exercise9_51.cpp

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class date
{
private:
	unsigned year, month, day;

public:
	date(const string& s)
	{
		if (s.find_first_of("/") != string::npos)
			convert1(s);
		else if (s.find_first_of(",") != string::npos)
			convert2(s);
		else if (s.find_first_of(" ") != string::npos)
			convert3(s);
		else
			year = 1900, month = 1, day = 1;
	}

	void print()
	{
		cout << "day:" << day << " " << "month: " << month << " " << "year: " << year << endl;
	}

private:
	void convert1(const string& s)
	{
		day = stoi(s.substr(0, s.find_first_of("/")));
		month = stoi(s.substr(s.find_first_of("/") + 1, s.find_last_of("/") - s.find_first_of("/")));
		year = stoi(s.substr(s.find_last_of("/") + 1, 4));
	}
	void convert2(const string& s)
	{
		convert_month(s);
		day = stoi(s.substr(s.find_first_of("123456789"), s.find_first_of(",") - s.find_first_of("123456789")));
		year = stoi(s.substr(s.find_last_of(',') + 1, 4));
	}
	void convert3(const string& s)
	{
		convert_month(s);
		day = stoi(s.substr(s.find_first_of("123456789"), s.find_first_of(" ") - s.find_first_of("123456789")));
		year = stoi(s.substr(s.find_last_of(' ') + 1, 4));
	}

	void convert_month(const string& s)
	{
		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;
	}
};

int main()
{
	date d1("9/5/1990");
	date d2("January 7,1970");
	date d3("Jan 11 1942");

	d1.print();
	d2.print();
	d3.print();

	return 0;
}