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        C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1 Powered by phpBB © 2001, 2006 phpBB Group