java第四次作业

1. package ikk;

import java.util.Scanner;

public class jjil {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入年份");
        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");
        }
    }

}

 

 

 

 

 

2. package ikk;

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

public class asd {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入卡号");
        int x=input.nextInt();
        Random r=new Random();
        int a=r.nextInt(10);
        if ((x/10%10)==a) {
            System.out.println("是会员");
        } else {
            System.out.println("不是会员");
        }
    }

}

 

 

 

3. package ikk;

import java.util.Scanner;

public class S {

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

}

 

 

 

4. package ikk;

import java.util.Scanner;

public class AASD {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入第一边");
        int a=input.nextInt();
        System.out.println("输入第二边");
        int b=input.nextInt();
        System.out.println("输入第三边");
        int c=input.nextInt();
        if ((a+b>c)||(a-b<c)) {
            System.out.println("可以组成三角形");
        } else {
            System.out.println("不可以组成三角形");
        }
    }

}

 

 

 

 

 

 

 

package apex;

import java.util.Scanner;

public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入年份");
        int year=input.nextInt();
        System.out.println("输入月份");
        int month=input.nextInt();
        int day;
        switch (month) {
        case 4:
        case 6:
        case 9:
        case 11:
            System.out.println("该月有30天");
            break;
        case 2:
            if (year%4==0&&year%100!=0||year%400==0) {
                System.out.println("这月有29天");
                break;
            } else {
                System.out.println("这月有28天");
                break;                
}
            default:
                System.out.println("这月有31天");
                break;
    }
    }
}

 

 

 

package apex;

import java.util.Scanner;

public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Scanner input=new Scanner(System.in);
         System.out.println("请输入您的成绩");
         int a=input.nextInt();
         switch (a/10) {
        case 10:
        case 9:System.out.println("成绩为A");break;
        case 8:System.out.println("成绩为B");break;
        case 7:System.out.println("成绩为C");break;
        case 6:System.out.println("成绩为D");break;
            

        default:
            System.out.println("成绩为E");
            break;
    }
    }
}

 

 

 

package apex;

import java.util.Scanner;

public class apex {

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

 

 

package apex;

import java.util.Scanner;

public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Scanner input=new Scanner(System.in);
         System.out.println("请输入一个变量x");
         int x=input.nextInt();
         if (x==1) {
             System.out.println("x=1");
              }
         else if(x==5) {
             System.out.println("x=5");
         }
         else if(x==10) {
             System.out.println("x=10");
         }
         else {
          System.out.println("x=none");
    }
    }
}