[prog] Re: C++
Sue Stones
suzo at spin.net.au
Sun Mar 14 16:38:50 EST 2004
On Sun, 14 Mar 2004 12:43 am, wolf wrote:
> would anyone happen to be able to figure out how to complete/fix this
> and get it to work? : )
> I've been up most of the night and I just can't seem to get a grasp of
> how. or do I have
> everything so out of order and messed up it's beyond hope? thanks : )
What is the output when you try and compile it? If you send that to the list
we can say what you need to look at, ie help you understand what it means.
Did you check the syntax against your text book, what are you using by the
way? I mentioned that it was likely to be wrong. In particular you should
check the way of accessing methods of objects, it is likely to be "->" rather
than "."
What things have you tried to do. Whilst I am happy to help I certainly don't
have time to do it for you. And you certainly won't learn anything that way,
and learning programming is as the process more than the outcome, so I need
you to explain what you have tried then I can explain what you are doing
wrong, orwhat you haven't thought of etc.
sue
> #include <iostream>
> using namespace std;
>
> class cd {
> private:
> char artist[30];
> char title[50];
> int yr;
> char genre[10];
>
> public:
> cd(); // construct a new blank CD.
> void getdata(void);
> //void showdata(void); // probably show data and put data are
> the same thing
> // I sugest that you get rid of this.
> void putdata(void);
> };
>
>
> //***********************
>
> class cdlib {
> int main()
> {
> cd rack[10]; // some place to keep 10 CDs
>
> for(int i=0; i<10; i++)
> {
> rack[i] = new cd(); // create a new CD
> rack[i].getdata(); // fill it with data
> rack[i].putdata(); // print out the data to confirm its
> right.
> } // for
> for(int i=0; i<10; i++)
> {
> rack[i].putdata(); // print out the data to confirm its right.
> } // for
> return 0;
> } // main
>
> };
> //********
>
> void getdata()
> {
> /* get the data from the user and write it down to a text file. use
> cin */
> cout << "Enter the Artist's Name: "<< endl;
> cin.getline >> artist;
> cout << "Enter the Compact Disk Title: " << endl;
> cin.getline >> title;
> cout << "Enter the Year the CD was recorded: "<< endl;
> cin >> yr;
> cout << "Enter the genre for this CD: " << endl;
> cin.getline >> genre;
> }
>
> void putdata()
> {
> cout << artist << endl;
> cout << title << endl;
> cout << yr << endl;
> cout << genre << endl;
> }
>
> > On Mar 13, 2004, at 1:28 AM, Warren Prasad wrote:
> > > No void means that they return nothing ... not even NULL
> > > so the void returning func ends like
> > >
> > > getdata()
> > > {
> > > // body
> > > return ;
> > > }
> > > For showdata you can use the global pointer fp to access the file
> > > which u opened in the main function.
> > >
> > > use fread to read data from the file .... and run a loop for it with
> > > the exit co! ndition being the EOF...
> > >
> > > If u want i can write the whole program for u..
> > >
> > >
> > > regards,
> > >
> > >
> > > wolf wrote:
> > > Hello : )
> > > Thank you for helping : )
> > > Since getdata() and putdata() are of type void would the correct
> > > response
> > > between the braces be:
> > >
> > > getdata()
> > > {
> > > return getdata;
> > > }
> > >
> > > I'm afraid I don't understand this bit at all:
> > > > showdata()
> > > > {
> > > > // use loop with EOF
> > > > // to extract data and display it
> > > > }
> > >
> > > how to extract something from type void?
> > > again thank you for helping : )
> > >
> > > On Mar 13, 2004, at 12:40 AM, Warren Prasad wrote:
> > > > #include
> > > > //not needed
> > > > //using namespace std;
> > > > FILE *fp;
> > > > class cdlib
> > > > {
> > > > char artist[30];
> > > > char title[50];
> > > > int yr;
> > > > char genre[10];
> > > > public:
> > > > void getdata();
> > > > void showdata();
> > > > void putdata();
> > > > };
> > > > int main()
> > > > {
> > > > char ch;
> > > > fp = fopen("library.txt", "+rw");
> > > > ch = 'y';
> > > > while(ch == 'y')
> > > > {
> > > > getdata();
> > > > cout << "do you want to enter more data (y/n) : ";
> > > > cin >> ch;
> > > > }
> > > >
> > > > cout << "do you want to view the data (y/n) : ";
> > > > cin >> ch;
> > > > if (ch == 'y')
> > > > {
> > > > showdata();
> > > > }
> > > > return 0;
> > > > }
> > > > void getdata()
> > > > {
> > > > // Input each data
> > > > // donot use loop
> > > > putdata()
> > > > // use this to write the data into a file
> > > > }
> > > > showdata()
> > > > {
> > > > // use loop with EOF
> > > > // to extract data and display it
> > > > }
> > > >
> > > > !
