Creating a directory In C or C++

If you can use C++ (as suggested by the selected tags) and boost libraries, Boost filesystem can help you with the create_directory function.

If you don't want to have all boost libraries available in your project, you may download a tool called bcp to extract only the subset you need, in your case boost filesystem and its dependencies.

Use the mkdir function.

#include <sys/stat.h>
#include <sys/types.h>
int mkdir(const char *pathname, mode_t mode);

Call mkdir(2).