2020.4.24

3.闰年

package ggd;
import java.util.Scanner;

public class jc {
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int a=input.nextInt();
        
System.out.println("输入年份");
if(a%4==0&&a%100!=0||a%400==0){
    System.out.println(a+"是闰年");
    
}else{
System.out.println(a+"不是闰年");
}}

}
    

2.阶乘

package ggd;
import java.util.Scanner;

public class jc {
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int a=input.nextInt();
int sum=1;
for(int i=1;i<=a;i++){
    sum=sum*i;
    System.out.println(a+"的阶乘为："+sum);
}
    }}

 1

package leis;

import java.util.Scanner;

public class Menu {
    public static void main(String[] args) {
        mainMenu();
    }

    public static void mainMenu() {
        Scanner input = new Scanner(System.in);
        System.out.println("1.登录");
        System.out.println("2.注册");
        System.out.println("3.幸运抽奖,输入四位会员卡号,如果百位等于系统随机数,就是星运会员.否则不是.");
        System.out.println("4.看小故事,");
        System.out.println("5.退出系统");
        System.out.println("请选择");
        int i = input.nextInt();
        switch (i) {
        case 1:
            login();
            break;
        case 2:
            abbMain();
            break;
        case 3:
            cbbMain();
            break;
        case 4:
            dbbMain();
            break;
        case 5:
            ebbMain();
            
        }
    }

    private static void login() {
        // TODO Auto-generated method stub
        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("登录成功");
        } else {
            System.out.println("登录失败");
        }
        returnMain();
    
    }
    public static void returnMain(){
        System.out.println("是否返回主菜单?Y/N");
        Scanner input = new Scanner(System.in);
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        }else{
            System.out.println("谢谢使用");
        }

    }

    
    public static void abbMain(){                                       //注册
    // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("注册");
        System.out.println("注册用户名");
        String u= input.next();
        System.out.println("设置密码");
        String ba = input.next();
        if (u.equals("zs") && ba.equals("123")) {
            System.out.println("登录成功");
        } else {
            System.out.println("登录失败");
        }
        returnMain();
}
    public static void cbbMain(){                   //抽奖
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("幸运抽奖");
   
   
        for(int m=0;m<=100;m++){
            if(m==50){
                System.out.println("恭喜中奖");
            }else{
                System.out.println("谢谢惠顾");
                
            }
            
            
        }
        
        
    }
    public static void dbbMain(){                           //看小故事
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("看小故事");
        returnMain();
        
    }
    

    
    
    public static void ebbMain(){                           
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
    System.out.println("退出系统");
    mainMenu();
    }}