第二次作业

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入年份:");

        Scanner input=new Scanner(System.in);

        int year=input.nextInt();

        System.out.println("请输入月份:");

        int m=input.nextInt();

        switch(m) {

            case 1:

            case 3:

            case 5:

            case 7:

            case 8:

            case 10:

            case 12:

                System.out.println("31天");

                break;

            case 2:

                if(year%4==0&&year%100!=0||year%400==0) {

                    System.out.println("29天");

                }else {

                    System.out.println("28天");

                }

                break;

            default:

                System.out.println("30天");

                break;

        }
    }
}

 

 

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入一个数字:");

        Scanner input=new Scanner(System.in);

        int a=input.nextInt();

        switch(a/10) {

            case 10:

            case 9:

                System.out.println("等级为A");

                break;

            case 8:

                System.out.println("等级为B");

                break;

            case 7:

                System.out.println("等级为C");

                break;

            case 6:

                System.out.println("等级为D");

                break;

            case 5:

            case 4:

            case 3:

            case 2:

            case 1:

                System.out.println("等级为E");

                break;

            default:

        }
    }
}

 

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入一个数字:");

        Scanner input=new Scanner(System.in);

        int a=input.nextInt();

        if(a%2==0) {

            System.out.println("为偶数");



        }else {

            System.out.println("为奇数");

        }
    }
}

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入一个数字:");

        Scanner input = new Scanner(System.in);

        int x = input.nextInt();

        if (x == 1) {

            System.out.println("x=" + x);

        } else if (x == 5) {

            System.out.println("x=" + x);

        } else if (x == 10) {

            System.out.println("x=" + x);

        } else {

            System.out.println("x=none");

        }

    }

    }

 

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入一个数字:");

        Scanner input=new Scanner(System.in);

        int x=input.nextInt();

        if(x%5==0&&x%6==0) {

            System.out.println("x能被5和6整除");

        }else if(x%5==0) {

            System.out.println("x能被5整除");

        }else if(x%6==0) {

            System.out.println("x能被6整除");

        }else {

            System.out.println("x不能被5或者6整除");

        }

    }

package aaa;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入一个年份:");

        Scanner input=new Scanner(System.in);

        int year=input.nextInt();

        if((year%4==0&&year%100!=0)||year%400==0) {

            System.out.println("是闰年");

        }else {

            System.out.println("不是闰年");

        }


    }
    }

    }

 

package aaa;
import java.util.Random;


import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Random s= new Random();

        Scanner input = new Scanner(System.in);

        System.out.println("请输入一个4位会员卡号");

        int a=input.nextInt();

        int b=s.nextInt(10);

        if(a/10%100==b)

            System.out.println("恭喜你是幸运会员");

        else

            System.out.println("很遗憾你不是幸运会员");
    }
    }

 

package aaa;
import java.util.Random;


import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入x的值");
        Scanner input=new Scanner(System.in);
        int x=input.nextInt();

        if(x>0)

            System.out.println("y的值为："+(x+3));

        else if(x==0)

            System.out.println("y的值为："+(x+0));

        else if(x<0)

            System.out.println("y的值为："+(x*2-1));
    }

package aaa;
import java.util.Random;


import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);

        System.out.println("请输入第一个数");

        int a=sc.nextInt();

        System.out.println("请输入第二个数");

        int b=sc.nextInt();

        System.out.println("请输入第三个数");

        int c=sc.nextInt();

        if(a+b>c&&a+c>b&&b+c>a)

            System.out.println("可以构成三角形");

        else

            System.out.println("不可以构成三角形");
    }
    }

    }