关于身份证查验生日的事的一些解释

这连我自己也看不清我写了什么

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#include<iostream>
#define NOMINMAX

using namespace std;

struct Birthday
{
	int y, m, d;
	friend ostream& operator<<(ostream& os, Birthday& b)
	{
		os << b.y << "-" << b.m << "-" << b.d;
		return os;
	}
	operator long()
	{
		return y * 10000 + m * 100 + d;
	}
};


long getBirthdayNumberFromID(long);
Birthday getBirthdayFromBirthdayNumber(long);
Birthday getBirthdayFromID(long);


int main()
{
	return 0;
}

long getBirthdayNumberFromID(long id)
{
	long a = id % 1000000000000;
	long b = a / 10000;
	return b;
}

Birthday getBirthdayFromBirthdayNumber(long b)
{
	Birthday birthday = { b / 10000,b % 10000 / 100,b % 10000 % 100 };
	return birthday;
}

Birthday getBirthdayFromID(long id)
{
	return getBirthdayFromBirthdayNumber(getBirthdayNumberFromID(id));
}

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结果

注：kkksc03是洛谷站长

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