C / C++ / MFC

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Adding two IEEE754 double numbers Member 2296013-Mar-03 14:53 Member 22960 13-Mar-03 14:53  Hello, I have an assignment to write a C function to add two IEEE754 double numbers based on an algorithm in my text book. The function adds two positive doubles via two unsigned long parameters and returns the result also in unsigned long format. My professor gave us the main program and an empty subroutine and I need to code the subroutine. All I am trying to do for now is print the values that are entered by the user, not do any calculations, just print them in the main and then once they get into the subroutine and I can't even get that. It's been a year and a half since I have done any c programming, but I did not expect to be stumped this quickly ... Here is the code. I commented the lines that I added, not much. I understand the values I get when I print the HEX, but I get all zeroes when I try to print the decimal values. Thanks for any help. #include <stdio.h> unsigned long adddouble(unsigned long x, unsigned long y) { //I added all unsigned long result; result = x; //print values of x and y printf("In subroutine, x = %f and y = %f\n", x ,y); printf("In subroutine, return = %f\n", result); return result; } int main(int argc, char* argv[]) { double d1, d2; double *dp; unsigned long s; unsigned long *longp1, *longp2; //get two input real numbers scanf("%lf %lf", &d1, &d2); longp1 = (unsigned long*)&d1; longp2 = (unsigned long*)&d2; //I added - hex value of what longp1 and longp2 point to printf("In main longp1 = %08x, %08x \n", *longp1, *(longp1+1)); printf("In main longp2 = %08x, %08x \n", *longp2, *(longp2+1)); //I added - decimal value of what longp1 and longp2 point to printf("In main longp1 = %f \n", *longp1); printf("In main longp2 = %f \n", *longp2); s = adddouble(*longp1, *longp2); dp = (double*)&s; printf("%f + %f = %f\n", d1, d2, *dp); return 0; } PC Charting Impossible... cemlouis13-Mar-03 14:35 cemlouis 13-Mar-03 14:35  Hi, Can somebody advice me a charting software to work with MFC, it can be activex or library... Re: Charting Impossible... Chris Losinger13-Mar-03 14:50 Chris Losinger 13-Mar-03 14:50  ChartFX is pretty good. -c Image tools: ThumbNailer, Bobber, TIFFAssembler Re: Charting Impossible... cemlouis13-Mar-03 15:03 cemlouis 13-Mar-03 15:03  I looked at www.softwarefx.com for ChartFX is this compatible with MFC? Re: Charting Impossible... Chris Losinger13-Mar-03 15:04 Chris Losinger 13-Mar-03 15:04  yes. -c Image tools: ThumbNailer, Bobber, TIFFAssembler programming issues kasturirawat13-Mar-03 11:43 kasturirawat 13-Mar-03 11:43  Check out site for programming issues http://discuss.fogcreek.com/techInterview/default.asp Feel free to spread word fro thsi site Re: programming issues Anonymous13-Mar-03 12:06 Anonymous 13-Mar-03 12:06  WHAT A POS Visual C++ 6.0 or Visual C++.net? K. Shaffer13-Mar-03 10:59 K. Shaffer 13-Mar-03 10:59  Ok, I need to purchase a compiler to develop software that will need to run on Windows 98, 2000, and XP. Problem is is that the computer that I need to compile my code on is Windows 98, and Visual C++.net requires XP, 2000 or NT. This computer has had XP installed on it before and had so many problems that I had to install windows 98 back onto it. Would I be better off purchasing Visual C++ 6.0(there are still a few vendors that sell it) or getting a machine that will actually run XP? Also, why is Visual C++ 6.0 so much more expensive than Visual C++.net? Kevin Shaffer Student of Computer Science University of Kansas kshaff03@msn.com