狂神说java简易计算机作业

package cn.ljy.method;

import java.util.Scanner;
/*
写一个计算器，要求实现加减乘除功能，并且能够循环接受新的数据，通过用户交互实现
思路推荐
写四个方法：加减乘除
利用循环+switch进行用户交互
传递需要操作的两个数
输出结果
 */
public class computer {
    public static void main(String[] args) {

        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入第一个数");
        while(scanner.hasNextInt()) {
            double n1 = scanner.nextDouble();
            System.out.println("一个符号");
            String flag = scanner.next();//scanner.next()只会吸取字符不会吸取空格之类的，遇到空格回车结束而nexiLine()会吸取字符前的空格/tab
            scanner.nextLine();
            System.out.println("请输入第二个数");
            double n2 = scanner.nextDouble();


            switch (flag) {
                case "+":
                    System.out.println(add(n1, n2));
                    break;
                case "-":
                    System.out.println(minus(n1, n2));
                    break;
                case "*":
                    System.out.println(multiply(n1, n2));
                    break;
                case "/":
                    if (n2==0)
                        System.out.println("除数不能为0");
                    else
                    System.out.println(except(n1, n2));
                    break;
                default:
                    System.out.println("运算符输入有误");
                    break;
            }
            System.out.println("输入非数字结束计算，输入数字继续进行计算");
        }
        System.out.println("感谢使用");
        scanner.close();



    }
    public static double add(double n1,double n2){
        double result=n1+n2;
        return  result;

    }
    public static double minus(double n1,double n2){
        double result=n1-n2;
        return result;

    }
    public static double except(double n1,double n2){

            double result = n1 / n2;
            return result;


    }
    public static double multiply(double n1,double n2){
        double result=n1*n2;
        return result;
    }
}