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• Importing images using subfloats in LaTeX

  - by melisma

  I am using subfloats to import 2 .png files in a figure to basically generate subfigures. There's no space between the figures when I compile it. How do I put some white space in between them? And is it possible to convert them to black and white using LaTeX?

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• [boost::filesystem] performance: is it better to read all files once, or use b::fs functions over an

  - by rubenvb

  I'm conflicted between a "read once, use memory+pointers to files" and a "read when necessary" approach. The latter is of course much easier (no additional classes needed to store the whole dir structure), but IMO it is slower? A little clarification: I'm writing a simple build system, that read a project file, checks if all files are present, and runs some compile steps. The file tree is static, so the first option doesn't need to be very dynamic and only needs to be built once every time the program is run. Thanks

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• error in c, but not in c++

  - by eswar

  const int t=5; char buf[t+5]; When I compile this gives error in C but not in C++!! Can anybody please explain me the reason? Note: I know the const defaults to internal linkage in 'C++', where as in 'C' it defaults to external linkage. Does it has any relation to the above case??

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• how to write hello world in assembler under windows?

  - by feiroox

  Hi I wanted to write something basic in assembly under windows, I'm using nasm, but I can't get anything working. How to write and compile hello world without help of c functions on windows? thx

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• In java, is there any disadvantage to static methods on a class?

  - by Michael Campbell

  Lets assume that a rule (or rule of thumb, anyway), has been imposed in my coding environment that any method on a class that doesn't use, modify, or otherwise need any instance variables to do its work, be made static. Is there any inherent compile time, runtime, or any other disadvantage to doing this?

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• Multiple declarations and definations

  - by Yogesh

  X.c >> ------------------------- int i; main () { fun (); } ------------------------- Y.c >> int i; fun () { } why does these two files compile with no error ? (using GCC) but if i use int i = 10; throws multiple definition error

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• how do i avoid this linking error ?

  - by Yogesh

  if i have defined a global variable(with initialization) in header file, and included this file in two file and try to compile and link, compiler gives linking error ----------------- >>headers.h #ifndef __HEADERS #define __HEADERS int x = 10; #endif >>1.c #include "headers.h" main () { } --------------------- >>2.c #include "headers.h" fun () {}

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• C/C++ Headers in NetBeans

  - by sterh

  Hi to all, I installed IDE NetBeans for C/C++ development. I created C project with main.c and makefile generated netbeans. When i add test.h file in my project and try to compile it, i see that netbeans does not see this header file, and that I would not write it, even if there are errors anyway compilation is successful. How to connect a header file in netbeans? Thanks.

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• C#: How to find the default value for a run-time Type?

  - by George Mauer

  So given a static type in your code you can do var defaultMyTypeVal = default(MyType); How would you do the same thing given a variable of Type so you can use it during runtime? In other words how do I implement the following method without a bunch of if statements or using Generics (because I will not know the type I'm passing into the method at compile time)? public object GetDefaultValueForType(Type type) { .... }

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• Boost ForEach Question

  - by bobber205

  Trying to use something like the below with a char array but it doesn't compile. But the example with short[] works fine. Any idea why? :) char someChars[] = {'s','h','e','r','r','y'}; BOOST_FOREACH(char& currentChar, someChars) { } short array_short[] = { 1, 2, 3 }; BOOST_FOREACH( short & i, array_short ) { ++i; }

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• C++: Can't use std::wstringstream

  - by Rosarch

  For some reason, my project won't compile when I try to create a wstringstream: std::wstringstream stringstream; This causes error C2079: 'stringstream' uses undefined class 'std::basic_stringstream<_Elem, _Traits, _Alloc with [_Elem=wchar_t, _Traits=std::char_traits, _Alloc=std::allocator' What am I doing wrong?

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• Including a C header which declares a variable called "new"?

  - by StackedCrooked

  I'm trying to use the OpenCA library in a C++ application. However, when including the file pki_x509_data_st.h the following code fragment is encountered: typedef struct pki_x509_callbacks_st { /* ---------------- Memory Management -------------------- */ void * (*new) (void ); void (*free) (void *x ); void * (*dup) (void *x ); This won't compile because of the "new" pointer declaration. How can I make it work?

