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|---|---|---|
| @@ -1,74 +1,71 @@ | ||
| //! @Alan | ||
| //! | ||
| //! Exercise 9.51: | ||
| //! Write a class that has three unsigned members representing year, | ||
| //! month, and day. Write a constructor that takes a string representing | ||
| //! a date. Your constructor should handle a variety of date formats, | ||
| //! such as January 1, 1900, 1/1/1900, Jan 1, 1900, and so on. | ||
| //! | ||
| // Exercise 9.51: | ||
| // Write a class that has three unsigned members representing year, month, and day. | ||
| // Write a constructor that takes a string representing a date. Your constructor should handle a | ||
| // variety of date formats, such as January 1, 1900, 1/1/1900, Jan 1, 1900, and so on. | ||
|
|
||
| #include <array> | ||
| #include <iostream> | ||
| #include <string> | ||
| #include <vector> | ||
|
|
||
| class wy_Date { | ||
| class Date { | ||
| public: | ||
| wy_Date(const std::string& s); | ||
| unsigned year; | ||
| unsigned month; | ||
| unsigned day; | ||
| explicit Date(const std::string& str = ""); | ||
| void Print(); | ||
| unsigned year = 1970; | ||
| unsigned month = 1; | ||
| unsigned day = 1; | ||
|
|
||
| private: | ||
| std::array<std::string, 12> month_names{"Jan", "Feb", "Mar", "Apr", "May", "Jun", | ||
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; | ||
| unsigned MonthFromName(const std::string& str); | ||
| }; | ||
|
|
||
| int main() | ||
| Date::Date(const std::string& str) | ||
| { | ||
| wy_Date d("99/21/3871"); | ||
|
|
||
| std::cout << d.day << " " << d.month << " " << d.year << " "; | ||
|
|
||
| return 0; | ||
| if (str.empty()) return; | ||
| std::string delimiters{" ,/"}; | ||
| auto month_day_delim_pos = str.find_first_of(delimiters); | ||
| if (month_day_delim_pos == std::string::npos) | ||
| throw std::invalid_argument("This format is not supported now."); | ||
| month = MonthFromName(str.substr(0, month_day_delim_pos)); | ||
| auto day_year_delim_pos = str.find_first_of(delimiters, month_day_delim_pos + 1); | ||
| auto day_len = day_year_delim_pos - month_day_delim_pos - 1; | ||
| day = std::stoi(str.substr(month_day_delim_pos + 1, day_len)); | ||
| year = std::stoi(str.substr(day_year_delim_pos + 1)); | ||
| } | ||
|
|
||
| wy_Date::wy_Date(const std::string& s) | ||
| void Date::Print() | ||
| { | ||
| unsigned format = 0; | ||
|
|
||
| //! 1/1/1900 | ||
| if (s.find_first_of("/") != std::string::npos) format = 0x10; | ||
|
|
||
| //! Jan 1, 1900 | ||
| if (s.find_first_of(",") >= 4 && s.find_first_of(",") != std::string::npos) | ||
| format = 0x01; | ||
|
|
||
| switch (format) { | ||
|
|
||
| //! format = 1/1/1900 | ||
| case 0x10: | ||
| day = std::stoi(s.substr(0, s.find_first_of("/"))); | ||
| month = std::stoi(s.substr(s.find_first_of("/") + 1, | ||
| s.find_last_of("/") - s.find_first_of("/")-1)); | ||
| year = std::stoi(s.substr(s.find_last_of("/") + 1, 4)); | ||
| break; | ||
|
|
||
| //! format = January 1, 1900 or Jan 1, 1900 | ||
| case 0x01: | ||
| day = std::stoi( | ||
| s.substr(s.find_first_of("1234567890"), | ||
| s.find_first_of(",") - s.find_first_of("1234567890"))); | ||
|
|
||
| if (s.find("Jan") < s.size()) month = 1; | ||
| if (s.find("Feb") < s.size()) month = 2; | ||
| if (s.find("Mar") < s.size()) month = 3; | ||
| if (s.find("Apr") < s.size()) month = 4; | ||
| if (s.find("May") < s.size()) month = 5; | ||
| if (s.find("Jun") < s.size()) month = 6; | ||
| if (s.find("Jul") < s.size()) month = 7; | ||
| if (s.find("Aug") < s.size()) month = 8; | ||
| if (s.find("Sep") < s.size()) month = 9; | ||
| if (s.find("Oct") < s.size()) month = 10; | ||
| if (s.find("Nov") < s.size()) month = 11; | ||
| if (s.find("Dec") < s.size()) month = 12; | ||
| std::cout << year << "-" << month << "-" << day << "\n"; | ||
| } | ||
|
|
||
| year = std::stoi(s.substr(s.find_last_of(" ") + 1, 4)); | ||
| break; | ||
| unsigned Date::MonthFromName(const std::string& str) | ||
| { | ||
| if (str.empty()) return 0; | ||
| if (std::isdigit(str[0])) return std::stoi(str); | ||
| for (size_t i = 0; i != 12; ++i) { | ||
| if (str.find(month_names[i]) != std::string::npos) return i + 1; | ||
| } | ||
| return 0; // not found | ||
| } | ||
|
|
||
| int main() | ||
| { | ||
| { // default case | ||
| auto date = Date(); | ||
| date.Print(); | ||
| } | ||
| { // case 0: January 1, 1900 | ||
| auto date = Date("January 1, 1900"); | ||
| date.Print(); | ||
| } | ||
| { // case 1: 1/1/1900 | ||
| auto date = Date("1/1/1900"); | ||
| date.Print(); | ||
| } | ||
| { // case 2: Jan 1, 1900 | ||
| auto date = Date("Jan 1, 1900"); | ||
| date.Print(); | ||
| } | ||
| } |