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  • Must declare function prototype in C?

    - by Mohit Deshpande
    I am kind of new to C (I have prior Java, C#, and some C++ experience). In C, is it necessary to declare a function prototype or can the code compile without it? Is it good programming practice to do so? Or does it just depend on the compiler? (I am running Ubuntu 9.10 and using the GNU C Compiler, or gcc, under the Code::Blocks IDE)

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  • Why would you use the ternary operator without assigning a value for the "true" condition?

    - by RickNotFred
    In the Android open-source qemu code I ran across this line of code: machine->max_cpus = machine->max_cpus ?: 1; /* Default to UP */ It this just a confusing way of saying: if (machine->max_cpus) { ; //do nothing } else { machine->max_cpus = 1; } If so, wouldn't it be clearer as: if (machine->max_cpus == 0) machine->max_cpus = 1; Interestingly, this compiles and works fine with gcc, but doesn't compile on http://www.comeaucomputing.com/tryitout/ .

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  • Auto-needed classes?

    - by fsdfa
    Suppose I have a class A and a class B. The .h of A, needs the .h of B, and the .h of B needs the .h of A. (need = #include). All .h have the guards: #ifndef _classX_ #define _classX_ ... ... #endif But if I compile the .cpp of A, then when it includes the .h of B, the B class cannot include the .h of A class because the A class has already use the guard. How can i solve this?

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  • scaling axes in Mathematica

    - by lak3rs
    I'm sure this is an incredibly simple question but I've recently started using Mathematica so it's all new to me. How do you scale the y axis? I try the following but it won't compile. Plot[y = {Exp[-(x^2+3x+2)]}, {x, 0, 5}, {y, 0, 1}]

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  • How to link latest stable version of libCURL using vc++2010

    - by Rollie
    On 2 separate machines in completely different environments (work, home) I've been unable to compile libCURL out of the box. Running nmake -f Makefile.vc mode=dll VC=10, I get an unresolved external symbol errors for _IdnToAscii and _IdnToUnicode. I believe the definitions are in Normaliz.lib, which is referenced in LFLAGS, but it either isn't finding it or the version I have doesn't have those functions. But I don't see any option to download this file...anyone have a good solution short of commenting out the 2 lines that use these functions?

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  • how to run g95 executable files in OS X terminal

    - by lollygagger
    I am completely new to this game, so please be gentle ;-) I made an example program in Fortran 90, lets call it 'program.f90'. I compile it: g95 program.f90 It creates an executable called a.out How do I run this? It is supposed to print something to the screen, and get input from me, but I cannot figure out how to!

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  • Why is the PrintDialog not displaying (in 64 bit)?

    - by Bill
    This code, when built in .Net for Any CPU platform and running on a 64-bit machine, simply returns a DialogResult of Cancel without showing the expected dialog box. Dim dlg As New System.Windows.Forms.PrintDialog If dlg.ShowDialog() = Windows.Forms.DialogResult.OK Then '... print the document ' End If However, it works fine when the application is built for the x86 platform, and run on a 64-bit machine. How can you display the dialog with a 64-bit compile?

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  • Creating and Compiling a C++ project on Windows

    - by sc_ray
    I need to work on C++ project on my windows machine. My project will consist of various classes(.h and .cpp) as well as the startup file to start the application. The preliminary design is simple but the application has the potential to gain complexity as time goes by. What I need here is ideas to set up the C++ project compiler/IDE/Makefile etc..etc. as well as some standard tools besides Visual C++ to compile/build/link projects such as these on a Windows OS. Thanks

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  • Creating instance of interface in C#

    - by Max
    I'm working with MS Excel interop in C# and I don't understand how this particular line of code works: var excel = new Microsoft.Office.Interop.Excel.Application(); where Microsoft.Office.Interop.Excel.Application is an INTERFACE defined as: [Guid("000208D5-0000-0000-C000-000000000046")] [CoClass(typeof(ApplicationClass))] public interface Application : _Application, AppEvents_Event { } I'm thinking that some magic happens when the interface is decorated with a CoClass attribute, but still how is it possible that we can create an instance of an interface with a new keyword? Shouldn't it generate a compile time error?

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  • Difference between [object variable] and object.variable in Obj-C?

    - by John Smith
    I was working on a program today and hit this strange bug. I had a UIButton with an action assigned. The action was something like: -(void) someaction:(id) e { if ([e tag]==SOMETAG) { //dostuff } } What confuses me is that when I first wrote it, the if line was if (e.tag==SOMETAG) XCode refused to compile it, saying error: request for member 'tag' in 'e', which is of non-class type 'objc_object*' but I thought the two were equivalent. So under what circumstances are they not the same?

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  • How to use Unicode in C++?

    - by Dox
    Assuming a very simple program that: -ask a name. -store the name in a variable. -display the variable content on the screen. It's so simple that is the first thing that one learns. But my problem is that I don't know how to do the same thing if I enter the name using japanese characters. So, if you know how to do this in C++, please show me an example (that I can compile and test) Thanks.

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  • 'umfpack.h' not found, but it's in /opt/local/include/

    - by user2924321
    I'm trying to compile a program called hiQlab on OSX 10.8 g++ -g -O2 -I`echo /Users/.../Documents/hiQlab/hiqlab-2006-07-20/tools/`/lua/include -I`echo /Users/.../Documents/hiQlab/hiqlab-2006-07-20/tools/`/tolua++/include -c cscmatrix.cc cscmatrix.cc:13:12: fatal error: 'umfpack.h' file not found #include "umfpack.h" but I just installed SuiteSparse through macports which includes umfpack and umfpack.h is in fact present in default directory /opt/local/include/ do I need to add the path or something? Thanks!

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  • How is <tgmath.h> implemented?

    - by sync
    C doesn't have (to the best of my knowledge) overloading or templates, right? So how can a set of type-agnostic functions with the same name exist in plain ol' C? The usual compile-time trickery would involve a whole bunch of macros, wouldn't it?

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