getchar()


__CRT_INLINE int __cdecl __MINGW_NOTHROW getchar (void)
{
  return (--stdin->_cnt >= 0)
    ?  (int) (unsigned char) *stdin->_ptr++
    : _filbuf (stdin);
}

从stdin流读取的。。。取第一位


getch()

* Low level console I/O functions. Pretty please try to use the ANSI
* standard ones if you are writing new code.
_CRTIMP int __cdecl __MINGW_NOTHROW    getch (void);
_CRTIMP int __cdecl __MINGW_NOTHROW    getche (void);