第十周作业java

package scc;

import java.util.Scanner;

public class SZ {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        mp();

    }
    public static void mp(){
        System.out.println("请输入5位数");
        Scanner input=new Scanner(System.in);
        int a[]=new int [5];
       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;j++){
                  if(a[j]>a[j+1]){
                  int temp=a[j];
                  a[j]=a[j+1];
                  a[j+1]=temp;
                  }
              }
          }
       for (int i : a) {
        System.out.println(i);
    }
}
}

 

2.编写一个方法，求整数n的阶乘，例如5的阶乘是1*2*3*4*5。 [必做题]

package scc;

import java.util.Scanner;

public class jieceng {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ab();
    }
    public static void ab(){
        Scanner input=new Scanner(System.in);
        int sum=1;
        int n=input.nextInt();
        for (int i = 1; i <=n; i++) {
            sum*=i;
            
        }
        System.out.println(sum );
    
        

    }

}

3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package scc;

import java.util.Scanner;

public class run {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        year();
    }
        public static void year() {
            Scanner input=new Scanner(System.in);
            int a=input.nextInt();
            if (a%4==0&&a%100!=0||a%400!=0) {
                System.out.println("闰年");
                
            }else{
                    System.out.println("平年");
                
            }
            
            
        }
        

    }

4.课堂没完成的menu菜单，实现幸运抽奖功能

package scc;

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

public class hui {
    
//    4.课堂没完成的menu菜单，实现幸运抽奖功能
    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 i=input.nextInt();
        switch(i){
            case(1):
                login();
            break;
            case(2):
                reg();
            break;
            case(3):
                luckly();
            break;
             
        }
    }
    public static void returnMenu(){
        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");
        }
    }
    private 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("1234")) {
            System.out.println("ok");
        }else{
            System.out.println("fail");
        }
        returnMenu();
    }
     
    private static void reg(){
        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("再次输入密码");
        String uppwd=input.next();
        if(upwd.equals(input())==uppwd.equals(input())){
            System.out.println("注册成功");
            System.out.println("用户名"+uname+"密码"+upwd);
        }else{
            System.out.println("密码错误");
        }
        returnMenu();
    }
     
    private static Object input() {
        // TODO Auto-generated method stub
        return null;
    }
    private static void luckly(){
        Scanner input=new Scanner(System.in);
        Random r=new Random();
        int luck=r.nextInt(10);
        System.out.println("输入四位数会员卡号");
        int id=input.nextInt();
        if (luck==id) {
            System.out.println("幸运会员");
        }else{
            System.out.println("不是幸运会员");
        }
        returnMenu();
    }
    public static void main(String[] args) {
    mainMenu();
 
    }
 
}