BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  div and mod troubles!          BorlandTalk.com Forum Index -> C++ Builder (Language C++) View previous topic :: View next topic   Author Message Dominique MONTIN Guest Posted: Fri Mar 18, 2005 5:07 pm    Post subject: div and mod troubles! Hi all Why a so simple code does not compile. It generate syntax error ! It seems that the operators div and mod are note recognized by BCB6 ! Is there an options for that ??? { int A,B,q; A = 71; B = 6; q = A div B; // declaration syntax error here !!! // idem with inr r = Amod B; } Thanks Montin Back to top Gillmer J. Derge [TeamB] Guest Posted: Fri Mar 18, 2005 5:19 pm    Post subject: Re: div and mod troubles! Dominique MONTIN wrote: Quote: Why a so simple code does not compile. It generate syntax error ! It seems that the operators div and mod are note recognized by BCB6 ! Correct. They aren't recognized by the C/C++ language either. :-) Quote: Is there an options for that ??? / is div. % is mod. -- Gillmer J. Derge [TeamB] Back to top Chris Uzdavinis (TeamB) Guest Posted: Fri Mar 18, 2005 6:26 pm    Post subject: Re: div and mod troubles! "Dominique MONTIN" <dominique86.jacob (AT) laposte (DOT) fr> writes: Quote: Hi all Why a so simple code does not compile. It generate syntax error ! It seems that the operators div and mod are note recognized by BCB6 ! There are no div and mod operators. Quote: Is there an options for that ??? No, you're thinking of a different language, perhaps? Quote: { int A,B,q; A = 71; B = 6; q = A div B; // declaration syntax error here !!! // idem with inr r = Amod B; } "div" is / (on integral types) "mod" is % (on integral types) -- Chris (TeamB); Back to top Remy Lebeau (TeamB) Guest Posted: Fri Mar 18, 2005 6:27 pm    Post subject: Re: div and mod troubles! "Dominique MONTIN" <dominique86.jacob (AT) laposte (DOT) fr> wrote Quote: Why a so simple code does not compile. Because it is not supposed to. It is not C++ code to begin with. The C++ operators are '/' and '%' for division and modulus, respectively. They are not 'div' and 'mod'. Quote: It seems that the operators div and mod are note recognized by BCB6 ! 'div' and 'mod' are not C++ instructions to begin with. '/' and '%', on the other hand, are. q = A / B; r = A % B; Gambit Back to top Liz Albin Guest Posted: Fri Mar 18, 2005 10:44 pm    Post subject: Re: div and mod troubles! On Fri, 18 Mar 2005 18:07:31 +0100, Dominique MONTIN wrote: Quote: Why a so simple code does not compile. It generate syntax error ! It seems that the operators div and mod are note recognized by BCB6 ! Is there an options for that ??? because div isn't a c++ operator. perhaps you meant q = A/B; and modulus is % -- Good luck, liz Back to top Helmut Giese Guest Posted: Fri Mar 18, 2005 11:07 pm    Post subject: Re: div and mod troubles! Hi, the other postings have already explained what those operators are in C (C++). I take it that you have a Pascal background. If this is true, you will have similar trouble with other operators - Pascal makes them "textual" (like div, mod, xor, etc.) while C makes them, well, let's call it "symbolic". That's not really a big problem, because the compiler will produce an error if you happen to use the Pascal-like form and you can look up the correct way to do it in C. However, there is one thing you _really_ should try to memorize: In Pascal you say if a = b then begin ... In C you would have to say if ( a == b ) { ... BUT here is somewhat of a problem if ( a = b ) { ... (note the '=' instead of '==') is also legal C, however its meaning is totally different from what a Pascal programmer might expect: - it assigns b to a and - evaluates to 'true' if a (and b) are != 0 (<> 0 in Pascal). So this is eventually a big trap for Pascal programmers, because, unlike misused operators like 'div' or 'mod'; it _will_ _compile_ - however, the result will be far off from their expectations. I would recommend PC-Lint (www.gimpel.com) for you: if ever you wonder about some C code which compiles but produces unexpected results, let Lint check it - you'll be a much better C programmer a lot earlier (I've been there). HTH Helmut Giese Back to top Remy Lebeau (TeamB) Guest Posted: Fri Mar 18, 2005 11:17 pm    Post subject: Re: div and mod troubles! "Helmut Giese" <hgiese (AT) ratiosoft (DOT) com> wrote Quote: BUT here is somewhat of a problem if ( a = b ) { ... (note the '=' instead of '==') is also legal C Although legal, the compiler does check to see what the statement is actually doing and will usually flag the statement as a "possibly incorrect assignment" warning. Gambit Back to top Dominique MONTIN Guest Posted: Mon Mar 21, 2005 8:39 am    Post subject: Re: div and mod troubles! Thanks all ! I was "polluted" by my pascal background as helmut guess. Montin "Helmut Giese" <hgiese (AT) ratiosoft (DOT) com> a écrit dans le message de news:423b5b14.26888390 (AT) forums (DOT) borland.com... Quote: Hi, the other postings have already explained what those operators are in C (C++). I take it that you have a Pascal background. If this is true, you will have similar trouble with other operators - Pascal makes them "textual" (like div, mod, xor, etc.) while C makes them, well, let's call it "symbolic". That's not really a big problem, because the compiler will produce an error if you happen to use the Pascal-like form and you can look up the correct way to do it in C. However, there is one thing you _really_ should try to memorize: In Pascal you say if a = b then begin ... In C you would have to say if ( a == b ) { ... BUT here is somewhat of a problem if ( a = b ) { ... (note the '=' instead of '==') is also legal C, however its meaning is totally different from what a Pascal programmer might expect: - it assigns b to a and - evaluates to 'true' if a (and b) are != 0 (<> 0 in Pascal). So this is eventually a big trap for Pascal programmers, because, unlike misused operators like 'div' or 'mod'; it _will_ _compile_ - however, the result will be far off from their expectations. I would recommend PC-Lint (www.gimpel.com) for you: if ever you wonder about some C code which compiles but produces unexpected results, let Lint check it - you'll be a much better C programmer a lot earlier (I've been there). HTH Helmut Giese Back to top Dominique MONTIN Guest Posted: Mon Mar 21, 2005 8:55 am    Post subject: Re: div and mod troubles! A new question. div and mod appears in the list of arithmetic operators in the HELP of BorlandC++ builder 5. It seems strange ? Dominique "Helmut Giese" <hgiese (AT) ratiosoft (DOT) com> a écrit dans le message de news:423b5b14.26888390 (AT) forums (DOT) borland.com... Quote: Hi, the other postings have already explained what those operators are in C (C++). I take it that you have a Pascal background. If this is true, you will have similar trouble with other operators - Pascal makes them "textual" (like div, mod, xor, etc.) while C makes them, well, let's call it "symbolic". That's not really a big problem, because the compiler will produce an error if you happen to use the Pascal-like form and you can look up the correct way to do it in C. However, there is one thing you _really_ should try to memorize: In Pascal you say if a = b then begin ... In C you would have to say if ( a == b ) { ... BUT here is somewhat of a problem if ( a = b ) { ... (note the '=' instead of '==') is also legal C, however its meaning is totally different from what a Pascal programmer might expect: - it assigns b to a and - evaluates to 'true' if a (and b) are != 0 (<> 0 in Pascal). So this is eventually a big trap for Pascal programmers, because, unlike misused operators like 'div' or 'mod'; it _will_ _compile_ - however, the result will be far off from their expectations. I would recommend PC-Lint (www.gimpel.com) for you: if ever you wonder about some C code which compiles but produces unexpected results, let Lint check it - you'll be a much better C programmer a lot earlier (I've been there). HTH Helmut Giese Back to top Alan Bellingham Guest Posted: Mon Mar 21, 2005 9:40 am    Post subject: Re: div and mod troubles! "Dominique MONTIN" <dominique86.jacob (AT) laposte (DOT) fr> wrote: Quote: A new question. div and mod appears in the list of arithmetic operators in the HELP of BorlandC++ builder 5. It seems strange ? Yes. As I recall, those refer to a particular (Formula One?) component, and are terribly, terribly misleading, since the help pages in question don't indicate that. Alan Bellingham -- ACCU Conference 2005 - 20-23 April, Randolph Hotel, Oxford, UK Back to top Andrew Fenton Guest Posted: Mon Mar 21, 2005 2:25 pm    Post subject: Re: div and mod troubles! "Alan Bellingham" <alanb (AT) episys (DOT) com> wrote Quote: "Dominique MONTIN" <dominique86.jacob (AT) laposte (DOT) fr> wrote: Yes. As I recall, those refer to a particular (Formula One?) component, and are terribly, terribly misleading, since the help pages in question don't indicate that. Alan Bellingham -- ACCU Conference 2005 - 20-23 April, Randolph Hotel, Oxford, UK Just a guess, but maybe somebody attempted to adapt help files for Delphi to BCB+ and missed something. I am assuming that Delphi matches Pascal with is arithmetic operators. Andrew Back to top Remy Lebeau (TeamB) Guest Posted: Mon Mar 21, 2005 4:40 pm    Post subject: Re: div and mod troubles! "Dominique MONTIN" <dominique86.jacob (AT) laposte (DOT) fr> wrote Quote: div and mod appears in the list of arithmetic operators in the HELP of BorlandC++ builder 5. I just looked, and they they do NOT appear. Gambit Back to top Alan Bellingham Guest Posted: Mon Mar 21, 2005 4:58 pm    Post subject: Re: div and mod troubles! "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote: Quote: I just looked, and they they do NOT appear. They do on mine - and they appear to be talking about Delphi. (I did an F1 on 'mod') Alan Bellingham -- ACCU Conference 2005 - 20-23 April, Randolph Hotel, Oxford, UK Back to top Bob Gonder Guest Posted: Mon Mar 21, 2005 8:50 pm    Post subject: Re: div and mod troubles! Dominique MONTIN wrote: Quote: A new question. div and mod appears in the list of arithmetic operators in the HELP of BorlandC++ builder 5. It seems strange ? What is the exact topic of the help page? Does it also say "Object Pascal" at the top of the page? Only div and mod I could find were.... #include <stdlib.h> div_t div(int numer, int denom); #include <math.h> double fmod(double x, double y); Functions, not operators. Back to top Rudy Velthuis [TeamB] Guest Posted: Mon Mar 21, 2005 10:23 pm    Post subject: Re: div and mod troubles! Andrew Fenton wrote: Quote: Just a guess, but maybe somebody attempted to adapt help files for Delphi to BCB+ and missed something. I am assuming that Delphi matches Pascal with is arithmetic operators. Andrew, Yes, div and mod are standard Delphi operators. But AFAIK, Alan is right about div and mod and the components. -- Rudy Velthuis [TeamB] http://rvelthuis.bei.t-online.de "It is now possible for a flight attendant to get a pilot pregnant." - Richard J. Ferris, president of United Airlines Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (Language C++) All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  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.