#include <conio.h> int _conio_kbhit(void);
Determines whether or not a character is waiting at the keyboard. If
there is an ungetch'd character, this function returns true. Note
that if you include conio.h
, the section kbhit function is
redefined to be this function instead.
Nonzero if a key is waiting, else zero.
not ANSI, not POSIX
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