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• Why does a programming language need keywords?

  - by eSKay

  For example (in C): int break = 1; int for = 2; Why will the compiler have any problems at all in deducing that break and for are variables here?

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• Is a return statement mandatory for C++ functions that do not return void?

  - by AlwaysLearning

  My Herb Schildt book on C++ says: "... In C++, if a function is declared as returning a value, it must return a value." However, if I write a function with a non-void return type and do not return anything, the compiler issues a warning instead of an error: "Control reaches end of non-void function." I use gcc (MinGW) and have set the -pedantic flag.

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• Why don't web browsers have built in validators?

  - by August Karlstrom

  As far as I know there is no web browser with built in validators for HTML, CSS and JavaScript. Developing web pages without validation is like using a compiler that doesn't do syntax analysis. Even Firefox with its excellent plugins aimed at developers like Firebug lacks plugins for CSS and JavaScript validation. Wouldn't it be useful to have these plugins? Am I missing something?

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• Is complete boost going to be included in C++0x?

  - by iammilind

  Many utilities of boost have been included as part of extended C++ TR1 currently. Is the complete boost library going to be included once the standard is officially out ? In other words, do I need boost library, if I have complete standard conforming C++11 compiler ? If not then any reason for that (Reliability cannot be an issue; as far as I know it's written by many people from standard committee) ?

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• Switching 2003 SRV to 2008 caused Asp.net application not to load DLL

  - by Tom

  Switching aged 2003 SRV to 2008 caused my Asp.net 2 application fail: The application is no more loading the required library DLL from /bin/ folder anymore. What should I change in my code or web.config to make this webapp load OK also in new 2008 server? Now I receive this error when I access the application: This type is in IMPORTS ( Dll ). Compiler Error Message: BC30002: Type 'Facebook.Entity.User' is not defined.

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• What is the undecidable problems in programming ?

  - by dani3lcara

  Now I know that what can be computed or what cannot be computed? So let me know about the undecidable problems in programming and compiler.How can we proof knowing something is impossible?

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• How can I get a list on criterias why Visual Studio does a compilation?

  - by Christoph Ungersböck

  I have the problem that C++ compiler does a recompile without any changes done. Does anyone of you know how to get a list on criterias why VisualStudio decides to start a compilation.

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• Timer to find elapsed time in a function call in C

  - by Mohit Nanda

  I want to calculate time elapsed during a function call in C, to the precision of 1 nanosecond. Is there a timer function available in C to do it? If yes please provide a sample code-snippet. Pseudo code Timer.Start() foo(); Timer.Stop() Display time elapsed in execution of foo() Environment details: - using gcc 3.4 compiler on a RHEL machine

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• c# 3.5 class List<int> class initialisation

  - by josephj1989

  I can initialize a List like new List{1,2,3,4,5}; However List does not have a constructor which accepts a single parameter. So I tried to run this through the debugger and it seems to be calling the Add method. So how does the compiler know which method to invoke to add each individual element. This may be a silly question but I am a bit confused. Thanks

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• Why does Microsoft tie .NET runtime versions to specific versions of VIsual Studio?

  - by Armentage

  Why is it that I have to upgrade to VS 2010 to build/run .NET4 projects? This seems somewhat ridiculous to me. Why should the run-time that my code runs against, or the compiler that the IDE invokes (hopefully) generically through MSBUILD rules have anything to do with the IDE I am using?

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• C++ Pointer to a function which takes an instance of a templated class as argument

  - by Nils

  I have trouble compiling a class, which has function pointers as member variables. The pointers are to functions which take an instance of a class as argument. Like template<class T, int N> double (*f)(Vector<T,N> v); I get "error: data member 'f' cannot be a member template" Compiler is gcc 4.2.

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• c - why does it make sense that indexing a character pointer is an int?

  - by hatorade

  char *a = "apple"; printf("%s\n", a); \\ fine printf("%s\n", a[1]); \\ compiler complains an int is being passed Why does indexing a string pointer give me an int? I was expecting it to just print the string starting at position one (which is actually what happens when i use &a[1] instead). why do i need to get the address?

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• Why are member constants available even if there are no instances of a its class?

