Buffering in getchar() doesnt always work the way you would expect.

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

int main()
  char x = ' ';
  printf("Press any key to continue...\n");
  x = getch();
  printf("The key you entered is: %c \n", x);
  return 0;

int getch(void)
  int ch;
  struct termios oldt;
  struct termios newt;
  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO); /* Turn off line buffering and echo */
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  ch = getchar();
  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  return ch;