Java第四次作业

1.

package Homework;

import java.util.Scanner;

public class ma {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入年份");
        int a=input.nextInt();
        if(a%4==0 && a%100!=0 || a%400==0){
            System.out.println("闰年");
        }else{
            System.out.println("平年");
        }

    }

}

 

 

2.

package Homework;

import java.util.Random;
import java.util.Scanner;

public class ma1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        Random r=new Random();
        System.out.println("请输入四位数");
        int a=input.nextInt();
        int b=r.nextInt();
        if(a%1000/100==b){
            System.out.println("幸运会员");
        }else{
            System.out.println("非幸运会员");
        }

    }

}

 

 

3.

package HomeWork;

import java.util.Scanner;

public class DDDD {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入x值");
        int x=input.nextInt();
        int y;
        if (x>0){
            y=x+3;
            System.out.println("y="+y);
        }
        if (x==0){
            y=0;
            System.out.println("y="+y);
        }
        if (x<0){
            y=x*2-1;
            System.out.println("y="+y);
        }

    }

 

 

4.

package HomeWork;

import java.util.Scanner;

public class DDDDD {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入三个正数");
        int a=input.nextInt();
        int b=input.nextInt();
        int c=input.nextInt();
        if((a+b)>c && (a+c)>b && (b+c)>a){
            System.out.println("能构成三角形");
        }
        else
            System.out.println("不能构成三角形");

    }

}

 

 

5.

package Homework;

import java.util.Scanner;

public class ma3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个月份");
        int m = input.nextInt();
        if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
         System.out.println("31天");
        }
        else if(m==2){
         System.out.println("28天");
        }
        else{
         System.out.println("30天");
    }

    }

}

 

 

6.

package Homework;

import java.util.Scanner;

public class ma3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("输入学生的成绩");
        int grade=input.nextInt();
        int x=grade/10;
        switch(x){
        case 10:System.out.println("A");break;
        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");
        }


    }

}

 

 

7.

package Homework;

import java.util.Scanner;

public class ma3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("输入一个数字");
        int a=input.nextInt();
        if(a%2==0&&a!=0){
            System.out.println("这个数是偶数");
        }
        else if(a%2!=0&&a!=0){
            System.out.println("这个数是奇数");
        }
        else{
            System.out.println("这个数是0");
        }
        


    }

}

 

 

8.

package Homework;

import java.util.Scanner;

public class ma3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("输入a的值");
        int a=input.nextInt();
        if(a==1||a==5||a==10)
            System.out.println("a="+a);
        else
            System.out.println("a=none");

        


    }

}

 

 

9.

package Homework;

import java.util.Scanner;

public class ma3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("输入一个数");
        int a=input.nextInt();
        if(a%5==0&&a%6==0)
            System.out.println("这个数能被5和6整除");
        else if(a%5==0&&a%6!=0)
            System.out.println("这个数能被5整除");
        else if(a%5!=0&&a%6==0)
            System.out.println("这个数能被6整除");
        else
            System.out.println("这个数不能被5和6整除");

    }

}