C++ syntax supports reference parameters which allow the following kinds of chan

Question

C++ syntax supports reference parameters which allow the following kinds of changes to the syntax of Problem’s source files. Modify Problem function interfaces to use a reference parameter for date, DATE &, instead of DATE *.

//-------------------------------------------------

void SetDateDD(DATE *date,int DD)

//-------------------------------------------------

{

   date->DD = DD;

}

becomes

//-------------------------------------------------

void SetDateDD(DATE &date,int DD)

//-------------------------------------------------

{

   Date.DD = DD;

}

and the following statement in Problem.cpp

SetDateDD(&date1,30);

becomes

SetDateDD(date1,30);

Code is completed below:

//-------------------------------------------------

// Dr. Art Hanna

// Date.h

//-------------------------------------------------

#ifndef DATE_H

#define DATE_H

struct DATE

{

   int MM;

   int DD;

   int YYYY;

};

void ConstructDate(DATE *date);

void DestructDate(DATE *date);

void InputDate(DATE *date);

void OutputDate(const DATE *date);

void SetDateMM(DATE *date,int MM);

void SetDateDD(DATE *date,int DD);

void SetDateYYYY(DATE *date,int YYYY);

int GetDateMM(const DATE *date);

int GetDateDD(const DATE *date);

int GetDateYYYY(const DATE *date);

#endif

//-------------------------------------------------

// Dr. Art Hanna

// Date.cpp

//-------------------------------------------------

#include <iostream>

#include <iomanip>

#include <cstdlib>

#include ".Date.h"

using namespace std;

//-------------------------------------------------

void ConstructDate(DATE *date)

//-------------------------------------------------

{

   date->DD = 12; date->MM = 1; date->YYYY = 1993;

   cout << "Date construction of "; OutputDate(date); cout << endl;

}

//-------------------------------------------------

void DestructDate(DATE *date)

//-------------------------------------------------

{

   cout << "Date destruction of "; OutputDate(date); cout << endl;

}

//-------------------------------------------------

void InputDate(DATE *date)

//-------------------------------------------------

{

   cout << " MM? "; cin >> date->MM;

   cout << " DD? "; cin >> date->DD;

   cout << "YYYY? "; cin >> date->YYYY;

}

//-------------------------------------------------

void OutputDate(const DATE *date)

//-------------------------------------------------

{

// Use the format MM-DD-YYYY

   cout << setw(2) << date->MM << "-" << setw(2) << date->DD << "-" << setw(4) << date->YYYY;

}

//-------------------------------------------------

void SetDateMM(DATE *date,int MM)

//-------------------------------------------------

{

   date->MM = MM;

}

//-------------------------------------------------

void SetDateDD(DATE *date,int DD)

//-------------------------------------------------

{

   date->DD = DD;

}

//-------------------------------------------------

void SetDateYYYY(DATE *date,int YYYY)

//-------------------------------------------------

{

   date->YYYY = YYYY;

}

//-------------------------------------------------

int GetDateMM(const DATE *date)

//-------------------------------------------------

{

   return( date->MM );

}

//-------------------------------------------------

int GetDateDD(const DATE *date)

//-------------------------------------------------

{

   return( date->DD );

}

//-------------------------------------------------

int GetDateYYYY(const DATE *date)

//-------------------------------------------------

{

   return( date->YYYY );

}

//-------------------------------------------------

// Dr. Art Hanna

// Chapter #3 Problem, Part 1

// Problem.cpp

//-------------------------------------------------

#include <iostream>

#include <iomanip>

#include <cstdlib>

#include ".Date.h"

using namespace std;

//-------------------------------------------------

int main()

//-------------------------------------------------

{

   DATE date1,date2;

   ConstructDate(&date1);

   ConstructDate(&date2);

   SetDateMM(&date1,1);

   SetDateDD(&date1,30);

   SetDateYYYY(&date1,1979);

OutputDate(&date1); cout << endl;

   cout << "date2? " << endl; InputDate(&date2);

