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Visual Studio Error C2057

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Floating-point values aren't. -- -- Pete Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The Standard C++ Library Extensions: a Tutorial and Reference." (www.petebecker.com/tr1book) Jan 20 '07 #5 P: n/a Daniel T. Isn't the 'const' required in the above context? Consider the following code in which T is also constant but can wary with every run of the application: #include int main() { double L; std::cin >L; const int T = up vote 3 down vote favorite 1 This is my code: int main() { const int LEN = 5; int x[LEN]; } VS10 says: error C2057: expected constant expression error C2466: have a peek here

Should the sole user of a *nix system have two accounts? GCC compiles the statement : "unsigned char message[getLen(cipher)];" But the same code won't compile with MS VS. Its giving me System.AccessViolationException error. Which is much safer. More Bonuses

C2057 C++

Is there a reason why some people still haven't switched to the C99 standard yet? Unknown symbol on schematic (Circle with "M" underlined) Can ăȘし be used in response to a binary question? Not the answer you're looking for? Here is what the standard has to say [5.19/1]: [...] An integral constant-expression can involve only literals (2.13), enumerators, const variables or static data members of integral or enumeration types initialized

Not the answer you're looking for? Why doesn't my program work? If there was another constructor that allowed a different size, then the compiler could not assume that size was always 4096, so it gives the compile-time error instead. Dynamic Array C++ Because T is not constant at compile-time, Huh?

Floating-point values aren't. phidax replied Apr 7, 2011 void matrix(int dim, double idM[][dim]) { for (int i = 0; i < dim; i++) { for (int j = 0; j < dim; j++) { Creating & Deleting Multidimensonal Arrays Will there alternate Java Tibrv library to test? Homepage The code is valid in C99 and C++. –Karthik Dec 16 '10 at 6:27 @Jon With -ansi, GCC gives warning: ISO C90 forbids variable-size array ‘x’ –Josh Lee Dec

The ones which dont involve system calls atleast. –tomkaith13 Dec 14 '09 at 12:39 g++ does not use ISO C++ by default, it uses ISO with GNU extensions. C++ Vector MS Visual C doesn't support C99. As sje397's comment suggests, try some name other than LEN for the length? Quicker and quieter than a mouse, what am I?

Error C2466: Cannot Allocate An Array Of Constant Size 0

Top Best Answer 0 Mark this reply as the best answer?(Choose carefully, this can't be changed) Yes | No Saving... http://stackoverflow.com/questions/11765677/c2057-error-on-const-value-definie-in-constructor-inialization-list It's not a really big deal when all the #defines in one .cpp unit, but can still be annoying. –Sergey Tachenov Dec 16 '10 at 6:28 | show 6 more comments C2057 C++ You will have to do something like this: int* newAr = new int[size]; or better yet use a vector: std::vector(size); The reason I suggest vector over dynamically allocating an array is C++ Expected Constant Expression Browse other questions tagged c++ visual-c++ or ask your own question.

asked 3 years ago viewed 5573 times active 3 years ago Blog Stack Overflow Podcast #93 - A Very Spolsky Halloween Special Linked 0 Return a generated array in C++ Related navigate here ctarsoaga replied Apr 17, 2006 In fact ISO C99 allows variable length arrays. Using Elemental Attunement to destroy a castle Another word for something which updates itself automatically Disproving Euler proposition by brute force in C What is the parentage of Gil-galad? GCC, however, compiles ISO C++. C Malloc Array

Not the answer you're looking for? Namit Top Best Answer 1 Mark this reply as the best answer?(Choose carefully, this can't be changed) Yes | No Saving... My 21 yr old adult son hates me Is there a name for the (anti- ) pattern of passing parameters that will only be used several levels deep in the call Check This Out This documentation is archived and is not being maintained.

How much more than my mortgage should I charge for rent? Browse other questions tagged c++ arrays visual-c++ visual-studio-2008 const or ask your own question. What about this warning? "ComeauTest.c", line 7: error: constant value is not known int arr[T]; ^ Why is that?

Why doesn't my programwork?

But supporting C99 is a lot more work. –MSalters Dec 14 '09 at 12:56 4 Also, C99 features like VLAs are not part of Standard C++, or even of C++0x, In C89 the size of an array must be a constant expression. All defines are expanded by the pre-processor, but that is all, if you want code evaluated at compile-time you can do some things with templates, but I don't think that's what Why does the Developer Console show different extensions like "apxc" and "apxt"?

Using "están" vs "estás" when refering to "you" Why does the Developer Console show different extensions like "apxc" and "apxt"? In order for T to be a compile-time constant, it has to have an initializer that's a compile-time constant. Join them; it only takes a minute: Sign up How come the compiler thinks this variable isn't constant? this contact form What are the computer-like objects in the Emperor's throne room?

Browse other questions tagged c++ c compiler-construction compiler-errors or ask your own question. A question concerning Wolfram Alpha Understanding memory allocation for large integers in Python Is there an English idiom for provocative titles, something like "yellow title"? Regds Vittala G Top Best Answer 0 Mark this reply as the best answer?(Choose carefully, this can't be changed) Yes | No Saving... error C2057: expected constant expression error C2466: cannot allocate an array of constant size 0 error C2087: 'idM' : missing subscript These three errors because of idM[j] = 1.0; and idM[j]

The GNU C compiler allows you to use them. Why do I get this?3Why would the VB.NET compiler think an interface isn't implemented when it is?1Generating Fibonacci Numbers Using variable-Length Arrays Code Compiler Error42How to compile .c file with OpenSSL Because T is not constant at compile-time, which it needs to be for the compiler to know how much space to allocate on the stack. Floating literals (2.13.3) can appear only if they are cast to integral or enumeration types.

more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Join them; it only takes a minute: Sign up oaidl.h(319): error C2057: expected constant expression up vote 1 down vote favorite I've recently switched from Visual Studio 2010 to Visual Studio The crux of the matter seems to be that non-integer arithmetic expressions do not qualify as compile time constants (allowing the compiler and the target processor to differ in their opinion Is there an English idiom for provocative titles, something like "yellow title"?

Won't Compile? Isn't the 'const' required in the above context? "ComeauTest.c", line 7: error: constant value is not known int arr[T]; ^ Why is that? System.Collections.Arraylist Error How To Write Strstr() Problems Finding Area of Polygon with C Code factorial White Papers & Webcasts The ROI of Pluralsight: A Small Investment that Pays Big Blog Articles Try saving the file with .cpp extension.

Why doesn't my simple program work??? Hot Network Questions Right inverse of f(x)= x² that is not sqrt(x) or -sqrt(x) In the future, around year 2500, will only one language exist on earth?