第十周作业

1.编写一个方法,实现冒泡排序(由小到大),并调用该方法

package abc;

import java.util.Scanner;

public class ysc1 {
    public static void mppx() {
    	 Scanner input=new Scanner(System.in);
         System.out.println("请输入10个数");
         int []a=new int[10];
         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-i-1; j++) {
                 if(a[j]>a[j+1]){
                 int e=a[j];
                 a[j]=a[j+1];
                 a[j+1]=e;
             }
             }
         }
         System.out.println("冒泡排序后");
         for (int i = 0; i < a.length; i++) {
             System.out.println(a[i]);
         }
     }
     public static void main(String[] args) {
         // 1.编写一个方法,实现冒泡排序(由小到大),并调用该方法
         mppx();

     }

 
    }

  

 

 

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 abc;

public class ysc1 {
	public static void main(String[] args) {
        // TODO Auto-generated method stub
        int sum=getSum(5);
        System.out.println("阶乘="+sum);
    }

    private static int getSum(int n) {
        // TODO Auto-generated method stub
        if(n==1){
            return 1;
        }
        int temp=getSum(n-1);
        return temp*n;
    	 

     }

 
    }

  

 

 3.编写一个方法,判断该年份是平年还是闰年。[必做题]

package abc;

import java.util.Scanner;

public class ysc1 {
	public static void main(String[] args) {
        // TODO Auto-generated method stub
		  Scanner input=new Scanner(System.in);
	        System.out.println("请输入一个年份");
	        int year=input.nextInt();
	        if ((year%4==0&&year%100!=0||year%400==0)) {
	            System.out.println("该年份为闰年");
	        }
	        else{
	        System.out.println("该年份不是闰年");
	        }
	}
}

  

 

 4.课堂没完成的menu菜单,实现幸运抽奖功能

package abc;
import java.util.Scanner;
import java.util.Random;
public class ysc1 {
	public static void mainMenu() {
        // TODO Auto-generated method stub
		        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:
		            lucky();
		        }
		    }
		    private static void lucky() {
		        Scanner input=new Scanner(System.in);
		        Random r=new Random();
		        int x=r.nextInt(10);
		        System.out.println("幸运数字为"+x);
		        System.out.println("请输入四位幸运卡号");
		        int number=input.nextInt();
		        if (number/100%10==x) {
		            System.out.println("该卡号为幸运卡号");
		        }else{
		            System.out.println("该卡不是幸运卡号");
		        }
		        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 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 reg() {
		        Scanner input=new Scanner(System.in);
		        System.out.println("请输入要注册的用户名");
		        String uname=input.next();
		        System.out.println("请输入注册密码");
		        String upwd=input.next();
		        System.out.println("注册成功");
		        returnMain();
		    }



		    public static void main(String[] args) {
		        // TODO Auto-generated method stub
		        mainMenu();

		    }
	}

  

 

posted @ 2021-05-12 11:19  monster丶易  阅读(40)  评论(0编辑  收藏  举报