第二次作业

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;
        }
    }

}

 

 

 

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. 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. 
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. 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. 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. 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. 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. 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");
        }

}