2022-07-13 day06 第一小组 王鸣赫

int [] a1 = {1,2,3,4,5,6};
int [] a2 = new int[5];//声明[]右边
int [] a3 = new int[]{};

package com.jsoft.afternoon;

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        loop:for (;;){
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输出第一个数");
        int firNum=scanner.nextInt();
        System.out.println("请输出第二个数");
        int secNum=scanner.nextInt();
        System.out.println("请输出符号");
        String str=scanner.next();
        switch (str){
            case "+":
                System.out.println("结果为"+(firNum+secNum));
                break;
            case "-":
                System.out.println("结果为" + (firNum - secNum));
                break;
            case "*":
                System.out.println("结果为" + (firNum * secNum));
                break;
            case "/":
                if (secNum==0){
                    System.out.println("除数不能为零请重新输入");
                    continue loop;
                }
                System.out.println("结果为" + (firNum / secNum));
                break;
            default:
                System.out.println("符号错误");
        }
        loop2:for (;;){
        System.out.println("是否继续？重新输入1，退出程序输入2");
        String flag=scanner.next();
        switch (flag){
            case "1":
                continue loop;
            case "2":
                System.out.println("已退出");
                break loop;
            default:
                System.out.println("输入无效请重新输入");
                continue loop2;
        }
        }
    }
    }
}