一段有趣的C++代码，五次选择猜出你的生日

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#C++实例运用 #C++有趣代码 #猜生日

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通过五组数字提问，利用二进制原理确定用户的生日日期。每组选择排除部分可能，最终得出确切日期。

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程序代码：GuessBirthDate.cpp

/**
 * 运行程序，做5次选择，就能知道你的生日是哪一天。
 */
#include <iostream>
using namespace std;
 
int main()
{
    int date = 0; // Date to be determind
    char answer;
 
    // Prompt the user for Set 1
    cout << "Is your birth date in this set ?" << endl;
    cout << "16 17 18 19\n" <<
            "20 21 22 23\n" <<
            "24 25 26 27\n" <<
            "28 29 30 31"   << endl;
    cout << "Enter N for No and Y for Yes: ";
    cin >> answer;
 
    if (answer == 'Y')
        date += 16;
 
    // Prompt the user for Set 2
    cout << "Is your birth date in this set ?" << endl;
    cout << " 8  9 10 11\n" <<
            "12 13 14 15\n" <<
            "24 25 26 27\n" <<
            "28 29 30 31"   << endl;
    cout << "Enter N for No and Y for Yes: ";
    cin >> answer;
 
    if (answer == 'Y')
        date += 8;
 
    // Prompt the user for Set 3
    cout << "Is your birth date in this set ?" << endl;
    cout << " 1  3  5  7\n" <<
            " 9 11 13 15\n" <<
            "17 19 21 23\n" <<
            "25 27 29 31"   << endl;
    cout << "Enter N for No and Y for Yes: ";
    cin >> answer;
 
    if (answer == 'Y')
        date += 1;
 
    // Prompt the user for Set 4
    cout << "Is your birth date in this set ?" << endl;
    cout << " 2  3  6  7\n" <<
            "10 11 14 15\n" <<
            "18 19 22 23\n" <<
            "26 27 30 31"   << endl;
    cout << "Enter N for No and Y for Yes: ";
    cin >> answer;
 
    if (answer == 'Y')
        date += 2;
 
    // Prompt the user for Set 5
    cout << "Is your birth date in this set ?" << endl;
    cout << " 4  5  6  7\n" <<
            "12 13 14 15\n" <<
            "20 21 22 23\n" <<
            "28 29 30 31"   << endl;
    cout << "Enter N for No and Y for Yes: ";
    cin >> answer;
 
    if (answer == 'Y')
        date += 4;
 
    cout << "Your birth date is " << date << endl;
 
    return 0;
}

运行结果：

Is your birth date in Set1?
16 17 18 19
20 21 22 23
24 25 26 27
28 29 30 31
Enter N for No and Y for Yes: N

Is your birth date in Set2?
 8  9 10 11
12 13 14 15
24 25 26 27
28 29 30 31
Enter N for No and Y for Yes: Y

Is your birth date in Set3?
 1  3  5  7
 9 11 13 15
17 19 21 23
25 27 29 31
Enter N for No and Y for Yes: Y

Is your birth date in Set4?
 2  3  6  7
10 11 14 15
18 19 22 23
26 27 30 31
Enter N for No and Y for Yes: Y

Is your birth date in Set5?
 4  5  6  7
12 13 14 15
20 21 22 23
28 29 30 31
Enter N for No and Y for Yes: N
Your birth date is 11
Press any key to continue

简单分析一下：

一个月最多31天，
而 2^5-1 = 31 = 11111（二进制）
所以5个0/1的组合（二进制）可以表示一个月的每一天。

接下来就可以用每组数来排除各种可能性。

比如说你在第一组数时回答否，
那么说明你的生日的二年制表示时的最高位不为1
其他组依次类推就能得出结果了