Function            mid - is a number within a range

  Syntax              #include <mathhk.h>
                      (boolean) mid(a,x,b)

  Prototype in        mathhk.h

  Remarks             mid checks if x is between a and b, inclusive.

                      This function is a macro.

  Return value        returns TRUE if x is between a and b, inclusive,
                      otherwise FALSE.

  See also            nmid()