java第四次作业

package test;

import java.util.Scanner;

public class test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        System.out.println("输入一个年份");
        int year=input.nextInt();
        if (year%4==0&&year%100!=0||year%400==0) {
            System.out.println(year+"是闰年");
        } else {
            System.out.println(year+"不是闰年");
        }
    }

}

 

package test;

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

public class test2 {

    public static void main(String[] args) {
        System.out.println("请输入卡号");
        Scanner input=new Scanner(System.in);
        int h=input.nextInt();
        int x;
        x=h/100%10;
        Random r=new Random();
        int s=r.nextInt(10);
        System.out.println(s);
        if (x==s) {
            System.out.println("是幸运会员");
        } else {
            System.out.println("不是幸运会员");
        }
    }

}

 

 

package test;

import java.util.Scanner;

public class test2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        System.out.println("输入一个数");
        int x=input.nextInt();
        int y;
        if(x>0){
            y=x+3;
            System.out.println("y="+y);
        }else if(x==0){
            y=0;
            System.out.println("y="+y);
        }else{
            y=x*2-1;
            System.out.println("y="+y);
        }
            
            

    }

}

 

 

 

package test;

import java.util.Scanner;

public class test4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        System.out.println("输入第一条边");
        int a=input.nextInt();
        System.out.println("输入第二条边");
        int b=input.nextInt();
        System.out.println("输入第三条边");
        int c=input.nextInt();
        if (a+b>c||a+c>b||b+c>a) {
            System.out.println("是三角形");
        } else {
            System.out.println("不是三角形");
    }
    }

}

 

 

 作业：

package test;

import java.util.Scanner;

public class task1 {

    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 month=input.nextInt();
        int day;
        if (((year%4==0&&year%100!=0)||year%400==0)&&month==2) {
            day=29;
            System.out.println("该月的天数为"+day);
        } else if(month==1) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==2) {
            day=28;
            System.out.println("该月的天数为"+day);
        }else if(month==3) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==4) {
            day=30;
            System.out.println("该月的天数为"+day);
        }else if(month==5) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==6) {
            day=30;
            System.out.println("该月的天数为"+day);
        }else if(month==7) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==8) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==9) {
            day=30;
            System.out.println("该月的天数为"+day);
        }else if(month==10) {
            day=31;
            System.out.println("该月的天数为"+day);
        }else if(month==11) {
            day=30;
            System.out.println("该月的天数为"+day);
        }else if(month==12) {
            day=31;
            System.out.println("该月的天数为"+day);
        }
        
        
        
    }

}

 

 

 

package test;

import java.util.Scanner;

public class task2 {

    public static void main(String[] args) {
        System.out.println("请输入一个成绩");
        Scanner input=new Scanner(System.in);
        int chengji=input.nextInt();
        switch (chengji/10) {
        case 10:
            System.out.println("成绩的等级为A");
            break;
        case 9:
            System.out.println("成绩的等级为A");
            break;
        case 8:
            System.out.println("成绩的等级为B");
            break;
        case 7:
            System.out.println("成绩的等级为C");
            break;
        case 6:
            System.out.println("成绩的等级为D");
            break;
        
        default:
            System.out.println("成绩的等级为E");
            break;
        }

    }

}

 

 

 

package test;

import java.util.Scanner;

public class task3 {

    public static void main(String[] args) {
        System.out.println("请输入一个数");
        Scanner input=new Scanner(System.in);
        int num=input.nextInt();
        if (num%2==0) {
            System.out.println("此数是偶数");
        } else {
            System.out.println("此数是奇数");
        }

    }

}

 

 

 

package test;

import java.util.Scanner;

public class task4 {

    public static void main(String[] args) {
        System.out.println("请输入一个变量x");
        Scanner input=new Scanner(System.in);
        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");
        }

    }

}

 

 

package test;

import java.util.Scanner;

public class task5 {

    public static void main(String[] args) {
        System.out.println("请输入一个数");
        Scanner input=new Scanner(System.in);
        int a=input.nextInt();
        if (a%5==0&&a%6==0) {
            System.out.println("此数能被5和6整除");
        } else if(a%5==0)
        {
            System.out.println("此数能被5整除");
        }else if(a%6==0)
        {
            System.out.println("此数能被6整除");
        }else if(a%5!=0||a%6!=0)
        {
            System.out.println("此数不能被5或6整除");
        }

    }

}