java第二次作业
1.输入年份月份,输出该月的天数(闰年2月29天,条件参考上机练习1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
package aaa; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub System. out .println( "请输入年份:" ); Scanner in = new Scanner(System. in ); int a= in .nextInt(); System. out .println( "请输入月份:" ); int b= in .nextInt(); switch (b) { case 4: case 6: case 9: case 11: System. out .println( "30天" ); break ; case 2: if (a%4==0&&a%100!=0||a%400==0){ System. out .println( "29天" ); } else { System. out .println( "28天" ); } break ; default : System. out .println( "31天" ); break ; } } } |
2。给定一个成绩a,使用switch结构求出a的等级
。A:90-100,B:80-89,C:70-79,D:60-69,E:0~59
package aaa; import java.net.MulticastSocket; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入成绩:"); int b=in.nextInt(); switch(b/10) { case 10: case 9: System.out.println("A"); break; case 8: System.out.println("B"); break; case 7: System.out.println("C"); break; case 6: System.out.println("D"); break; default: System.out.println("E"); break; } } }
3.输入一个数字,判断是一个奇数还是偶数
package aaa; import java.net.MulticastSocket; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入一个数:"); int a=in.nextInt(); if(a%2==1) { System.out.println("奇数"); } else { System.out.println("偶数"); } } }
4.编写程序, 判断一个变量x的值,如果是1, 输出x=1,如果是5,输出x=5,如果是 10,输出 x=10,除了以上几个值,都输出x=none。
package aaa; import java.net.MulticastSocket; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入一个数:"); int x=in.nextInt(); switch(x) { case 1: System.out.println("1"); break; case 5: System.out.println("5"); break; case 10: System.out.println("10"); break; default: System.out.println("none"); break; } } }
5.判断一个数字是否能被5和6同时整除(打印能被5和6整除),或只能被5整除(打印能被5整除 ),或只能被6整除,(打印能被6整除),不能被5或6整除,(打印不能被5或6整除)
package aaa; import java.net.MulticastSocket; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入一个数:"); int x=in.nextInt(); if(x%5==0&&x%6==0) System.out.println("打印能被5和6整除"); else if(x%5==0&&x%6!=0) System.out.println("打印能被5整除"); else if(x%6==0&&x%5!=0) System.out.println("打印能被6整除"); else System.out.println("打印不能被5或6整除"); } }
6.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)
package aaa; import java.net.MulticastSocket; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入一个年份:"); int x=in.nextInt(); if(x%4==0&&x%100!=0||x%400==0) System.out.println("是闰年"); else System.out.println("不是闰年"); } }
7.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.
package aaa; import java.net.MulticastSocket; import java.util.Random; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); Random r=new Random(); int a=r.nextInt(10); System.out.println("幸运百位数是:"+a); System.out.println("请输入会员卡号:"); int x=in.nextInt(); if(x%1000/100==a) System.out.println("是幸运会员"); else System.out.println("不是幸运会员"); } }
8.
已知函数,输入x的值,输出对应的y的值.
x + 3 ( x > 0 )
y = 0 ( x = 0 )
x*2 –1 ( x < 0 )
package aaa; import java.net.MulticastSocket; import java.util.Random; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入x:"); int x=in.nextInt(); int y; switch(x) { case 0: System.out.println("y=0"); break; default: if(x>0) y=x+3; else y=x*2-1; System.out.println("y="+y); } } }
9.输入三个数,判断能否构成三角形(任意两边之和大于第三边)
package aaa; import java.net.MulticastSocket; import java.security.DrbgParameters.NextBytes; import java.util.Random; import java.util.Scanner; public class aaa { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入三个数:"); System.out.println("请输入x:"); int x=in.nextInt(); System.out.println("请输入y:"); int y=in.nextInt(); System.out.println("请输入z:"); int z=in.nextInt(); if(x+y>z&&x+z>y&&y+z>x) System.out.println("能组成三角形"); else System.out.println("不能组成三角形"); } }