68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
// 设计一个类层次，基类为Date，从Date分别派生出ShortE、MediumDate和LongDate.他们各自有成员函数print()，输出当前日期。
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// Date输出日期格式为：04-14-2018
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// ShortE输出日期格式为：14-04-2018
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// MediumDate输出日期格式为：Apr.14,2018
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// LongDate输出日期格式为：April 14, 2018
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// class Date
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// {
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// protected:
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// int year, month, day;
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// };
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#include <bits/stdc++.h>
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using namespace std;
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class Date {
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protected:
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int year, month, day;
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public:
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Date() {
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time_t t = time(nullptr);
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tm *lt = localtime(&t);
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year = lt->tm_year + 1900;
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month = lt->tm_mon + 1;
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day = lt->tm_mday;
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}
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void print() { cout << setfill('0') << setw(2) << month << '-' << setw(2) << day << '-' << setw(4) << year << endl; }
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};
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class ShortE : public Date {
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public:
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ShortE() : Date() {}
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void print() { cout << setfill('0') << setw(2) << day << '-' << setw(2) << month << '-' << setw(4) << year << endl; }
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};
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class MediumDate : public Date {
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public:
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MediumDate() : Date() {}
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void print() {
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string months[12] = { "Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec." };
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cout << months[month - 1] << day << ',' << year << endl;
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}
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};
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class LongDate : public Date {
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public:
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LongDate() : Date() {}
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void print() {
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string months[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
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cout << months[month - 1] << ' ' << day << ", " << year << endl;
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}
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};
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int main() {
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Date d;
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ShortE s;
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MediumDate m;
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LongDate l;
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d.print();
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s.print();
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m.print();
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l.print();
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return 0;
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} |