java第十次作业
1. 编写一个方法,实现冒泡排序(由小到大),并调用该方法
package wjy1; import java.util.Scanner; public class wjy { public static void Small(int a[]) { for (int i = 0; i < a.length; i++) { for (int j = i; j < a.length; j++) { if(a[i]>a[j]){ int temp = a[i]; a[i] = a[j]; a[j] = temp; } } } } public static void main(String[] args) { Scanner input = new Scanner(System.in); int []a = new int [5]; System.out.println("请输入5个整数!"); for (int i = 0; i < a.length; i++) { a[i] = input.nextInt(); } Small(a); /*for (int i : a) { System.out.println(i); }*/ for (int i = 0; i < a.length; i++) { System.out.print(a[i] + "\t"); } }
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。
package wjy1; import java.util.Scanner; public class wjy { public static int jc(int num) { int a= 1; for (int i = 1; i <= num; i++) { a*= i; } return a; } public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个整数,求其阶乘!"); int jc = jc(input.nextInt()); System.out.print(jc); } }
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]3.编写一个方法,判断该年份是平年还是闰年。
package wjy1; import java.util.Scanner; public class wjy { public static void year(int year) { if (year%4==0 && year%100!=0||year%400==0) { System.out.print(year + "年是闰年!"); } else { System.out.print(year + "年不是闰年!"); } } public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个年份,判断是否闰年!"); year(input.nextInt()); } }
[必做题]4.课堂没完成的menu菜单,实现幸运抽奖功能
package wjy1; import java.util.Random; import java.util.Scanner; public class wjy { Scanner input = new Scanner(System.in); 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: lucky(); } } 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 Random r = new Random(); Scanner input = new Scanner(System.in); int luck = r.nextInt(10); System.out.println("请输入一个4位会员卡号:"); int id = input.nextInt(); if (id%10/10==luck) { System.out.println(id + " 您是幸运会员!"); } else { System.out.print(id + " 您是普通会员!"); } System.out.println("\tluck = "+luck); 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 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("123")){ System.out.println("ok"); }else{ System.out.println("fail"); } returnMain(); } public static void main(String[] args) { mainMenu(); } }