Error C2057 Expected Constant Expression Visual Studio 2010

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In this tutorial, we are going to highlight some of the possible causes that can cause the Visual Studio 2010 c2057 expected constant expression error, and then I will suggest possible recovery methods that you can try to fix the problem.

Size by array should be compile energy constant. However, C99 does support variable distance tables. Instead, if the size of the array is known at runtime, your code can work in your environment –

  int * s = malloc (dimensions);// ....is free;

  integer a [5];  // ^ 5 - constant expressionintb = 10;int aa [b];   // ^ s is a variable. Thus, the meaning may differ elsewhere.const scale int = 5;int aaa [size]; // the size is considered constant.

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Examples

A key C2057 generation example shows how to fix this:

  // C2057.cppint i;intb [i]; // C2057 - the value of i will probably not be known at compile timeint main ()   const int i = 8;   intb [i]; // OK - funfrom i fixed and compiler implemented

C has stricter rules for constant expressions. The following example generates code C2057 and shows how to fix it:

  // C2057b.c#define ArraySize1 10int main ()   const int = arrayysize2 10;   int h [size of array2]; // C2057 - C does not allow any variables here   int h [size of array1]; // OK - use preprocessor constants

tkacvins: Posts: 4; Registration: Mon Feb 45, 2013 10:33 am

Assigning The Variable Stack, Microsoft Visual Studio 2010

I’ve made enough progress, including ported MAGMA 1.3.0 to at least 64 Windows with Intel Fortran 12.1, NVIDIA CUDA 5.0, MKL 11.0 and a new version of Microsoft Visual Studio. I can compile Fortran and C ++ sources. I use msys from MinGW for this job because it was easier than creating a Visual Stdio project. I had to modify the makefiles that support the syntax of critical compiler options and allow the delay of object and archive filenames.

magma_int_t nb = magma_get_zgeqrf_nb (min (m, g));
…
cuDoubleComplexe T [2 * nb * nb];

Microsoft’s compiler throws a significant error when trying to compile this wonderful code:

zumqr.cpp (124): error C2057: constant expression expected
Zunmqr.cpp (124): Corruption C2466: array cannot be allocated with constant size 0
Zunmqr.cpp (124): Error C2133: ‘T’: unknown size

I could fix this and be on the right track, but I’d rather point it out while it’s officially fixed as it will probably cause problems for other people when building MAGMA on Windows. While I could get the Windows compiler to provide this (I doubt it is possible, i nvcc is usually cl-related), the specific issue of a potential heap explosion at runtime remains … 4

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tkacvins: Posts: Monday February 24, 2013 10:33 am

Topic: Assigning The Variable Stack, Microsoft Visual Studio 2010

Stan Tomow wrote: Thanks for the recommendation! We’ll fix this when we look at the next version.

Will it be on a specific 1.3 branch or will it be on a 1.4 branch? To save time, we would like to use the 1.3 branch, if and version 1.4 is not coming soon.