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   kbhit

   Usage
   #include <conio.h>
   int kbhit(void);

   Description
   The kbhit function checks if a keyboard key has been pressed.

   Example
   #include <stdio.h>
   #include <conio.h>
   main()
   {
        printf(" Hit any character key when ready\n");
        while(!kbhit());
             printf("\n The key pressed was (%c)\n",getch());
   }


   Return Value
   Returns non-zero if key pressed, otherwise it returns 0.