text: kb.
  Declaration : int kbhit();
  C programming code for kbhit
  #include <stdio.h> #include <conio.h> main() { while (!kbhit()) printf("You haven't pressed a key.\n"); return 0; }
  As long as in the above program user doesn't presses a key kbhit() return zero and (!0) i.e. 1 the condition in while loop is true and "You haven't pressed a key." will be printed again and again. As a key is pressed from the keyboard the condition in while loop become false as now kbhit() will return a non-zero value and ( !(non-zero) = 0), so the control will come out of the while loop.