#ifdef _WIN32

#include <stdio.h>
#include <windows.h>

int main(int argc, char *argv[]) 
{
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    int columns, rows;
  
    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
    columns = csbi.srWindow.Right - csbi.srWindow.Left + 1;
    rows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
  
    printf("columns: %d\n", columns);
    printf("rows: %d\n", rows);
    return 0;
}

#else

#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>

int main (int argc, char **argv)
{
    struct winsize w;
    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);

    printf ("lines %d\n", w.ws_row);
    printf ("columns %d\n", w.ws_col);
    return 0;  // make sure your main returns int
}

#endif