I have code that compiles on the GNUARM compiler, but Visual Studio 2010 issues errors. The issue involves declaring variables after the first statement in a C language file:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int i = 6;
i = i + 1;
printf("Value of i is: %d\n", i);
int j = i * 10; // <-- This is what Visual Studio 2010 complains about.
printf("Value of j is: %d\n", j);
return EXIT_SUCCESS;
}
The following code compiles without errors:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int i = 6;
int j; // <-- Declaration is now here, valid according to K&R rules.
i = i + 1;
printf("Value of i is: %d\n", i);
j = i * 10; // <-- Moved declaration of j to above.
printf("Value of j is: %d\n", j);
return EXIT_SUCCESS;
}
I'm using default settings for creating a Win32 console project. When I set "Compile as" property to "Compile as C++ (/TP)", I get compilation errors in some Visual Studio header files. (Right click on project, choose Properties → Configuration Properties → C/C++ → Advanced).
How do I tell Visual Studio 2010 to allow variable declarations after the first statement, like C++ or the current C language standard?
You don't. Visual C++ does not support C99.
You'll need to compile as C++ (and update your code accordingly) or follow the rules of C89.
(I don't know what errors you get when compiling with /TP
; I can compile your example successfully with /TP
if I add #include <stdlib.h>
for EXIT_SUCCESS
; if you provide more details, I or someone else may be able to help.)
As of Visual Studio 2013, the Visual C++ compiler supports C99 style variable declarations. More details can be found in:
http://blogs.msdn.com/b/vcblog/archive/2013/06/28/c-11-14-stl-features-fixes-and-breaking-changes-in-vs-2013.aspx
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