#include <unistd.h>
#include <ncurses.h>


int main(int argc, char* argv[])
{

  initscr();
  clear();

  int dirx = +1, diry = +1;
  int row = 10, col=10;
  for(int i=0; i<20; i+=1){
   clear();
    move(row, col);
    if (row < 10 || row > 17) dirx *= -1;
    if (col < 10 || col > 17) diry *= -1;
    row += dirx;
    col += diry;

    addstr("Hello world");
    refresh();
    sleep(1);
  }
  move(30,5);
  addstr("hit a key to exit");
  getch();
  endwin();
}