1. 键盘输入五位数字的会员卡号：38503

使用“/”和“%”运算符分解获得的会员卡每一位上的数字
将每一位数字求和

package com.company;
import java.util.Scanner;
public class Main {
    public static void fun(){
        System.out.println("请输入五位会员卡号：");
        Scanner scanner = new Scanner(System.in);
        int num;
        do{
            num = scanner.nextInt();
            if(num % 100000 !=0){
                System.out.println("输入有误！");
                continue;
            }else{
                break;
            }
        }while(true);
        int num1 = num/10000;
        int num2 = num/1000%10;
        int num3 = num/100%10;
        int num4 = num/10%10;
        int num5 = num%10;
        System.out.println("万位数："+num1);
        System.out.println("千位数："+num2);
        System.out.println("百位数："+num3);
        System.out.println("十位数："+num4);
        System.out.println("个位数："+num5);
    }
    public static void main(String[] args) {
        // write your code here
        fun();
    }
}

2. 键盘输入学生学号：20161103（2016 年+11 期+03 号）

使用“/”和“%”运算符分解学生学号获得年份期数和序号
并且输出
学生学号：20161103
学生入学年份：2016 年
学生期数：11 期
学生序号：03 号

package com.company;
import java.util.Scanner;
public class Main {
    public static void fun(){
        System.out.println("请输入学生学号：");
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int num1 = num/10000;
        int num2 = num/100%100;
        int num3 = num%100;
        System.out.println("学生学号："+num);
        System.out.println("学生入学年份："+num1);
        System.out.println("学生期数："+num2);
        System.out.println("学生序号："+num3);
    }
    public static void main(String[] args) {
    // write your code here
        fun();
    }
}

3. 编写万年历小程序

package com.company;
import java.util.Scanner;
public class Main {
    public static boolean isLeapYear(int year){
        boolean flag1 = (year%4==0);
        boolean flag2 = (year%100==0);
        boolean flag3 = (year%400==0);
        if((flag1&&!flag2)||(flag3)){
            return true;
        }
        return false;
    }
    private static int getDays(int month,boolean isLeap){
        int days = 30;
        switch (month){
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                days++;
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                days = 30;
                break;
            case 2:
                days = 28;
                if(isLeap)days++;
                break;
        }
        return days;
    }
    public static void fun(){
        System.out.println("请输入年：");
        Scanner scanner = new Scanner(System.in);
        int year = scanner.nextInt();
        System.out.println("请输入月：");
        int month = scanner.nextInt();
        boolean isLeap = isLeapYear(year);
        String string1 = isLeap ? "闰年" : "平年";
        System.out.println(year+"年是"+string1);
        int days = getDays(month,isLeap);
        System.out.println(year+"年"+month+"月天数："+days);
    }
    public static void main(String[] args) {
    // write your code here
        fun();
    }
}

4.循环录入 5 个学生 Java 课的学生成绩，统计分数大于等于 80 分的学生比例

package com.company;
import java.util.Scanner;
public class Main {
    public static void fun(){
        int count = 0;
        for(int i = 1 ; i <= 5 ; i++){
            System.out.println("请输入第"+i+"位同学的成绩");
            Scanner input = new Scanner(System.in);
            int n = input.nextInt();
            if(n>=80){
                count++;
            }
        }
        System.out.println("超过80分以上的学生人数："+count);
        System.out.println("超过80分以上的学生比例："+count*100/5+"%");
    }
    public static void main(String[] args) {
    // write your code here
        fun();
    }
}