num2));

                case '*':
                    System.out.println(Equasion.multiply(num1, num2));
                    break;

                case 'q':
                    System.exit(0);

            }
            System.out.println("Press any key to continue or q to quit");
        } while (!Objects.equals(ExitProg.exitProg(), 'q'));
    }
}

Answer 1

如果我错了，请纠正我，但您应该将第一行移出 while 循环，然后在每次迭代时覆盖 num1 和 num2 的值（num2 变为 num1，然后用户输入另一个 num2）