Re: Visual C++ 6.0 or Visual C++.net? Chris Losinger13-Mar-03 11:10 Chris Losinger 13-Mar-03 11:10  kshaff03 wrote: Also, why is Visual C++ 6.0 so much more expensive than Visual C++.net? which flavor of VC6? (developer, enterprise, academic, etc.). some of them contain VB, InterDev and other things. i hear good things about VC7, but personally i can't stand it. MS radically changed the IDE from VC6 to VC7, and for an old timer like me (started with VC 1.5), the new IDE looks and feels like VB Gone Wild. the VC7 C++ compiler does have some improvements over the VC6 C++ compiler, but i've never run into any situation where it mattered - the things VC6 can't do are somewhat esoteric, at least to me. so, to me, VC6 is the only way to go. but, if the price difference is great and you have no previous VC experience, VC7 will probably be fine for you. -c Image tools: ThumbNailer, Bobber, TIFFAssembler Re: Visual C++ 6.0 or Visual C++.net? K. Shaffer13-Mar-03 12:13 K. Shaffer 13-Mar-03 12:13  I was actually looking at Professional, which the cheapest one I could find is at 224.00(brand new anyway). .NET is at 89.00. I also came across an acedemic version of 6.0 that retails for less than 100.00. Is there any reason why I wouldnt be able to use this version? I do plan on distributing this as a product, so I am very hesitant to purchase an academic version, but if it works, why not? All the program has to do is read a .dbf file and send characters through a serial port. I'll also need some GUI stuff too. Kevin Shaffer Student of Computer Science University of Kansas kshaff03@msn.com Re: Visual C++ 6.0 or Visual C++.net? Chris Losinger13-Mar-03 12:25 Chris Losinger 13-Mar-03 12:25  224 is pretty cheap for professional, since it contains VC++, VB, FoxPro, InterDev and VJ++, and a full MSDN library. the $89 VC++ 7, on the other hand, just has VC7 (plus the IDE and maybe some MSDN stuff). the full VS.Net (pro, enterprise, etc) has VC, VB, C#, and all the other junk and costs many hundreds of $s. the academic version should be fine. i think there are legal restrictions on what you can do with it, but no functional restrictions. be sure to check which version it is, tho (enterprise, pro, student, etc.). the student version, i think, has limited functionality. (student != academic) -c Image tools: ThumbNailer, Bobber, TIFFAssembler Re: Visual C++ 6.0 or Visual C++.net? K. Shaffer13-Mar-03 12:29 K. Shaffer 13-Mar-03 12:29  Cool, thanks for your help! Kevin Shaffer Student of Computer Science University of Kansas kshaff03@msn.com Re: Visual C++ 6.0 or Visual C++.net? Nick Parker13-Mar-03 17:38 Nick Parker 13-Mar-03 17:38  Chris Losinger wrote: the new IDE looks and feels like VB Gone Wild. Makes me think we should be expecting the IDE to lift it's top and show the underlying source code. If you have no clue what I am talking about, look at this site (not office safe)[^] and you will see the correlation. -Nick Parker Re: Visual C++ 6.0 or Visual C++.net? Michael Dunn13-Mar-03 11:39 Michael Dunn 13-Mar-03 11:39  kshaff03 wrote: the computer that I need to compile my code on is Windows 98 Well, that makes your decision easy - VC 6. Even if you were running an NT flavor, I'd still say get version 6, the IDE in v7 is awful IMAO. --Mike--    THERE IS NO     THERE IS NO    BUT THERE IS MAGIC PIXIE DUST  BUSINESS GENIE  CODE PROJECT Homepage | RightClick-Encrypt | 1ClickPicGrabber Re: Visual C++ 6.0 or Visual C++.net? Anonymous13-Mar-03 12:14 Anonymous 13-Mar-03 12:14  Don't BUY a compiler! Get a free one. InstallShield of Visual C++ 6.0 versus InstallShield