C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Floating Point          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Bob Smith Guest Posted: Fri Dec 26, 2003 10:01 am    Post subject: Re: Floating Point "geertjoos (AT) pandora (DOT) Be" wrote: Quote: Hi, A pice of code. float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? Thanks in advance. Geert round it /B Back to top geertjoos@pandora.Be Guest Posted: Fri Dec 26, 2003 2:13 pm    Post subject: Floating Point Hi, A pice of code. float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? Thanks in advance. Geert Back to top Geert Joos Guest Posted: Fri Dec 26, 2003 3:25 pm    Post subject: Re: Floating Point "Bob Smith" <bobsmith1 (AT) marketweighton (DOT) com> schreef in bericht news:3FEC06DD.6833C938 (AT) marketweighton (DOT) com... Quote: "geertjoos (AT) pandora (DOT) Be" wrote: Hi, A pice of code. float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? Thanks in advance. Geert round it /B And how do you do that, can you give me an example? I'm just a bit new in C++ Thanks. Geert Quote: Back to top Adam Fineman Guest Posted: Fri Dec 26, 2003 4:02 pm    Post subject: Re: Floating Point Geert Joos wrote: Quote: "Bob Smith" <bobsmith1 (AT) marketweighton (DOT) com> schreef in bericht round it /B And how do you do that, can you give me an example? I'm just a bit new in C++ Here's one way: #include <iostream> #include <cmath> using namespace std; int main() { float A = 10; float B = 7; float result = A / B; float prec = 2.0; float shift_factor = pow(10, prec); cout << round(result * shift_factor) / shift_factor << 'n'; return 0; } Note that the above method is not particularly robust, elagent, or efficient. It's probably not even accurate for arbitrary values of 'result'. Use at your own risk. - Adam -- Reverse domain name to reply. Back to top Alexandros Guest Posted: Fri Dec 26, 2003 5:16 pm    Post subject: Re: Floating Point [email]geertjoos (AT) pandora (DOT) Be[/email] escribió: Quote: Hi, A pice of code. float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? Thanks in advance. Geert If what you want is to display the number with 2 decimals although it actually has more you can do the following: #include <iostream> #include <iomanip> using namespace std; int main() { float a=3.239487; float b=23.234; float r=b/a; cout << setprecision(3) << r << endl; return 0; } Back to top Jeff Schwab Guest Posted: Fri Dec 26, 2003 5:33 pm    Post subject: Re: Floating Point [email]geertjoos (AT) pandora (DOT) Be[/email] wrote: Quote: Hi, A pice of code. float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? Thanks in advance. Geert #include <iostream> /* Truncate a number to (at most) two digits past the decimal point. * NB: This implementation is naive. */ template< typename T > T round2( T const& t ) { return int( t * 100 ) / 100.0; } int main( ) { float A = 10; float B = 7; float result; result = A / B; std::cout << result << 'n'; std::cout << round2( result ) << 'n'; } Back to top Walter Guest Posted: Sat Dec 27, 2003 9:14 am    Post subject: Re: Floating Point "geertjoos (AT) pandora (DOT) Be" <geertjoos (AT) Pandora (DOT) Be> wrote Quote: float A = 10; float B = 7; float result; result = A / B; when i run this program, i've got as result 1,4285714.... etcetc. is it possible to get only two or one decimals after the floating point? And how? float A = 10; float B = 7; float result; result = ((long)((A * 100) / B)) / 100.0; -Walter www.digitalmars.com free C/C++/D compilers 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.