Clear Screen in C

clear_screen.c

#include <stdlib.h>
#include <stdio.h>

void clear_screen(){
    #ifdef _WIN32
        system("cls");
    #elif defined(unix) || defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))
        system("clear");
    //add some other OSes here if needed
    #else
        #error "OS not supported."
        //you can also throw an exception indicating the function can't be used
    #endif
}

int main()
{
    clear_screen();
    system("ls");
    return 0;
}