// OMG! An example of the violation of the principle of information hiding!!!

   cout << setw(2) << date2.MM << "/"

        << setw(2) << GetDateDD(&date2) << "/"

        << setw(4) << GetDateYYYY(&date2);

   cout << endl;

   DestructDate(&date2);

   DestructDate(&date1);

   system("PAUSE");

   return( 0 );

}

Explanation / Answer

Modified content is as follows:

//-------------------------------------------------
// Dr. Art Hanna
// Date.h
//-------------------------------------------------
#ifndef DATE_H
#define DATE_H

struct DATE
{
   int MM;
   int DD;
   int YYYY;
};

void ConstructDate(DATE &date);
void DestructDate(DATE &date);
void InputDate(DATE &date);
void OutputDate(const DATE &date);
void SetDateMM(DATE &date,int MM);
void SetDateDD(DATE &date,int DD);
void SetDateYYYY(DATE &date,int YYYY);
int GetDateMM(const DATE &date);
int GetDateDD(const DATE &date);
int GetDateYYYY(const DATE &date);

#endif

//-------------------------------------------------
// Dr. Art Hanna
// Date.cpp
//-------------------------------------------------
#include <iostream>
#include <iomanip>
#include <cstdlib>

#include ".Date.h"

using namespace std;

//-------------------------------------------------
void ConstructDate(DATE &date)
//-------------------------------------------------
{
   date.DD = 12; date.MM = 1; date.YYYY = 1993;
   cout << "Date construction of "; OutputDate(date); cout << endl;
}

//-------------------------------------------------
void DestructDate(DATE &date)
//-------------------------------------------------
{
   cout << "Date destruction of "; OutputDate(date); cout << endl;
}

//-------------------------------------------------
void InputDate(DATE &date)
//-------------------------------------------------
{
   cout << " MM? "; cin >> date.MM;
   cout << " DD? "; cin >> date.DD;
   cout << "YYYY? "; cin >> date.YYYY;
}

//-------------------------------------------------
void OutputDate(const DATE &date)
//-------------------------------------------------
{
// Use the format MM-DD-YYYY
   cout << setw(2) << date.MM << "-" << setw(2) << date.DD << "-" << setw(4) << date.YYYY;
}

//-------------------------------------------------
void SetDateMM(DATE &date,int MM)
//-------------------------------------------------
{
   date.MM = MM;
}

//-------------------------------------------------
void SetDateDD(DATE &date,int DD)
//-------------------------------------------------
{
   date.DD = DD;
}

//-------------------------------------------------
void SetDateYYYY(DATE &date,int YYYY)
//-------------------------------------------------
{
   date.YYYY = YYYY;
}

//-------------------------------------------------
int GetDateMM(const DATE &date)
//-------------------------------------------------
{
   return( date.MM );
}

//-------------------------------------------------
int GetDateDD(const DATE &date)
//-------------------------------------------------
{
   return( date.DD );
}

//-------------------------------------------------
int GetDateYYYY(const DATE &date)
//-------------------------------------------------
{
   return( date.YYYY );
}

//-------------------------------------------------
// Dr. Art Hanna
// Chapter #3 Problem, Part 1
// Problem.cpp
//-------------------------------------------------
#include <iostream>
#include <iomanip>
#include <cstdlib>

#include ".Date.h"

using namespace std;

//-------------------------------------------------
int main()
//-------------------------------------------------
{
   DATE date1,date2;

   ConstructDate(date1);
   ConstructDate(date2);
   SetDateMM(date1,1);
   SetDateDD(date1,30);
   SetDateYYYY(date1,1979);
OutputDate(date1); cout << endl;
   cout << "date2? " << endl; InputDate(date2);

// OMG! An example of the violation of the principle of information hiding!!!
   cout << setw(2) << date2.MM << "/"
        << setw(2) << GetDateDD(date2) << "/"
        << setw(4) << GetDateYYYY(date2);
   cout << endl;
   DestructDate(date2);
   DestructDate(date1);

   system("PAUSE");
   return( 0 );
}

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