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• Use Network Services for FDT

  - by WillDonohoe

  Hi everybody, I've recently started using FDT, for a while I was using FlashDevelop, it had a really handy feature in Compiler options where you can set UseNetworkServices to false which would stop the compiled swf from connecting to the internet and became very useful for running standalone flash apps without security warnings when loading in an external xml file etc. Does anybody know if FDT has a similar function? If there isn't a way, then no worries, I can compile the project in Flash Develop, however it would be best if I can do it from FDT. Cheers guys, Will

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• identifiers in java with different versions?

  - by GK

  as we "No keyword should be used as an Identifier in java". But there will be some words like asser or enum or any other which have been added as keyword in version 1.4, 1.5 resp. So if any older version code is used to compile with new javac, what happens if that code contains these words as an identifier?

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• Preprocessor #if directive

  - by Caslav

  I am writing a big code and I don't want it all to be in my main.c so I wrote a .inc file that has IF-ELSE statement with function and I was wondering can it be written like this: #if var==1 process(int a) { printf("Result is: %d",2*a); } #else process(int a) { printf("Result is: %d",10*a); } #endif I tried to compile it but it gives me errors or in best case it just goes on the first function process without checking the var variable (it is set to 0).

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• What does #error do?

  - by cambr

  I am guessing from # that it is only a compile-time utility. How can it be used in C/C++ programs? Did not find much about it on the internet. Any links would be helpful.

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• Is there a way to have SQL server validate object references in Stored Procs?

  - by Scott Weinstein

  The following code executes fine in SQL Server create proc IamBrokenAndDontKnowIt as select * from tablewhichdoesnotexist Of course if I try to run it, it fails with Invalid object name 'tablewhichdoesnotexist'. Is there any way to compile or verify that Stored Proc are valid?

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• Java overloading and overriding

  - by Padmanabh

  We always say that method overloading is static polymorphism and overriding is runtime polymorphism. What exactly do we mean by static here? Is the call to a method resolved on compiling the code? So whats the difference between normal method call and calling a final method? Which one is linked at compile time?

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• Which is the fastest idiomatic way to add all vectors (in the math sense) inside a Scala list?

  - by davips

  I have two solutions, but one doesn't compile and the other, I think, could be better: object Foo extends App { val vectors = List(List(1,2,3), List(2,2,3), List(1,2,2)) //just a stupid example //transposing println("vectors = " + vectors.transpose.map (_.sum)) //it prints vectors = List(4, 6, 8) //folding vectors.reduce { case (a, b) => (a zip b) map { case (x, y) => x + y } } //compiler says: missing parameter type for exp. function; arg. types must be fully known }

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• Visual Studio 2010 C++ DLL project - No output DLL file!

  - by prolog

  I can compile the DLL project without any error. It says "Build succeeded". But I don't see any DLL file in the Debug or Release folder. There are only .exp, .lib and .pdb files

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• why can't I call methods on a for-yield expression?

  - by 1984isnotamanual

  Say I have some scala code like this: // outputs 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 println( squares ) def squares = { val s = for ( count <- 1 to 10 ) yield { count * count } s.mkString(", "); } Why do I have to use the temporary val s? I tried this: def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") That fails to compile with this error message: error: value mkString is not a member of Int def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") Shouldn't mkString be called on the collection returned by the for loop?

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• .net 4 - run code from string - in C# / F# / IronRuby / IronPython.

  - by stacker

  What ways do I have in .net to run code from string? Console.WriteLine("1 + 2 * 3"); // results is 7. What other options do we have? C# - Compile the code on runtime? IronRuby / IronPython? F#?

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• compiling a c++ program including mysql

  - by wyatt

  I'm new to gcc, and trying to compile a c++ program which includes mysql.h using the command: g++ -o test test.cpp -L/usr/include/mysql -lmysqlclient -I/usr/include/mysql It works without issue, but I was wondering if someone could explain the arguments to me. I don't like using commands I don't understand. Thanks

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• Reading embedded XML file c#

  - by Pila

  How can I read from an embedded XML file - an XML file that is part of a c# project? I've added a XML file to my project and I want to read from it. I want the XML file to compile with the project because I don't want that it will be a resource which the user can see. Any idea?

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• What do I need to include in my header file for ostream

  - by Phenom

  When I try to compile my program the compiler complains about this line in a .h file that I #included. ostream & Print (ostream & stream); How can this be fixed?

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