NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part2/13359

Text File | 1996-08-05 | 6.8 KB | 252 lines

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From: Jonathan Ord <[e-mail]>
Newsgroups: comp.lang.c++
Subject: HELP PLEASE HELP
Date: Sun, 24 Mar 1996 20:49:31 -0800
Organization: Internet Technology Systems, Provo UT USA
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I am just starting out and having some trouble.  I am trying to learn
this out of a book.  I have started by trying to complete an assignment
using linked lists and functions.  I continue to get errors and can't
figure out how to delete a record from a specified record in the lists
that I create.

This is the criteria for the excercise.

Your program must display the following menu:
1.      Add a stamp to the list
2.      Display all the stamps in your list
3.      Display the least expensive stamp in the list
4.      Display the most expensive stamp in the list
5.      Remove a particular stamp from the list
6.      Exit the program

After displaying the menu, ask the user to enter a choice, then perform
the requested action and repeat this process until the user chooses to
exit.
Design an appropriate sturcture to capture 3 properties of stamp
collection.  Store the stamps in a linked list. (using C++ new and
delete operators to allocate and deallocate storage for the stamp
structures.
Be sure that all of the structures work whether the list is empty or
not.  Redisplay the menu if a choice is not valid.
For item 5, I have to devise a way for the user to indicate which stamp
is to be deleted.  Two possibilities include asking the user for a
description of the stam to delete or showing the user each stamp and
asking him or her to say whether this is the one to delete.

Anyone that can help me please feel free to look at my program and make
changes and comments and e-mail it back to me @[e-mail] .

I would like to receive some feedback tonight if possible.  Thank you in
advance for the help.
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/*    Jonathan Ord
    ISYS 440 Exam #2
    Dr. Little
    March 23, 1996
    Description ==The program will let me keep track of rare stamps through the
    use of the functions associated with the following menu:
        1.  Add stamp to list
        2.     Display all the stamps in the list
        3.     Display the least expensive stamp in the list
        4.  Display the most expensive stamp in the list
        5.  Remove a particular stamp from the list
        6.     Exit the program
*/
//------------------------------------------------------------------------------
//INCLUDES

#include <iostream.h>
#include <string.h>

//------------------------------------------------------------------------------
//VARIABLES

struct STAMP {
    char    *name;
    long    price;
    int    mint_number;
    STAMP    *next;
};

const int MAX_STRING_LEN = 128;

//==============================================================================
//FUNCTIONS
//------------------------------------------------------------------------------
//Enter stamp data function

void
Enter_Stamp_Data(STAMP *stp)
{
    char    temp_string[MAX_STRING_LEN];

    cout    <<    "ENTER THE STAMP NAME: ";
    cin.get(temp_string, MAX_STRING_LEN);
    stp->name = new char [strlen(temp_string) + 1];
    strcpy(stp->name, temp_string);
    cout    << "ENTER THE STAMP'S PRICE IN PESETAS: ";
    cin    >>    stp->price;
    cout  << "ENTER THE STAMP'S MINT NUMBER: ";
    cin    >>    stp->mint_number;
}

//------------------------------------------------------------------------------
//Append stamp to end of linked list or end of previous node function

void
Append_Stamp_Node(STAMP * &first, STAMP *stp_ptr)
{
    if    (first == NULL)
        first = stp_ptr;
    else {
        STAMP    *current = first;

        while (current->next != NULL)
            current = current->next;
        current->next = stp_ptr;
        }
}

//------------------------------------------------------------------------------
//Display all of the stamps in the list function

void
Display_Stamp_Data(STAMP * &head, STAMP *stp_ptr)
{
for (stp_ptr = head; stp_ptr != NULL; stp_ptr = stp_ptr->next)
    cout << stp_ptr->name << endl;
    cout << stp_ptr->price << endl;
    cout << stp_ptr->mint_number << endl;
    cout << endl;
}

//------------------------------------------------------------------------------
//Find most expensive stamp in list function

void
Find_Highest_Stamp(STAMP * &head, STAMP *stp_ptr)
{
long     highest_price = 0;
char  name;

for (stp_ptr = head; stp_ptr != NULL; stp_ptr = stp_ptr->next) {
    if    (stp_ptr->price > highest_price) {
        highest_price = stp_ptr->price;
        name = stp_ptr->name;
        }
    }
cout    << "THE MOST EXPENSIVE STAMP IN THE LIST IS: " << name    <<    endl;
cout    << "THE COST OF " <<    name <<    "IS "    <<    highest_price    <<    endl;
}
//------------------------------------------------------------------------------
//Find least expensive stamp in list function

void
Find_Lowest_Stamp(STAMP * &head, STAMP *stp_ptr)
{
long     lowest_price = 2,147,483,647;
char  name;

for (stp_ptr = head; stp_ptr != NULL; stp_ptr = stp_ptr->next) {
    if    (stp_ptr->price < lowest_price) {
        lowest_price = stp_ptr->price;
        name = stp_ptr->name;
        }
    }
cout    << "THE LEAST EXPENSIVE STAMP IN THE LIST IS: " << name    <<    endl;
cout    << "THE COST OF " <<    name <<    "IS "    <<    lowest_price    <<    endl;
}
//------------------------------------------------------------------------------
//Delete a choosen record from the list function

void
Delete_Stamp_Data(STAMP * &head, STAMP *stp_ptr)
{
int answer;

for (stp_ptr = head; stp_ptr != NULL; stp_ptr = stp_ptr->next)
    cout << stp_ptr->name << endl;
    cout << stp_ptr->price << endl;
    cout << stp_ptr->mint_number << endl;
    cout << endl;
    cout << "DO YOU WANT TO DELETE THIS RECORD? (Y FOR YES, N FOR NO) " << endl;
    cin  >> answer >> endl;
        if (answer == 'y') {
                     }}

//==============================================================================
//Main Program - references above functions to accomplish stamp assignment

void
main()
{
STAMP    *head = NULL,
        *stp_ptr;
int    answer;

cout     <<    "CHOOSE ONE (1-6) OF THE FOLLOWING MENU OPTIONS:"    <<    endl;
cout  <<    "1    --    ADD A NEW STAMP RECORD"    <<    endl;
cout    <<    "2    --    DISPLAY ALL THE STAMPS IN THE LIST"    <<    endl;
cout    <<    "3    --    DISPLAY THE MOST EXPENSIVE STAMP IN THE LIST"  << endl;
cout  << "4 -- DISPLAY THE LEAST EXPENSIVE STAMP IN THE LIST"  << endl;
cout    <<    "5 -- REMOVE A STAMP FROM THE LIST"    <<    endl;
cout    << "6    --    EXIT THIS PROGRAM"    << endl;

cin    >>    answer    >>    endl;

switch(answer)
{
case 1:
    stp_ptr = new STAMP;
    stp_ptr->next = NULL;
    Enter_Stamp_Data(stp_ptr);
    Append_Stamp_Node(head, stp_ptr;
    break;
case 2:

    break;
case 3:

    break;
case 4:

    break;
case 5:

    break;
case 6:

    break;






}

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