用switch实现报数题

[qq_42337384]

8人一排，第一个开始报数，求8411250。 ADCDEFGH 1→2→3→4…8 15←14←13.…←9

[十八道胡同]

请说的详细点，谢谢

[qq_42337384]

A开始报数，每报14个数又回到A, 用 switch求出谁报的8411250

[qq_39936465]

import java.util.Scanner;

public class test5 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int remainder, quotient, divisor;
		Scanner sc = new Scanner(System.in);
		while (true) {
			System.out.print("请输入一个整数：");
			divisor = sc.nextInt();
			quotient = Math.floorDiv(divisor, 8);
			remainder = divisor % 8;
			if (remainder == 0) {
				remainder = 8;
				quotient--;
			}
			if ((quotient % 2) != 0) {
				remainder = 9 - remainder;
			}
			switch (remainder) {
			case 1:
				System.out.println("A");
				break;
			case 2:
				System.out.println("B");
				break;
			case 3:
				System.out.println("C");
				break;
			case 4:
				System.out.println("D");
				break;
			case 5:
				System.out.println("E");
				break;
			case 6:
				System.out.println("F");
				break;
			case 7:
				System.out.println("G");
				break;
			case 8:
				System.out.println("H");
				break;
			}

		}

	}

}

[zhangphh]

最简单的方法，就是与16取余

public class Test {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();//输入第x个人
        int y = x%16;
        if(y == 0)
            System.out.println("A");
        switch(y){
            case 2:
            case 15:
                System.out.println("B");
                break;
            case 3:
            case 14:
                System.out.println("C");
                break;
            case 4:
            case 13:
                System.out.println("D");
                break;
            case 5:
            case 12:
                System.out.println("E");
                break;
            case 6:
            case 11:
                System.out.println("F");
                break;

            case 7:
            case 10:
                System.out.println("G");
                break;
            case 8:
            case 9:
                System.out.println("H");
                break;
        }
    }
}

如果想重复输入，可以提取出来成为一个单独的方法用while(true)

[zhangphh]

上面代码少了个东西

public class Test {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();//输入第x个人
        int y = x%16;
        if(y == 0 || y == 1)
            System.out.println("A");
        switch(y){
            case 2:
            case 15:
                System.out.println("B");
                break;
            case 3:
            case 14:
                System.out.println("C");
                break;
            case 4:
            case 13:
                System.out.println("D");
                break;
            case 5:
            case 12:
                System.out.println("E");
                break;
            case 6:
            case 11:
                System.out.println("F");
                break;

            case 7:
            case 10:
                System.out.println("G");
                break;
            case 8:
            case 9:
                System.out.println("H");
                break;
        }
    }
}

[RUA好多鱼~]

为啥要对16取余？

[zhangphh]

因为从开始每两行就会重复执行与之前两行相似的过程，所得结果也会与前面两行对应相等