> > > >
> > > >
> > > >
> > > > wolf wrote:
> > > > Hi : )
> > > >
> > > > Pretty much the whole thing, I think I bit off more than I can chew
> > > >
> > > : )
> > > >
> > > > Last time I posted my
> > > > question someone was nice enough to start the class for me, and
> >
> > I've
> >
> > > > been trying for
> > > > about a week to figure out/follow along how classes work but this
> >
> > is
> >
> > > a
> > >
> > > > pretty big jump
> > > > from what I've tried before. Any advice, ideas, help is very much
> >
> > ! > > appreciated : ) I
> >
> > > > had finally figured out functions but this seems to be a whole new
> > >
> > > game
> > >
> > > > : )
> > > >
> > > > Thank you!
> > > >
> > > > On Mar 12, 2004, at 10:07 PM, Sue Stones wrote:
> > > > > On Sat, 13 Mar 2004 01:24 pm, wolf wrote:
> > > > >> Could anyone help me along with getting this to work? Here's the
> > > > >> original question I'm trying
> > > > >
> > > > > G'day Wolf,
> > > > > Can you be specific about what you are stuck on at the moment?!
> > > > > sue
> > > > >
> > > > >> to figure out:
> > > > >>> w! rite a simple program to track an individual's cd library,
> >
> > the
> >
> > > > >>> program should permit the user to enter 10 cds. Each cd
> > > > >>> should contain the following items: artist, album title, year
> >
> > and
> >
> > > > >>> genre. the program s! hould display all the cds in order
> > > > >>> by artist. design a class and represent each album as an object
> > >
> > > of
> > >
> > > > >>> that class. provide the capability to store the data
> > > > >>> in a text file and retrieve it again the next time the program
> >
> > is
> >
> > > > >>> run.
> > > > >>
> > > > >> #include
> > > > >> using namespace std;
> > > > >>
> > > > >> class cdlib
> > > > >>
> > > > >> {
> > > > >>
> > > > >> char artist[30];
> > > > >>
> > > > >> char title[50];
> > > > >>
> > > > >> int yr;
> > > > >>
> > > > >> char genre[10];
> > > > >>
> > > > >>
> > > > >>
> > > > >> public:
> > > > >>
> > > > >> void getdata();
> > > > >>
> > > > >> void showdata();
> > >
> > >! > >>
> > >
> > > > >&g! t; void putdata();
> > > > >
> > > > >> };
> > > > >>
> > > > >> int main()
> > > > >> {
> > > > >>
> > > > >> int cd;
> > > > >>
> > > > >> /* get the data from the user and write it down to a text file.
> > >
> > > use
> > >
> > > > >> cin */
> > > > >> while (cd < 10)
> > > > >> {
> > > > >> cout << "Enter the Artist's Name: "<< endl;
> > > > >> cin >> artist;
> > > > >> cout << "Enter the Compact Disk Title: " << endl;
> > > > >> cin >> title;
> > > > >> cout << "Enter the Year the CD was recorded: "<< endl;
> > > > >> cin >> yr;
> > > > >> cout << "Enter the ge! nre for this CD: " << endl;
> > > > >> cin >> genre;
> > > > >> }
> > > > >>
> > > > >> return 0;
> > > > >> }
> > > > >> /* to put data into the file fopen, fwrite */
> > > > >>
> > > > >> putdata()
> > > > >>
> > > > >>
> > > > >> }
> > > > >>
> > > > >>
> > > > >>
> > > > >> getdata()
> > > > >>
> > > > >> {
> > > >
> > > > &g! t;> /* Read the data from the file fopen. fread */
> > > >
> > > > >> return data;
> > > > >> }
> > > > >>
> > > > >> _______________________________________________
> > > > >> Programming mailing list
> > > > >> Programming at linuxchix.org
> > > > >> http://mailman.linuxchix.org/mailman/listinfo/programming
> > > > >
> > > > > _______________________________________________
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> > >
> > > Warren Bhusan Prasad.
> > > (Software Enggineer)
> > > Implementation and Support Team,
> > > Jatayu Softwares,
> > > Yehelanka, Bangalore.
> > >
> > > Phone (mobile) : +91 984 513 1255
> > >
> > > Do you Yahoo!?
> > > Yahoo! Mail - More reliable, more storage, less spam
> >
> > Warren Bhusan Prasad.
> > (Software Enggineer)
> > Implementation and Support Team,
> > Jatayu Softwares,
> > Yehelanka, Bangalore.
> >
> > Phone (mobile) : +91 984 513 1255
> >
> > Do you Yahoo!?
> > Yahoo! Mail - More reliable, more storage, less spam
>
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