PROGRAM 38


//  FILE NAME:  PROG38.CPP     PROGRAMMER NAME:  ANTHONY F. ORTIZ
//  THIS PROGRAM USES A TEMPLATE CLASS CALLED ARRYLIST.  THE MEMBER FUNCTIONS
//  OF ARRAYLIST WILL INITIALIZE THE SIZE OF THE ARRAY, ADD A ITEM TO THE
//  ARRAY, SHOW THE SIZE OF THE ARRAY, DISPLAY ALL ARRAY ITEMS, AND CHANGE A
//  ARRAY ITEM.  ARRAY IS OF FLOAT TYPE.

#include "alist2.h"

typedef arraylist  list;

print_menu ();
char get_selection (list & expenses);
pause_program ();

int main ()
{
    char choice;
    list expenses;
    do
    {
        print_menu ();
        choice = get_selection (expenses);
    }
    while (choice != 'Q');
    return 0;
}

print_menu ()
{
    clrscr ();
    gotoxy (25, 1);
    cout << "MENU OPTIONS";
    gotoxy (30, 3);
    cout << "E -- ENTER OBJECT";
    gotoxy (30, 4);
    cout << "T -- PRINT COUNT";
    gotoxy (30, 5);
    cout << "C -- CHANGE OBJECT";
    gotoxy (30, 6);
    cout << "D -- DISPLAY OBJECTS";
    gotoxy (30, 7);
    cout << "Q -- QUIT PROGRAM";
    gotoxy (25, 9);
    cout << "ENTER SELECTION ";
    return 0;
}

char get_selection (list & expenses)
{
    char choice;
    cin >> choice;
    choice = toupper (choice);
    switch (choice)
    {
        case ('E'):  {
                         expenses.enteritem ();
                         break;
                     }
        case ('T'):  {
                         expenses.printtotal ();
                         pause_program ();
                         break;
                     }
        case ('C'):  {
                         expenses.changelist ();
                         pause_program ();
                         break;
                     }
        case ('D'):  {
                         expenses.viewlist ();
                         pause_program ();
                         break;
                     }
        case ('Q'):  {
                         clrscr ();
                         break;
                     }
    }
    return (choice);
}

pause_program ()
{
    cout << endl << "PRESS ENTER KEY TO CONTINUE ..... ";
    getch ();
    return 0;
}

//  FILE NAME:  ALIST2.H
//  THIS FILE CONTAINS THE DECLARATION OF THE CLASS CALLED ARRAYLIST.

#ifndef alist2_h
#define alist2_h

#include 
#include 
#include 
#include 

const int max = 100;

template 
class arraylist
{
    public:
        arraylist ();
        //  POST:  CONSTRUCTOR, INITIALIZES THE PRIVATE MEMBER COUNT TO 0
        //         AND ALLOCATES MEMORY FOR ARRAYLIST CLASS WITH THE NEW
        //         OPERATOR.

        ~arraylist ();
        //  POST:  DESTRUCTOR, DEALLOCATES MEMORY FOR ARRAYLIST CLASS WITH
        //         THE DELETE OPERATOR.

        void initcount (void);
        //  POST:  INITIALIZES THE PRIVATE MEMBER COUNT TO 0.

        void enteritem (void);
        //  POST:  PROMPTS FOR OBJECT TO ENTER INTO THE LIST FROM THE KEYBOARD.

        void printtotal (void);
        //  POST:  PRINTS THE CURRENT COUNT.

        void viewlist (void);
        //  POST:  DISPLAY CURRENT LIST WITH POSITION NUMBERS 1, 2, 3, ..., N WHERE
        //         N EQUALS COUNT + 1.

        void changelist (void);
        //  POST:  THIS FUNCTION IS TO CALL VIEWLIST AUTOMATICALLY WHEN INVOKED.  USER
        //         SHOULD BE ABLE TO 'CANCEL' WITHOUT MAKING ANY CHANGES IF DESIRED.
        //         THERE WILL BE TWO POSSIBLE CHANGES:
        //         (A)  USER MAY ENTER A NEW ITEM TO REPLACE AN EXISTING ITEM AT A
        //              POSITION OF THEIR CHOICE.
        //         (B)  USER MAY DELETE AN ITEM FROM THE LIST, THUS AFFECTING THE
        //              POSITION NUMBERS OF THE REMAINING ITEMS.

