Java第四次作业

上机练习：

1.输入一个年份,判断是不是闰年(能被4整除但不能被100整除,或者能被400整除)

 1 package Test;
 2 
 3 import java.util.Random;
 4 import java.util.Scanner;
 5 
 6 public class Geng1 {
 7 
 8     public static void main(String[] args) {
 9         // TODO Auto-generated method stub
10         Scanner input = new Scanner(System.in);
11         System.out.println("请输入一个四位数");
12         int a = input.nextInt();
13         Random r = new Random();
14         int b = r.nextInt(10);
15         if (b == a / 100 % 10) {
16             System.out.println("是幸运会员");
17         } 
18         else {
19             System.out.println("不是幸运会员");
20         }
21 
22     }
23 
24 }

2.输入一个4位会员卡号,如果百位数字是随机数,就输出是幸运会员,否则就输出不是.

 1 package Test;
 2 
 3 import java.util.Random;
 4 import java.util.Scanner;
 5 
 6 public class Geng1 {
 7 
 8     public static void main(String[] args) {
 9         // TODO Auto-generated method stub
10         Scanner input = new Scanner(System.in);
11         System.out.println("请输入一个四位数");
12         int a = input.nextInt();
13         Random r = new Random();
14         int b = r.nextInt(10);
15         if (b == a / 100 % 10) {
16             System.out.println("是幸运会员");
17         } 
18         else {
19             System.out.println("不是幸运会员");
20         }
21 
22     }
23 
24 }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng2 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9 
10         // TODO Auto-generated method stub
11         Scanner input = new Scanner(System.in);
12         System.out.println("请输入x的值");
13         int x = input.nextInt();
14         int y = 0;
15         if (x > 0) {
16             y = x + 3;
17         } 
18         else if (x < 0) {
19             y = x * 2 - 1;
20         } 
21         else {
22             y = 0;
23         }
24         System.out.println("y=" + y);
25     }
26 
27     }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng3 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入三个数");
11         int a = input.nextInt();
12         int b = input.nextInt();
13         int c = input.nextInt();
14         if (a + b > c && a + c > b && b + c > a) {
15             System.out.println("a、b、c可以组成三角形");
16         } 
17         else {
18             System.out.println("a、b、c不能组成三角形");
19         }
20 
21     }
22 
23 }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng4 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入年份");
11         int year = input.nextInt();
12         System.out.println("请输入月份");
13         int month = input.nextInt();
14         switch (month) {
15         case 4:
16         case 6:
17         case 9:
18         case 11:
19             System.out.println("该月份有30天");
20             break;
21         case 2:
22             if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
23                 System.out.println("该月份有29天");
24             } 
25             else {
26                 System.out.println("该月份有28天");
27             }
28             break;
29         default:
30             System.out.println("该月份有31天");
31             break;
32         }
33 
34     }
35 
36 }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng5 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入成绩");
11         int a = input.nextInt();
12         switch (a/10) {
13         case 10:
14         case 9:
15             System.out.println("A");
16             break;
17         case 8:
18             System.out.println("B");
19             break;
20         case 7:
21             System.out.println("C");
22             break;
23         case 6:
24             System.out.println("D");
25             break;
26         default:
27             System.out.println("E");
28             break;
29         }
30     }
31 
32 }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng6 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入一个数");
11         int a = input.nextInt();
12         if (a % 2 == 0 && a != 0) {
13             System.out.println("该数为偶数");
14         } 
15         else if (a == 0) {
16             System.out.println("该数非奇非偶");
17         } 
18         else {
19             System.out.println("该数为偶数");
20         }
21     }
22 
23     }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng7 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入x的值");
11         int x = input.nextInt();
12         if (x == 1 || x == 5 || x == 10) {
13             System.out.println("x=" + x);
14         } 
15         else {
16             System.out.println("x=none");
17         }
18 
19     }
20     }

 1 package Test;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Geng8 {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in);
10         System.out.println("请输入一个数");
11         int a = input.nextInt();
12         if (a % 5 == 0 && a % 6 == 0) {
13             System.out.println("能被5和6整除");
14         } 
15         else if (a % 5 == 0 && a % 6 != 0) {
16             System.out.println("只能被5整除");
17         } 
18         else if (a % 5 != 0 && a % 6 == 0) {
19             System.out.println("只能被6整除");
20         } 
21         else {
22             System.out.println("不能被5或6整除");
23         }
24 
25     }
26 
27 }

posted @ 2021-03-28 20:47  计算机1905geng  阅读(52)  评论(0)  编辑  收藏  举报