#include <stdio.h>
#include <termios.h>

static struct termios stored_settings,new_settings;

int main(void)
{
  char c;
  int count=1;

  tcgetattr(0,&stored_settings);
  new_settings = stored_settings;
  new_settings.c_lflag &= (~ICANON);
  new_settings.c_lflag &= (~ECHO);
  new_settings.c_cc[VTIME] = 0;
  new_settings.c_cc[VMIN] = 1;
  tcsetattr(0,TCSANOW,&new_settings);

  printf("Hit '+'/'-' key to count up/down, 'q' to exit.\n");
  printf("%d\n",count);

  while((c=getchar()) != 'q'){
    if(c == '+')count++;
    if(c == '-')count--;
    printf("%d\n",count);
  }

  tcsetattr(0,TCSANOW,&stored_settings);
}