import java.util.Scanner;
public class FinalTest {

    public static void Test_1(){
        /*
        * 运用算数运算将5678转换为8765
        * */
        int num = 5678;
        int a;  //个位
        int b;  //十位
        int c;  //百位
        int d;  //千位

        a = num % 10;
        b = num / 10 % 10;
        c = num / 100 % 10;
        d = num / 1000 % 10;
//        System.out.println(d);

        int num2 = a*1000 + b*100 + c*10 + d;
        System.out.println(num2);

    }

    public static void Test_2(){
        /*
        * 四叶玫瑰数: 4位数 个位 十位 百位 千位的4次方之和等于数字本身
        */
        int num = 1000;

        for (; num <= 9999; num++){
            int a = num % 10;
            int b = num / 10 % 10;
            int c = num / 100 % 10;
            int d = num / 1000 % 10;
            if (a*a*a*a + b*b*b*b + c*c*c*c + d*d*d*d == num){
                System.out.println("四叶玫瑰数字! " + num);
            }
        }

    }
    public static void Test_3(){
        /*
        * 计算机输出: 请输入钢笔的价格(元):
        * 用户输入: 15
        * 计算机输出: 请输入水杯的价格(元):
        * 用户输入: 22
        * 计算机输出: 一共需要支付37.0元*/
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入钢笔的价格(元): ");
        float pen = sc.nextInt();
        System.out.print("请输入水杯的价格(元): ");
        float cup = sc.nextInt();
        System.out.println("一共需要支付" + (pen + cup) + "元");

    }
    public static void Test_4(){
        /*
        * 从键盘输入数据, 猜猜小慕的年龄, 一共三次机会
        */
        int true_age = 18;
        int count = 0;
        Scanner sc = new Scanner(System.in);
        System.out.println("猜猜小慕的年龄, 一共三次机会!");

        while (count < 3){
            count++;
            System.out.print("第" + count + "次: ");
            int age = sc.nextInt();
            if (age != true_age){
                if (count < 3) {
                    System.out.println("猜错啦, 再试试!");
                    continue;
                }
            }else {
                System.out.println("猜对啦! 就是" + age + "岁");
                break;
            }
            System.out.println("没机会啦!");
        }

    }
    public static void Test_5(){
        /*
        * for循环遍历输出一节车厢10排的座位号, 每排有A B C D和F, 一共10节
        */

        for (int case_ = 1; case_ <= 10; case_++){
            for (int seat_ = 1; seat_ <= 5; seat_++){
                if (seat_ == 1){
                    System.out.print(case_ + "A ");
                } else if (seat_ == 2){
                    System.out.print(case_ + "B ");
                } else if (seat_ == 3){
                    System.out.print(case_ + "C ");
                } else if (seat_ == 4){
                    System.out.print(case_ + "D ");
                } else if (seat_ == 5){
                    System.out.print(case_ + "F ");
                }

            }
            System.out.println("\t");
        }

    }




    public static void main(String[] args) {
        Test_1();
        Test_2();
        Test_3();
        Test_4();
        Test_5();
    }
}

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