BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  FormatFLoat          BorlandTalk.com Forum Index -> C++ Builder (Non-Technical) View previous topic :: View next topic   Author Message Mike Margerum Guest Posted: Mon Mar 14, 2005 5:43 pm    Post subject: FormatFLoat float f=3.24; AnsiString str; str.FormatFloat("$##.00",f); ShowMessage(str); str = FormatFloat("$##.00",f); ShowMessage(str); The first ShowMessage is blank. The 2nd one works. why? Back to top Vladimir Stefanovic Guest Posted: Mon Mar 14, 2005 5:54 pm    Post subject: Re: FormatFLoat Not sure, but you need this: str = str.FormatFloat( "$##.00", f ); -- Best regards, Vladimir Stefanovic "Mike Margerum" <mike (AT) garbage (DOT) com> wrote Quote: float f=3.24; AnsiString str; str.FormatFloat("$##.00",f); ShowMessage(str); str = FormatFloat("$##.00",f); ShowMessage(str); The first ShowMessage is blank. The 2nd one works. why? Back to top Micha Nelissen Guest Posted: Mon Mar 14, 2005 6:48 pm    Post subject: Re: FormatFLoat On Mon, 14 Mar 2005 12:43:11 -0500 Mike Margerum <mike (AT) garbage (DOT) com> wrote: Quote: float f=3.24; AnsiString str; str.FormatFloat("$##.00",f); ShowMessage(str); str = FormatFloat("$##.00",f); ShowMessage(str); The first ShowMessage is blank. The 2nd one works. why? I vaguely recall FormatFloat being a class method of ansistrings. It returns the formatted value. (AnsiString.FormatFloat(...) would be clearer, but that is delphi -> c++ heritage?) Micha Back to top mr_organic Guest Posted: Mon Mar 14, 2005 6:54 pm    Post subject: Re: FormatFLoat "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote in news:4235cfdf (AT) newsgroups (DOT) borland.com: Quote: Not sure, but you need this: str = str.FormatFloat( "$##.00", f ); I think it's because the FormatFloat method of the AnsiString is a static method, not an instance method, and returns a new instance of AnsiString. FormatFloat (the global method) does the same, but is not invoked as a static member. mr_organic Back to top Michael Gillen Guest Posted: Mon Mar 14, 2005 6:59 pm    Post subject: Re: FormatFLoat Mike Margerum wrote: Quote: float f=3.24; AnsiString str; str.FormatFloat("$##.00",f); ShowMessage(str); str = FormatFloat("$##.00",f); ShowMessage(str); The first ShowMessage is blank. The 2nd one works. why? In the first case, you have an emtry string, then told it to format a float. However, you never told it to store it anywhere. It only used the objects ability to format the float. Try ShowMessage(str.FormatFloat("$##.00",f)), or better yet ShowMessage(FormatFloat("$##.00",f)); -- -Michael Gillen Back to top Mike Margerum Guest Posted: Mon Mar 14, 2005 8:16 pm    Post subject: Re: FormatFLoat AHHHH i c. I just assumed it would operate on the object invoking it. lol Thx mr_organic wrote: Quote: "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote in news:4235cfdf (AT) newsgroups (DOT) borland.com: Not sure, but you need this: str = str.FormatFloat( "$##.00", f ); I think it's because the FormatFloat method of the AnsiString is a static method, not an instance method, and returns a new instance of AnsiString. FormatFloat (the global method) does the same, but is not invoked as a static member. mr_organic Back to top Mike Margerum Guest Posted: Tue Mar 15, 2005 3:09 am    Post subject: Re: FormatFLoat The thing that made me assume it wasnt static was because the sprintf method isnt static. Strange. mr_organic wrote: Quote: "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote in news:4235cfdf (AT) newsgroups (DOT) borland.com: Not sure, but you need this: str = str.FormatFloat( "$##.00", f ); I think it's because the FormatFloat method of the AnsiString is a static method, not an instance method, and returns a new instance of AnsiString. FormatFloat (the global method) does the same, but is not invoked as a static member. mr_organic Back to top mr_organic Guest Posted: Wed Mar 16, 2005 1:28 pm    Post subject: Re: FormatFLoat Mike Margerum <mike (AT) garbage (DOT) com> wrote in news:42365202$1 (AT) newsgroups (DOT) borland.com: Quote: The thing that made me assume it wasnt static was because the sprintf method isnt static. Strange. I've noticed that many static methods of classes are aliased as globals: Trim(), IntToStr(), FormatDateTime(), and so on. It might just be a convenience thing, but I'm not sure. For consistency, and to make the conversion clear, I generally use the static method of the class and not the global method, like so: I write AnsiString strFoo = strTemp.Trim().LowerCase(); instead of AnsiString strFoo = Trim(strTemp); strFoo = LowerCase(strFoo); It condenses the code without compromising clarity. mr_organic Back to top Micha Nelissen Guest Posted: Wed Mar 16, 2005 3:14 pm    Post subject: Re: FormatFLoat On 16 Mar 2005 05:28:35 -0800 "mr_organic" <mr_organic (AT) yourmamashouse (DOT) com> wrote: Quote: AnsiString strFoo = Trim(strTemp); strFoo = LowerCase(strFoo); It condenses the code without compromising clarity. Why not: AnsiString strFoo = LowerCase(Trim(strTemp)); ? Micha Back to top mr_organic Guest Posted: Wed Mar 16, 2005 3:29 pm    Post subject: Re: FormatFLoat It condenses the code without compromising clarity. Quote: Why not: AnsiString strFoo = LowerCase(Trim(strTemp)); ? Micha *Shrug*. No reason. Just a style thing, I guess. One's as good as the other. mr_organic Back to top Duane Hebert Guest Posted: Wed Mar 16, 2005 4:04 pm    Post subject: Re: FormatFLoat "mr_organic" <mr_organic (AT) yourmamashouse (DOT) com> wrote Quote: It condenses the code without compromising clarity. Why not: AnsiString strFoo = LowerCase(Trim(strTemp)); ? Micha *Shrug*. No reason. Just a style thing, I guess. One's as good as the other. I would prefer if static functions were called with the namespace/class name to show that they're static. It's probably not a popular opinion but I would prefer: AnsiString strFoo = AnsiString::LowerCase(AnsiString::Trim(strTemp)); This indicates that it's a static function and in the AnsiString namespace. Back to top Tamas Demjen Guest Posted: Fri Mar 18, 2005 10:35 pm    Post subject: Re: FormatFLoat That wouldn't work, LowerCase and Trim are non-static const member functions. You either output = input.Trim(); or output = Trim(input); I agree, there's a little bit of inconsistency between the sprintf and FormatFloat members. Also, AnsiString has a .ToIntDef() member, as well as a ToDouble(), but not a .ToDoubleDef(), which would be convenient sometimes. My biggest problem with string classes is that WideString's data access functions are buggy. Like BSTR __fastcall c_bstr() const { return Data; } should be BSTR __fastcall c_bstr() const { return Data ? Data : L""; } An empty string shouldn't be NULL but "" instead. It can cause a lot of crashes and headache. For example, this doesn't work: WideString wide_string; std::wstring s = wide_string.c_bstr(); // boom! Hope this will be fixed in the new BCB. AnsiString doesn't have this bug. Tom Quote: I would prefer if static functions were called with the namespace/class name to show that they're static. It's probably not a popular opinion but I would prefer: AnsiString strFoo = AnsiString::LowerCase(AnsiString::Trim(strTemp)); This indicates that it's a static function and in the AnsiString namespace. 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