Why does Visual Studio c++ swear?

Question

C++ / C#

In Visual Studio for the first time, and here
It is strange, since the same CodeBlocks does not say anything about this at all
Help, please

const int n = 10;
int mas[n];

Answer 1

It's not strange - different compilers behave differently. In addition, the degree of abuse of the compiler is very dependent on the compilation options.
Here's what they write about this error in Microsoft .
The description doesn't really help either.
Try making n static. Or define as define.

Answer 2

I don't swear

made a project according to the console application template. inserted your lines. there are no errors
like in the original version, where the screen was, the error line was 20.
and the 20th line you have there, this is the closing curly brace main
, all this makes you think that the problem is not in these 2 lines