第十周作业

import java.util.Scanner;

public class Texa1 {
public static void mp() {
System.out.println("请输入4个数字");
Scanner input = new Scanner(System.in);
int a[] = new int[4];
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);
}

}

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

}

}

 

 

import java.util.Scanner;

public class Texa1 {
public static void jiechen() {

System.out.println("请输入一个数");
jc();
}

public static void jc() {
int sum = 1;
Scanner input = new Scanner(System.in);
int a = input.nextInt();
for (int b = 1; b <= a; b++) {
sum= sum * b;
}
System.out.println("这个数的阶乘为" + sum);
}

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

 

 

import java.util.Scanner;

public class Texa1 {
public static void year() {

Scanner input = new Scanner(System.in);
System.out.println("输入年份");
int year = input.nextInt();
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
System.out.println("该年是闰年");
}
else {
System.out.println("该年是平年");
}
}

public static void main(String[] args) {

year();
}
}

 

 

import java.util.Random;
import java.util.Scanner;
public class Menu {

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:
xycj();
break;
}
}
public static void xycj(){
//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？Y/N");
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("666")){
System.out.println("ok");
}else{
System.out.println("fail");
}
returnMain();
}
public static void main(String[] args){
mainMenu();
}
}