# 第十周作业5.11

1.编写一个方法，实现冒泡排序（由小到大），并调用该方法

package week10;

public class M1 {
public static void maopao(int []a){

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;
}
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
int x[]={4,6,2,9,5,1,};
maopao(x);
for (int i = 0; i < x.length; i++) {
System.out.println(x[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 week10;

public class M2 {

public static int jiecheng(int n){
int sum=1;
for (int i=n; i>0; i--) {
sum=sum*i;

}
return sum;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(jiecheng(5));

}

}

3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package week10;

import java.util.Scanner;

public class M3 {

public static void nianfen(int year){
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) {
// TODO Auto-generated method stub(能被4整除但不能被100整除,或者能被400整除)
Scanner input=new Scanner(System.in);
System.out.println("请输入年份");
int year=input.nextInt();
nianfen(year);

}

}

package week10;
import java.util.Random;

import java.util.Scanner;

public class M4 {

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:
break;
case 2:
reg();
break;
case 3:
lucky();

}

}
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"))
else
System.out.println("谢谢使用");
}

private 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);
Random r=new Random();
int x=r.nextInt(9);
System.out.println("随机数为"+x);
System.out.println("输入四位会员卡号");
int unum=input.nextInt();
if(unum/100%10==x){
System.out.println("幸运会员");}
else
{
System.out.println("不是会员");
}
returnMain();
}

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();

}

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) {

}

}

posted @ 2021-05-11 19:48  崔明月  阅读(49)  评论(2编辑  收藏  举报