#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
 
{
    struct winsize size;
    if (isatty(STDOUT_FILENO) == 0)
        exit(1);
    if(ioctl(STDOUT_FILENO, TIOCGWINSZ, &size)<0) {
        exit(1);
    }
    printf("%d rows, %d columns\n", size.ws_row, size.ws_col);
    return 0;
}