Why isn't this compiling?

Question

#include <stdio.h>
#include <Windows.h>

int main()
{
    TCHAR buff[1024];
    GetLogicalDriveStrings(1024, buff);

    int i;
    for(i = 0; buff[i] != 0; i += 4)
        printf("%S", buff+i);
}

When I try to compile it with MSVC, I get the following errors:

Commenting out GetLogicalDriveStrings(1024, buff); causes the code to compile just fine

Answer 1

Older version of C require local variables to be declared at the beginning of a block, before things like function calls. Move the int i; to the top of the function to be with the declaration of buff.

C++ did away with this requirement, as did C99.

Answer 2

Change it to:

#include <stdio.h>
#include <Windows.h>

int main()
{
    int i;
    TCHAR buff[1024];
    GetLogicalDriveStrings(1024, buff);

    for(i = 0; buff[i] != 0; i += 4)
        printf("%S", buff+i);
}

Declare variables before calling functions in C.

Answer 3

move "int i" to the line before or after "TCHAR buff[1024]", or rename your main.c to main.cpp

btw, you should use _t series functions/macros once you decided to use TCHAR:

_tprintf(_T("..."))