Use Date and Employee class to demonstrate composition. - C++ Class

C++ examples for Class:Class Creation

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Description

Use Date and Employee class to demonstrate composition.

Demo Code

                                                                                                                                                    
class Date /*from w  w w . ja  v  a2 s . c  om*/
{ 
public: 
   static const int monthsPerYear = 12; // number of months in a year 
   Date( int = 1, int = 1, int = 1900 ); // default constructor 
   void print() const; // print date in month/day/year format 
   ~Date(); // provided to confirm destruction order 
private: 
   int month; // 1-12 (January-December) 
   int day; // 1-31 based on month 
   int year; // any year 
                                                                                                                                                    
   // utility function to check if day is proper for month and year 
   int checkDay( int ) const; 
}; // end class Date 
                                                                                                                                                    
#include <iostream> 
#include <stdexcept> 
using namespace std; 
                                                                                                                                                    
Date::Date( int mn, int dy, int yr ) { 
   if ( mn > 0 && mn <= monthsPerYear ) // validate the month 
       month = mn; 
   else 
       throw invalid_argument( "month must be 1-12" ); 
                                                                                                                                                    
   year = yr; // could validate yr 
   day = checkDay( dy ); // validate the day 
                                                                                                                                                    
   // output Date object to show when its constructor is called 
   cout << "Date object constructor for date "; 
   print(); 
   cout << endl; 
}
                                                                                                                                                    
void Date::print() const 
{ 
   cout << month << '/' << day << '/' << year; 
}
                                                                                                                                                    
// output Date object to show when its destructor is called 
Date::~Date() 
{ 
   cout << "Date object destructor for date "; 
   print(); 
   cout << endl; 
}
                                                                                                                                                    
int Date::checkDay( int testDay ) const 
{ 
   static const int daysPerMonth[ monthsPerYear + 1 ] = 
       { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; 
                                                                                                                                                    
   // determine whether testDay is valid for specified month 
   if ( testDay > 0 && testDay <= daysPerMonth[ month ] ) 
       return testDay; 
                                                                                                                                                    
   // February 29 check for leap year 
   if ( month == 2 && testDay == 29 && ( year % 400 == 0 || 
       ( year % 4 == 0 && year % 100 != 0 ) ) ) 
       return testDay; 
                                                                                                                                                    
   throw invalid_argument( "Invalid day for current month and year" ); 
} // end function checkDay 
                                                                                                                                                    
#include <string> 
using namespace std; 
                                                                                                                                                    
class Employee 
{ 
public: 
   Employee( const string &, const string &, 
       const Date &, const Date & ) ; 
   void print() const; 
   ~Employee(); // provided to confirm destruction order 
private: 
   string firstName; // composition: member object 
   string lastName; // composition: member object 
   const Date birthDate; // composition: member object 
    const Date hireDate; // composition: member object 
}; // end class Employee 
                                                                                                                                                    
                                                                                                                                                    
#include <iostream> 
using namespace std; 
                                                                                                                                                    
Employee::Employee( const string &first, const string &last, 
    const Date &dateOfBirth, const Date &dateOfHire ) 
    : firstName( first ), // initialize firstName 
      lastName( last ), // initialize lastName 
      birthDate( dateOfBirth ), // initialize birthDate 
      hireDate( dateOfHire ) // initialize hireDate 
{ 
    cout << "Employee object constructor: " << firstName << ' ' << lastName << endl; 
}
                                                                                                                                                    
void Employee::print() const 
{ 
    cout << lastName << ", " << firstName << "  Hired: "; 
    hireDate.print(); 
    cout << "    Birthday: "; 
    birthDate.print(); 
    cout << endl; 
}
                                                                                                                                                    
                                                                                                                                                    
Employee::~Employee() 
{ 
    cout << "Employee object destructor: " << lastName << ", " << firstName << endl; 
}
                                                                                                                                                    
#include <iostream> 
using namespace std; 
                                                                                                                                                    
 int main() 
 { 
    Date birth( 7, 24, 1949 ); 
    Date hire( 3, 12, 1988 ); 
     Employee manager( "Bob", "Blue", birth, hire ); 
                                                                                                                                                    
    cout << endl; 
    manager.print(); 
 }

Result


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