第四章第十题（猜测生日）(Guess birthday)

*4.10（猜测生日）改写程序清单4-3，提示用户输入字符Y代表“是”，输入N代表“否”，代替之前输入1表示“是”和0表示“否”。

*4.10(Guess birthday)(Guess birthday) Rewrite Listing 4.3, GuessBirthday.java, to prompt the user to enter the character Y for Yes and N for No, rather than entering 1 for Yes and 0 for No.

下面是参考答案代码:

import java.util.*;

public class GuessBirthdayQuestion10 {
  public static void main(String[] args) {
    String set1 = " 1  3  5  7\n" + " 9 11 13 15\n" + "17 19 21 23\n" + "25 27 29 31";
    String set2 = " 2  3  6  7\n" + "10 11 14 15\n" + "18 19 22 23\n" + "26 27 30 31";
    String set3 = " 4  5  6  7\n" + "12 13 14 15\n" + "20 21 22 23\n" + "28 29 30 31";
    String set4 = " 8  9 10 11\n" + "12 13 14 15\n" + "24 25 26 27\n" + "28 29 30 31";
    String set5 = "16 17 18 19\n" + "20 21 22 23\n" + "24 25 26 27\n" + "28 29 30 31";

    int day = 0;

    // Create a Scanner
    Scanner input = new Scanner(System.in);

    // Prompt the user to answer questions
    System.out.print("Is your birthday in Set1?\n");
    System.out.print(set1);
    System.out.print("\nEnter N for No and Y for Yes: ");
    String answer = input.next();

    if (answer.equalsIgnoreCase("Y"))
      day += 1;

    // Prompt the user to answer questions
    System.out.print("\nIs your birthday in Set2?\n");
    System.out.print(set2);
    System.out.print("\nEnter N for No and Y for Yes: ");
    answer = input.next();

    if (answer.equalsIgnoreCase("Y"))
      day += 2;

    // Prompt the user to answer questions
    System.out.print("\nIs your birthday in Set3?\n");
    System.out.print(set3);
    System.out.print("\nEnter N for No and Y for Yes: ");
    answer = input.next();

    if (answer.equalsIgnoreCase("Y"))
      day += 4;

    // Prompt the user to answer questions
    System.out.print("\nIs your birthday in Set4?\n");
    System.out.print(set4);
    System.out.print("\nEnter N for No and Y for Yes: ");
    answer = input.next();

    if (answer.equalsIgnoreCase("Y"))
      day += 8;

    // Prompt the user to answer questions
    System.out.print("\nIs your birthday in Set5?\n");
    System.out.print(set5);
    System.out.print("\nEnter N for No and Y for Yes: ");
    answer = input.next();

    if (answer.equalsIgnoreCase("Y"))
      day += 16;

    System.out.println("\nYour birthday is " + day + "!");
    input.close();
  }
}

运行效果：

注：编写程序要养成良好习惯
1.文件名要用英文，具体一点
2.注释要英文
3.变量命名要具体，不要抽象（如:a,b,c等等），形式要驼峰化
4.整体书写风格要统一（不要这里是驼峰，那里是下划线，这里的逻辑段落空三行，那里相同的逻辑段落空5行等等）
5.普通变量，方法名要小驼峰，类名要大驼峰，常量要使用全部大写加上下划线命名法
6.要学习相应的代码编辑器的一些常用快捷键，如：快速对齐等等