#include <iostream>
#include <cstdlib>
using namespace std;
class DayOfYear
{
public:
void input( );
void output( );
void set(int newMonth, int newDay);
//Precondition: newMonth and newDay form a possible date.
void set(int newMonth);
//Precondition: 1 <= newMonth <= 12
//Postcondition: The date is set to the first day of the given month.
int getMonthNumber( ); //Returns 1 for January, 2 for February, etc.
int getDay( );
private:
int month;
int day;
};
int main( )
{
DayOfYear today, bachBirthday;
cout << "Enter today's date:\n";
today.input( );
cout << "Today's date is ";
today.output( );
cout << endl;
bachBirthday.set(3, 21);
cout << "J. S. Bach's birthday is ";
bachBirthday.output( );
cout << endl;
if ( today.getMonthNumber( ) == bachBirthday.getMonthNumber( ) &&
today.getDay( ) == bachBirthday.getDay( ) )
cout << "Happy Birthday Johann Sebastian!\n";
else
cout << "Happy Unbirthday Johann Sebastian!\n";
return 0;
}
void DayOfYear::set(int newMonth, int newDay)
{
if ((newMonth >= 1) && (newMonth <= 12))
month = newMonth;
else
{
cout << "Illegal month value! Program aborted.\n";
exit(1);
}
if ((newDay >= 1) && (newDay <= 31))
day = newDay;
else
{
cout << "Illegal day value! Program aborted.\n";
exit(1);
}
}
//Uses iostream and cstdlib:
void DayOfYear::set(int newMonth)
{
if ((newMonth >= 1) && (newMonth <= 12))
month = newMonth;
else
{
cout << "Illegal month value! Program aborted.\n";
exit(1);
}
day = 1;
}
int DayOfYear::getMonthNumber( )
{
return month;
}
int DayOfYear::getDay( )
{
return day;
}
//Uses iostream and cstdlib:
void DayOfYear::input( )
{
cout << "Enter the month as a number: ";
cin >> month;
cout << "Enter the day of the month: ";
cin >> day;
if ((month < 1) || (month > 12) || (day < 1) || (day > 31))
{
cout << "Illegal date! Program aborted.\n";
exit(1);
}
}
void DayOfYear::output( )
{
switch (month)
{
case 1:
cout << "January "; break;
case 2:
cout << "February "; break;
case 3:
cout << "March "; break;
case 4:
cout << "April "; break;
case 5:
cout << "May "; break;
case 6:
cout << "June "; break;
case 7:
cout << "July "; break;
case 8:
cout << "August "; break;
case 9:
cout << "September "; break;
case 10:
cout << "October "; break;
case 11:
cout << "November "; break;
case 12:
cout << "December "; break;
default:
cout << "Error in DayOfYear::output. Contact software vendor.";
}
cout << day;
}