An interesting code, guess birthday

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Transfer from: http: //www.oschina.net/code/snippet_10896_2907

[Code] GuessBirthDate.cpp

/**
 * 一段有趣的代码，猜生日。
 * 运行程序，做5次选择，就能知道你的生日是哪一天。神奇！
 */
#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;
}

 

[Code] test my birthday

david@xmimx:GuessBirthDate$ ./GuessBirthDate 
Is your birth date in this set ?
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 this set ?
 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 this set ?
 1  3  5  7
 9 11 13 15
17 19 21 23
25 27 29 31
Enter N for No and Y for Yes: N
Is your birth date in this set ?
 2  3  6  7
10 11 14 15
18 19 22 23
26 27 30 31
Enter N for No and Y for Yes: N
Is your birth date in this set ?
 4  5  6  7
12 13 14 15
20 21 22 23
28 29 30 31
Enter N for No and Y for Yes: Y
Your birth date is 12

Reproduced in: https: //my.oschina.net/dake/blog/196705