  - by flockofcode

  1) Why are member constants available even if there are no instances of a its class? 2) Is the only reason why constant expressions need to be fully evaluated at compile time due to compiler replacing constant variable with literal value? 3) Since string is also an object, I would think the following would produce an error, but it doesn’t. Why? class A { const string b = “it works”; } thank you

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• can you declare data in a char** using hex?

  - by bstullkid

  lets say I have this char *something[] = { "/bi", "-c", "5", NULL, NULL }; but I want to declare it in hex, how would I do this; compiler keeps erroring out on me: char *something[] = { {0x2f,0x62,0x69}, {0x2d,0x63}, {0x35}, {0x00}, {0x00} };

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• Where does Flash Builder Plugin seaches for dotted namespace names?

  - by Suzan Cioc

  I have the following text in my MXLM sample: <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:ns1="com.infrared5.asmf.controls.flex.data.*" xmlns:ns2="com.infrared5.asmf.controls.flex.video.*" xmlns:ns3="com.infrared5.asmf.controls.flex.net.*" xmlns:ns4="jedai.controls.flex.data.*" xmlns:ns5="jedai.controls.flex.video.*" xmlns:ns6="jedai.controls.flex.net.*"> Last 6 namespaces are defined as some "dotted" name pathes. Where does compiler look for them and in which order?

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• Reading a large text file to memory in C++

  - by NoneType

  Is there a way to read a large text file (~60MB) into memory at once (like a compiler flag to increase program memory limit) ? Currently, ofstream's open function throws a segmentation fault while trying to read this file. ifstream fis; fis.open("my_large_file.txt"); // Segfaults here The file just consists of rows of the form number_1<tabspace>number_2 i.e., two numbers separated by a tabspace.

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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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• Can a macro also generate a method name?

  - by mystify

  Is it generally valid that a macro is used to create a method name? I mean...actually it's just simple text replacement before the compiler actually runs, right?

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• C# empty statement

  - by dotnetdev

  In C#, I can write something like: using (new MyDisposableClass().MethodA()); The semicolon causes a compiler warning to be shown which states possible mistaken empty statement. I haven't run the above code but won't the method still be called? What uses is there of this type of coding convention? I saw another thread on here about this but I ask in case there areny differences now/therefore different replies. Thanks

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• Clang doesn't support the Lock Prefix. How shall I workaround?

  - by Niels P.

  Assume this code: static inline void inc(int64_t* atomic) { __asm__ __volatile__ ( "lock incq %0\n" : "=m" (*atomic) : "m" (*atomic) ); } The Clang compiler doesn't support the lock prefix (yet?). What shall I do now?

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• What's the term for a program or system that is used to maintain itself?

  - by eft

  And I don't mean skynet. I'm thinking of say a compiler application that is used to compile itself, a VCS that tracks its own source code etc.

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• recursive typedef

  - by FredOverflow

  Is the following allowed? typedef Foo<Bar> Bar; My compiler complains that 'class Bar' has a previous declaration as 'class Bar'.

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• does passing __m128i objects by reference to inline function cause these objects to be moved to stac

  - by ~buratinas

  Hello, I'm writing transpose function for 8x16bit vectors with SSE2 intrinsics. Since there are 8 arguments for that function (a matrix of 8x8x16bit size), I can't do anything but pass them by reference. Will that be optimized by the compiler (I mean, will these __m128i objects be passed in registers instead of stack)? Code snippet: inline void transpose (__m128i &a0, __m128i &a1, __m128i &a2, __m128i &a3, __m128i &a4, __m128i &a5, __m128i &a6, __m128i &a7) { .... }

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• I want to know the behaviour of break statement in C. Does it work only for ';for-while-do-switch' o

  - by avanish

  Suppose, I have a 'if statement' inside a 'for-loop'. for( ; ; ) { ------- if( ) { printf(" inside if"); break; }//if printf("inside for"); }//for now, will the 'break-statement' cause the compiler to come out of the 'for-loop' or will it only come out of the if loop on the 'if-condition' being satisfied.

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• LINQ: How do I concatenate a list of integers into comma delimited string?

  - by Haoest

  It's probably something silly I missed, but I try to concatenate a list of integers instead of summing them with: integerArray.Aggregate((accumulator, piece) => accumulator+"," + piece) The compiler complained about argument error. Is there a slick way to do this without having to go through a loop?

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