Professional 5.1(or 8.0)! ATC13-Mar-03 9:32 ATC 13-Mar-03 9:32  Hi, We are using Visual C++6.0 (with InstallShield), because we want to build a distribution application that using MS Access through DAO (Dynaset). When we try to use InstallShieldWizard ... we could not see the option DAO/JetEngine template ... as InstallShield 5.1 Professional! My question is: Can we do Visual C++ 6.0 with InstallShield Wizard ... or we must use the InstallShield 5.1 Professional (or 8.0) for our distribution application? I appreciate anyone who knows detail about this issue, Many thanks Returning a file name RalfPeter13-Mar-03 9:20 RalfPeter 13-Mar-03 9:20  How can I check for the existence of a file in a directory? I need to check it before overwriting the file. Thx, Ralf. ralf.riedel@usm.edu Re: Returning a file name Dave Bryant13-Mar-03 9:32 Dave Bryant 13-Mar-03 9:32  Try PathFileExists(), declared in shlwapi.h. You need to link with shlwapi.lib. Dave Re: Returning a file name Chris Losinger13-Mar-03 9:41 Chris Losinger 13-Mar-03 9:41  #include < io.h > if (_access(filename, 0) == 0) { the file exists } -c Image tools: ThumbNailer, Bobber, TIFFAssembler Re: Returning a file name Rob Groves13-Mar-03 10:40 Rob Groves 13-Mar-03 10:40  RalfPeter wrote: How can I check for the existence of a file in a directory? I need to check it before overwriting the file. Thx, Ralf. Windows, C runtime versions already submitted, but if you are addicted to MFC try the following... BOOL FileUtil::FileExists(const CString& strFile) { CFileStatus fs; if (!CFile::GetStatus(strFile, fs)) return FALSE; else return TRUE; } Re: Returning a file name TomKat14-Mar-03 14:47 TomKat 14-Mar-03 14:47  i can`t believe these answers ! check this out : you can use relative or full path ! unsigned long FileSize(const char *fullpath) { _finddata_t data; long handle=0; handle=_findfirst(fullpath,&data); if(handle==-1) return -1; _findclose(handle); if(data.attrib & _A_SUBDIR) { return -1; } return data.size; } BOOL FileExists(const char *fullpath) { _finddata_t data; long handle=0; handle=_findfirst(fullpath,&data); if(handle==-1) return 0; _findclose(handle); if(data.attrib & _A_SUBDIR) { return 0; } return 1; } //be cool I am the mighty keeper of the book on knowledge . Contact me to get your copy . CEdit set it to invisible and visible GWENJi13-Mar-03 9:06 GWENJi 13-Mar-03 9:06  I would simply like to change whether a cedit ctrl is invisible or visibly dynamically. My implementation does not work - I am running Visual Studio 6.0 Here is a snippet: myEditCtrl.ModifyStyle(GetStyle() & ~WS_VISIBLE, WS_CHILD | WS_TABSTOP | WS_GROUP); Please help - Thank you Re: CEdit set it to invisible and visible Chris Losinger13-Mar-03 9:07 Chris Losinger 13-Mar-03 9:07  how about myEditCtrl.ShowWindow(SW_HIDE); and myEditCtrl.ShowWindow(SW_SHOW); ? -c Image tools: ThumbNailer, Bobber, TIFFAssembler Re: CEdit set it to invisible and visible Brian Shifrin13-Mar-03 9:17 Brian Shifrin 13-Mar-03 9:17  ->myEditCtrl.ModifyStyle(GetStyle() & ~WS_VISIBLE, WS_CHILD | WS_TABSTOP | WS_GROUP); Oh my, ModifyStyle(StylesToRemove, StylesToAdd); In other words you are removing all styles but WS_VISIBLE and adding WS_CHILD |WS_TABSTOP | WS_GROUP... Should be: myEditCtrl.ModifyStyle(WS_VISIBLE, NULL); Re: CEdit set it to invisible and visible GWENJi13-Mar-03 9:32 GWENJi 13-Mar-03 9:32  Thank you guys for all of your help! I tried doing: myEditCtrl.ModifyStyle(WS_VISIBLE, NULL); but it does not work. The ctrl is initially set to visible. Anything else you can suggest?

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