homework question

cppnoob · 2003-03-03T10:08:20

My assignment is to create a program that asks the user for a list of book titles (using arrays of 10 char) and display the list back to the user. I must first ask how many books to input. Here's an example: How many books? 20 Book Title? MyBook Book Title? YourBook Book Title? Some Other Guy's Book ....... you get the idea.... The output will be Titles ============================== MyBook YourBook Some Othe ................. The problem is I am not allowed to use anything but loops and maybe functions. I can't think of a way to resolve this without using dynamic memory or file I/O. A hint will be greatly appreciated! [edited by - cppnoob on March 2, 2003 10:43:22 PM]

For Beginners

Started by cppnoob March 02, 2003 09:41 PM

12 comments, last by cppnoob 21 years, 1 month ago

Rick Scott

133

March 03, 2003 09:20 AM

If its a beginning C++ class, your teacher would probably accept you making a sufficiently huge array of book titles (1000?) and testing for that limit upon the user's input. I.e.

How Many Books? 12345
ERROR: Maximum number of books is 1000. Try again.
How Many Books? 1001
ERROR: Maximum number of books is 1000. Try again.
How Many Books? 999
Book Title?

If not that, is a vector allowed? Times like this really make you appreciate the STL. A lot.

std::vector < std::string > titles;

With this you can put in as many characters per title and as many titles as you want, given enough memory on your computer

500
edit: HTML versus templates: Round 1001

[edited by - Rick Scott on March 3, 2003 10:21:58 AM]

koolboarder007

122

March 03, 2003 09:51 AM

Really, the best way to do this is by using a pointer. Figure out how many books you need from the user and set it to a pointer. Then you can create an array of that many books and loop. I don''t know if your professor will let you do that though. But if you are allowed to use array''s logic would constitute that you should be allowed to use pointers as well...

koolboarder007

Pipo DeClown

804

March 03, 2003 10:01 AM

quote:Original post by Fruny
Original post by cppnoob
pimple, isn''t this dynamic memory?
char BookTitle[noBooks]; // creates array with number of Books - noBooks

smart_idiot

1,298

March 03, 2003 10:07 AM

I just had another thought:

    char var_on_stack;char *array = &var_on_stack+256;int words;cin >> words;while(--words) cin >> array+word*10;

Of course this is making alot of assumptions and isn't very safe, but you wouldn't need to use new and delete for dynamic memory allocation

. Anyone know how much stack istream::operator >> uses?

Again, if you do that, you will probably fail.

[edited by - smart_idiot on March 3, 2003 11:08:20 AM]

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