C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  a simple problem about using stl op text files          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Chelong Guest Posted: Mon May 14, 2007 9:11 am    Post subject: a simple problem about using stl op text files hey,the follow is the text file content ========================================apple====pear== one Lily 7 0 0 7 7 two Lily 20 20 6.6666 20 8 one Lily 0 10 2.85 4 0 two Lily 22 22 7.33326 2 5 two jenny 6 0 0 6 6 two jenny 12 0 0 12 12 three jenny 36 36 10.26 36 36 four jenny 30 30 6 30 30 four jenny 41 41 8.2 41 41 ......................................... .......................................and so on! i want to get the result: e.g: Lily one pears: 7+0 apples:7+4 two pears:8 + 5 apples:20 + 2 the jenny the same ,and some others ================================ how can i make it come true using stl?or another simple way? waiting for ur help! thx advance! Back to top Hari Guest Posted: Mon May 14, 2007 9:11 am    Post subject: Re: a simple problem about using stl op text files Chelong je napisao: Quote: hey,the follow is the text file content ========================================apple====pear== one Lily 7 0 0 7 7 two Lily 20 20 6.6666 20 8 one Lily 0 10 2.85 4 0 two Lily 22 22 7.33326 2 5 two jenny 6 0 0 6 6 two jenny 12 0 0 12 12 three jenny 36 36 10.26 36 36 four jenny 30 30 6 30 30 four jenny 41 41 8.2 41 41 ........................................ ......................................and so on! i want to get the result: e.g: Lily one pears: 7+0 apples:7+4 two pears:8 + 5 apples:20 + 2 the jenny the same ,and some others ================================ how can i make it come true using stl?or another simple way? waiting for ur help! thx advance! 1. use std::fstream for reading 2. use std::vector (std::list, or other container) to store result 3. display content using std::cout Note: nobady will do your homework here. Please post specific question. Best, zaharije Pasalic Back to top Zeppe Guest Posted: Mon May 14, 2007 9:11 am    Post subject: Re: a simple problem about using stl op text files Chelong wrote: Quote: hey,the follow is the text file content [SNIP] waiting for ur help! Hey! If the problem is simple as you state in the topic, why don't you solve it by yourself? The solution is here, anyway: http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.2 Feel free to try by yourself and if you have some problem post it here. Regards, Zeppe Back to top Zeppe Guest Posted: Tue May 15, 2007 9:10 am    Post subject: Re: a simple problem about using stl op text files Chelong wrote: Quote: On 5ÔÂ14ÈÕ, ÏÂÎç4ʱ30·Ö, Zeppe zeppe@.remove.all.this.long.comment.email.it> wrote: Chelong wrote: hey,the follow is the text file content [SNIP] waiting for ur help! Hey! If the problem is simple as you state in the topic, why don't you solve it by yourself? The solution is here, anyway:http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.2 Feel free to try by yourself and if you have some problem post it here. Regards, Zeppe ===================================================== thx for ur reminding! actually,i had solved the problem by myself,and it is not a homework. but i want a more simple method to modify it using stl.just so! Sorry for insinuating, then Just custom. As Hari suggested, you can read the file with an std::fstream. Actually, everything depend on how many particular bad-format cases do you want to handle, but if you want to retain it simple I suggest you to use an exception-based approach. Apart for the first line, that I would read with a separate approach (basically removing the '=' symbols and retaining the string to identify the categories), for the rest of the file (the data rows, I would use a row-based approach. Basically, I would declare a fstream and take the single lines with the getline() method. Then, you can declare a std::istringstream (that is, a stream based on a string instead that on a file) and then you tell it to throw exceptions whenever an unexpected input is read. basically: cin.exceptions( std::ios_base::badbit | std::ios_base::failbit ); Then, you can at least parse the single line without checking if every input has been read correctly. Then you can put everything in a data structure, but I haven't understood very well the format of the data, so I can't give you more suggestions on this point. Regrads, Zeppe Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.