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Comments:
<0> can i use getline() on char * ?
<0> i mean, std::getline()
<1> std::istream::getline() sets the \0 character. So strlen() is what you're supposed to use.
<0> okay
<1> std::istream::getline() also sets the failbit if 0 or n-1 (19 in your case) have been read.
<2> cine ma poate ajuta ? si are rabdare un picut?
<3> hi
<3> how can i fix this error
<3> L'espace de noms ou le type 'Odbc' pour les Imports 'Microsoft.Data.Odbc' est introuvable.
<1> Try again in Engish, CeapaVerde.
<2> :P
<2> but i want some help in PRV
<2> because im to novice :P for the rest
<4> you have to translate it to english first of all :)
<0> so, i can check for that fail bit to check, whether it read more than 19 chars, right?
<0> how do i check?
<2> ...
<0> cin.fail() ?
<1> exactly, DontDo.
<3> 'Odbc' for Imports 'Microsoft.Data.Odbc' is not found
<5> kelly- : thats not a C++ error try #c#
<4> kelly- i guess it's a c# syntax.
<0> cool, so no need for strlen
<1> (so called "managed C++" is not C++)
<1> DontDo: failbit also gets set when nothing was read.
<2> hmm im a begginer.. i don;t know c++ but i want to learn
<2> please tell me the first steps..
<5> CeapaVerde : buy a book
<1> CeapaVerde: get a good book.
<1> calc koenig2
<6> koenig2 = "Accelerated C++: Practical Programming by Example", Andrew Koenig, Barbara Moo, Addison-Wesley, 2000. ISBN 0-201-70353-X.
<2> nooo i don't have money
<1> calc thinkc++
<6> thinkc++ = Free Electronic Book for Download: Thinking in C++, Second Edition, Volume 1& 2 - http://www.mindview.net/Books/TICPP/ThinkingInCPP2e.html
<2> oke
<2> :D
<5> and another option is : http://cplus.about.com/od/beginnerctutorial/l/blcpptutorials.htm
<1> Then get a texteditor and a compiler. Then spend a lot of time with all three of them.
<1> calc compilers
<6> compilers = See the 'Compilers' section at http://www.rafb.net/efnet_cpp/compilers/ for links to free compilers.
<7> Question: How do i check if a string is a number? Do i need to convert from string to int ?
<1> That would be a good idea, Bjprn-. After all, the string could contain a number, but the number could be too large.
<1> If you don't care about the too-large condition then you could check whether it contains only digits.
<1> (check for an optional sign and for the decimal point if applicable)
<7> _m_: how is checking if it's digits done?
<1> By checking whether each character is a digit. <cctype> contains the std::isdigit() function for checking a single character.
<7> hehe, was way easier than i thought...
<7> thansk anyway
<0> is it better to keep all the cl*** declarations in one file say mycl***es.cpp, and include mycl***es.cpp in the other files where we define the member functions for the cl***es
<0> or keep each cl*** declaration, and member function defnitions in individual file. which is better?
<5> you include .h files not .cpp
<0> one complete cl*** in one file seems good. isn't?
<5> one complete calls definition in a .h file is good
<5> put the definitions in one .h file
<0> bealtine, you mean, cl*** declaration + member function defnition. right?
<1> (that's cl*** definitions, not function definitions)
<0> or, do i need to seperate the cl*** declaration and member function defnitions for those cl***
<2> hey thanx verry much
<5> yes
<0> okay
<0> if i have cl*** A{}, objects of which i want to write to myfile.dat. right now i am doing it with ofstream.write(). is there any better way?
<0> it will be easy, if am able to say like ofstream ofile("myfile.dat"); A myobj; ofile<<myobj;
<0> i guess, i need to overload the << operator for my object. right?
<0> can i overload ofstream, the same way like ostream& operator <<(ostream &obj,A aobj){ obj<<aobj; return obj} ?
