#include <stdio.h>

/* Demonstation of the following functions:
 *
 * att()       Attach terminal
 * getkey()    Read a single keypress
 * echo()      Turn on echo on terminal
 * noecho()    Turn off echo on terminal
 *
 * This is free software.
 */

#ifdef decus
/* For DECUS C
 */
int $$narg=1;

int getkey();
void att();
void echo();
void noecho();
#endif

#ifdef __RSX_HOST
/* For DEC PDP-11 C
 */
int getkey(void);
void att(int);
void echo(void);
void noecho(void);

#define flun __flun
#endif

int main()
{
  int c;

  att(flun(stdin));

  printf("Hello world\n");
  printf("Press a key\n");
  c = getkey();
  printf("You pressed %d\n", c);
  noecho();
  printf("Press a key\n");
  c = getkey();
  printf("You pressed %d\n", c);
  echo();
  printf("Press a key\n");
  c = getkey();
  printf("You pressed %d\n", c);
}