C++ basics

Date

#pragma once
#include <iostream>
using namespace std;
class Date {
friend ostream &operator<<( ostream &, const Date & );
friend istream &operator>>( istream &, Date & );
public:
Date( int d=0, int m=0, int y=0 ) : day( d ), month( m ), year( y ) { };
void setDate( int d, int m, int y ) { day=d; month=m; year=y; };
private:
int day;
int month;
int year;
};

#include "Date.h"
#include <iostream>
using namespace std;
ostream &operator<<( ostream &out, const Date &d )
{
static const char *monthnames[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
return out << monthnames[ d.month - 1 ] << " " << d.year << ", " << d.day;
}
istream &operator>>( istream &in, Date &d )
{
return in >> d.day >> d.month >> d.year;
}
#if defined( STANDALONE )
int main() {
Date peace( 11, 11, 1918 );
cout << "World War I ended " << peace << ".\n";
peace.setDate( 14, 8 , 1945);
cout << "World War II ended " << peace << ".\n";
Date date;
cout << "Enter today's date (day month year): ";
cin >> date;
cout << "Today is " << date << ".\n";
}
#endif

$ g++ -g -DSTANDALONE Date.cpp -o tdate
$ ./tdate
World War I ended Nov 1918, 11.
World War II ended Aug 1945, 14.
Enter today's date (day month year): 31 12 1999
Today is Dec 1999, 31.

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Date

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