<8> DontDo you don't need to overload for ofstream
<8> since an ofstream ISA ostream
<0> oh
<0> my cl*** data members are , (sorry, am told not to use strings now )
<0> char cust_id[20];
<0> char cust_name[20];
<0> char cust_address[100];
<0> so the problem is, name and address will be having spaces in it. and while trying to read back from file, its only reading word by word
<0> so, not able to read the way that i wrote in to the file. is there any solution for this?
<0> http://www.rafb.net/paste/results/VB0FvZ68.html , here is the code
<0> do i need to do with ofstream.write() or can i do the same with streams?
<0> i mean, with << and >>
<9> DontDo: are you not using getline() to read from the file ? (***uming the name and address are each on a separate line)
<8> DontDo depends on what you're trying to do
<8> telling us the problem instead of your solution (which isn't working) would be helpful
<0> the problem is to write customer records to a file
<0> and need to read it back, then should be able to modify the record.
<8> is this for school?
<0> not school... its training for a company
<8> and they want you to use array of char rather than std::string?
<0> this is a project asked to do, inorder to be familiar with file handling
<8> and they want you to use array of char rather than std::string?
<0> yes vawjr, that is the most dissapointing
<0> if it was string, things would have very very easy
<8> and apparently they want you to use a binary file instead of text
<0> yeah...., with binary am done
<0> i just thought, whether is it possible to do like this
<0> is there any way to do with text files?
<0> ofcourse, i need to search for a particular record, modify etc.
<8> you'll have to "mark" the ends of your fields and the ends of the records
<8> you need to modify in place?
<0> yeah, i should be able to modify the individual values
<8> this is bull****...nobody is doing that these days, everyone is using database back ends
<0> like, address, name etc
<0> they told to simulate as if like a database. :)
<8> well, among other things, you'll be doing non-standard C++ stuff
<8> btw, you don't need to overload ifstream and istream separately
<0> okay....
<8> .....BUT.... if you're planning on re-writing stuff istream and ostream won't work
<8> you MUST have files
<0> yo mean, binary files?
<0> or else, i need to read sequentially from one file and write to another file, after modification. right?
<8> bingo
<0> :D
<8> for that you could use just streams
<8> do they care if you read and write the entire "record" at a time?
<0> nope
<0> the order of the record should not change...
<8> if you want to use >> and << with binary files I posted a couple years ago a simple cl*** to handle it
<0> if i use string instead of char* in the program that i posted, will it work? ( i mean, will the multiple words for one field problem get solved)
<8> http://noidea128.org/sourcefiles/853.html
<0> let me see...
<8> DontDo no
<0> okay
<8> >> on a char* or std::string (text file) will skip whitespace, read data until whitespace
<0> hmm
<8> so if you want embedded spaces you have a few choices
<8> 1) use binary files
<8> 2) translate all the spaces to somethign else "_" for example
<8> 3) delimit the fields and records (this will likely require NOT updating in place
<0> the most easiest is binary file.. :)
<8> if you use the link I posted you can do customer c; file >> c; and it will work
<0> :)
<0> most of the things, am not able to understand in that cl***. :)
<0> what is reinterpret_cast?
<8> most people have no clue how to teach C++
<0> true...
<0> here what is happening is, they are doing C in C++
<0> nothing more... not even covering Strings, STL etc
<8> yes, many people don't understand C++ at all
<8> they think C++ is C with a couple additions
<0> exactly
<0> i once argued that, they both are totally different, only the syntax is same, and c++ supports C for compatibility
<8> that's how I see it
<0> :)
<8> but "procedure oriented design" weenies think that a cl*** or two makes them OO experts
<0> i would like to think in this way bcoz, that will help me to easily distinguish between C and C++
<10> Zzz
<10> zz
<11> hi, I have a function f() that takes an f(ostream&) as a parameter, I was wondering, when I call that function, how do I p*** cout as the stream
<10> f(cout);
<11> that easy, huh
<11> :)
<11> got it working, thx
<8> well, it's kinda hard to split up the theta
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