#include <stdio.h> 
  #include <stdlib.h> 
  #include <termios.h> 
   
  static struct termios oldt; 
   
  void restore_terminal_settings(void) 
  { 
      tcsetattr(0, TCSANOW, &oldt);  /* Apply saved settings */ 
  } 
   
  void disable_waiting_for_enter(void) 
  { 
      struct termios newt; 
   
      /* Make terminal read 1 char at a time */ 
      tcgetattr(0, &oldt);  /* Save terminal settings */ 
      newt = oldt;  /* Init new settings */ 
      newt.c_lflag &= ~(ICANON | ECHO);  /* Change settings */ 
      tcsetattr(0, TCSANOW, &newt);  /* Apply settings */ 
      atexit(restore_terminal_settings); /* Make sure settings will be restored when program ends  */ 
  } 
   
  int main() 
  { 
      int ch; 
   
      disable_waiting_for_enter(); 
   
      /* Key reading loop */ 
      while (1) { 
          ch = getchar(); 
          if (ch == 'Q') return 0;  /* Press 'Q' to quit program */ 
          printf("You pressed %c\n", ch); 
      } 
   
      return 0; 
  }