visual studio - Which version of C is supported by VS2019 compiler?

Question

How can I know which version of C is supported by the VS2019 compiler? I looked in the project C/C++ and Linker command lines and found no -std=Cxx flag. The following code compiles:

for (int i = index; i < nb_users - 1; i++) {
    users[i] = users[i + 1];
}

So I guess it's C99 according to this, but is there a way to check this somewhere in VS2019?

Answer 1

VS2019 supports ANSI C90 plus a few other features from a few later standards that are required in C++.

For example, you can tell that C99 is not fully supported in MSVC with this code, which will fail to compile:

int foo(int n, char *s)
{
    char s2[n];
    strcpy(s2, s);
    return !strcmp(s, s2);
}

This specific feature (variable-length arrays) is not supported in MSVC, while the feature you mentioned (for loop initial declaration) is.