    private:
        type * list;
        int count;
};

#include "alist2.cpp"
#endif

//  FILE NAME:  ALIST2.CPP
//  THIS FILE CONTAINS THE IMPLEMENTATION OF THE ARRAYLIST CLASS.

template 
arraylist  :: arraylist ()
{
    list = new type [max];
    count = 0;
    cout.setf (ios :: showpoint);
    cout.setf (ios :: fixed);
    cout << setprecision (2);
}

template 
arraylist  :: ~arraylist ()
{
    delete [] list;
}

template 
void arraylist  :: initcount (void)
{
    count = 0;
}

template 
void arraylist  :: enteritem (void)
{
    clrscr ();
    cout << "ENTER A OBJECT. ";
    cin >> list [count];
    count++;
}

template 
void arraylist  :: printtotal (void)
{
    clrscr ();
    cout << "THE SIZE OF THE ARRAY IS " << count << endl;
}

template 
void arraylist  :: viewlist (void)
{
    clrscr ();
    cout << "HERE ARE ALL THE ITEMS OF THE OBJECT ARRAY: " << endl << endl;
    for (int a = 0; a < count; a++)
    {
        cout << "OBJECT " << (a + 1) << ": " << setw (8) << list [a];
        cout << endl;
    }
}

template 
void arraylist  :: changelist (void)
{
    char choice, ans;
    int position, flag;
    type change;
    clrscr ();
    gotoxy (25, 1);
    cout << "MENU CHOICES";
    gotoxy (30, 3);
    cout << "D -- DELETE AN ITEM";
    gotoxy (30, 4);
    cout << "C -- CHANGE AN ITEM";
    gotoxy (25, 6);
    cout << "ENTER A CHOICE: ";
    cin >> choice;
    choice = toupper (choice);
    if (choice == 'D' || choice == 'C')
    {
        clrscr ();
        do
        {
            cout << "ENTER A # FROM 1 .. " << count;
            cout << " TO CHANGE AN ITEM. ";
            cin >> position;
            cout << endl;
        }
        while (position < 1 || position > count);
    }
    switch (choice)
    {
        case ('D'):  {
                         clrscr ();
                         cout << "DELETE OBJECT " << position << " ";
                         cout << list [position - 1] << " (Y/N)? ";
                         cin >> ans;
                         ans = toupper (ans);
                         if (ans == 'Y')
                         {
                             flag = 0;
                             for (int a = 0; a < count; a++)
                             {
                                 if (a == (position - 1) || flag == 1)
                                 {
                                     list [a] = list [a + 1];
                                     flag = 1;
                                 }
                             }
                             count--;
                             cout << endl << "OBJECT DELETED " << endl;
                         }
                         else
                         {
                             cout << endl << "OBJECT NOT DELETED" << endl;
                         }
                         break;
                     }
        case ('C'):  {
                         clrscr ();
                         cout << "ENTER NEW OBJECT " << position << ": ";
                         cin >> change;
                         cout << endl << "CHANGE OBJECT " << position;
                         cout << " " << list [position - 1] << " (Y/N)? ";
                         cin >> ans;
                         ans = toupper (ans);
                         if (ans == 'Y')
                         {
                             for (int a = 0; a < count; a++)
                             {
                                 if (a == (position - 1))
                                 {
                                     list [a] = change;
                                 }
                             }
                             cout << endl << "OBJECT CHANGED" << endl;
                         }
                         else
                         {
                             cout << endl << "OBJECT NOT CHANGED" << endl;
                         }
                         break;
                     }
    }

}

//  OUTFILE:  PROG38.OUT

MENU OPTIONS

    E -- ENTER OBJECT                                  
    T -- PRINT COUNT                                   
    C -- CHANGE OBJECT                                 
    D -- DISPLAY OBJECTS                               
    Q -- QUIT PROGRAM                                  
                                                                                
ENTER SELECTION q




BACK TO COMP251 PAGE.