Java第十次作业

1.

package mld1;

import java.util.Scanner;

public class M {

    public static void mp() {
        Scanner input = new Scanner(System.in);
        int a[] = new int[5];
        System.out.println("请输入5个数:");
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextInt();
        }
        for (int i = 0; i < a.length - 1; i++) {
            for (int j = 0; j < a.length - 1 - i; j++) {
                if (a[j] > a[j + 1]) {
                    int temp = a[j];
                    a[j] = a[j + 1];
                    a[j + 1] = temp;
                }
            }
        }
        System.out.println("排序后的顺序为:");
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
    }

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

 

 

 

2.

package mld;

public class MLD {

    public static int jc(int b) {
        int sum=1;
        for(int a=1;a<=b;a++){
            sum*=a;
        }
      return sum;
    }
     public static void main(String[] args){
         System.out.println(jc(5));
     }
           
}

 

 

 

3.

package mld1;

import java.util.Scanner;

public class M {

    public static void mld() {
        Scanner input=new Scanner(System.in);
        System.out.println("请输入年份");
        int year=input.nextInt();
        if(year % 4== 0 && year % 100 != 0 || year % 400 == 0 ){
            System.out.println("该年为闰年");
        }else{
            System.out.println("该年为平年");
        }
    }
    public static void main(String[] args){
        mld();
    }
           
}

 

 

4.

package mld1;

import java.util.Random;
import java.util.Scanner;

public class M {

    public static void mainMenu() {
        Scanner input =new Scanner(System.in);
        System.out.println("欢迎使用本系统");
        System.out.println("1.登录");
        System.out.println("2.注册");
        System.out.println("3.幸运抽奖");
        System.out.println("4.退出");
        System.out.println("请选择");
        int a=input.nextInt();
        switch(a){
        case 1:
            login();
            break;
        case 2:
            reg();
            break;
        case 3:
            lucky();
        }
    }
    public static void lucky(){
        //输入四位会员卡号，如果百位数等于随机数，幸运会员。否则不是。同时也要询问是否返回主菜单
        Scanner input=new Scanner(System.in);
        System.out.println("输入一个四位数");
        Random r=new Random();
        int x=r.nextInt(10);
        int num =input.nextInt();
        while (num<100||num>10000){
            System.out.println("输入有误，重新输入");
            num=input.nextInt();
            if(num >= 1000 && num < 10000){
                break;
            }
        }
        int bai =num%1000/100;
        if(bai==x){
            System.out.println("幸运会员");
        }else{
            System.out.println("不是幸运会员");
        }
        returnMain();
        
    }
    public static void returnMain(){
        Scanner input=new Scanner(System.in);
        System.out.println("是否返回主菜单？");
        if(input.next().equalsIgnoreCase("Y"))
            mainMenu();
        else
            System.out.println("谢谢使用");
        
    }
    public static void reg(){
         // TODO Auto-generated method stub
           Scanner input = new Scanner(System.in);
            System.out.println("输入要注册的用户名");
            String uname = input.next();
            System.out.println("输入注册密码");
            String upwd = input.next();
            System.out.println("注册成功");
            returnMain();

    }
    public static void login(){
           Scanner input = new Scanner(System.in);
            System.out.println("输入用户名");
            String uname = input.next();
            System.out.println("输入密码");
            String upwd = input.next();
           if(uname.equals("zs")&& upwd.equals("123")){
               System.out.println("ok");
           }else{
               System.out.println("fail");
           }
            returnMain();
}
    public static void main(String[] args){
        mainMenu();
    }
}