C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  reading numeric value to char          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Mikael Gustavsson Guest Posted: Sat Feb 21, 2004 11:00 am    Post subject: reading numeric value to char I use characters to store numerical values and I'm reading from a file that looks like this: 0 2 40 -2 .. ifstream from("file"); for(int i=0; i<lines in file; ++i) { from >> data[i].a >> data[i].b Quote: data[i].c >> data[i].d; } a, b, c and d are characters used to store numerical values. I want to read 2 as 2 not ascii '2', and i want 40 as 40, not '4' and '0'. Yes, I can read into a temporary int, and cast. But is there a nicer way? -- Mikael Gustavsson [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Jack Klein Guest Posted: Sun Feb 22, 2004 10:59 am    Post subject: Re: reading numeric value to char On 21 Feb 2004 06:00:08 -0500, [email]migu02 (AT) fnatte (DOT) nada.kth.se[/email] (Mikael Gustavsson) wrote in comp.lang.c++.moderated: Quote: I use characters to store numerical values and Why? Unless you have an extremely large number of them, it makes much more sense to use ints. Quote: I'm reading from a file that looks like this: 0 2 40 -2 .. Are you using signed char or just plain char? On some implementations plain char will be signed. Quote: ifstream from("file"); for(int i=0; i<lines in file; ++i) { from >> data[i].a >> data[i].b data[i].c >> data[i].d; } a, b, c and d are characters used to store numerical values. I want to read 2 as 2 not ascii '2', and i want 40 as 40, not '4' and '0'. Yes, I can read into a temporary int, and cast. But is there a nicer way? You haven't explained what the data in the file looks like. If you created the file and put binary data in it, you should be able to read binary data back. If the file contains numbers in text, somewhere along the line you need to do the conversion, and in that case reading into an int is probably the best solution. But you do not need a cast to assign an int to a char. The conversion is automatic. If the value of the int is outside the range of values representable in the char, and the char is signed, the results are no different with or without the cast. -- Jack Klein Home: http://JK-Technology.Com FAQs for comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html comp.lang.c++ http://www.parashift.com/c++-faq-lite/ alt.comp.lang.learn.c-c++ http://www.contrib.andrew.cmu.edu/~ajo/docs/FAQ-acllc.html [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] 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 (Moderated) 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.