Function            fsgn - sign of a real

  Syntax              #include <mathhk.h>
                      (int) fsgn(x)

  Prototype in        mathhk.h

  Remarks             fsgn will determine the sign of x. Zero is
                      considered positive.

                      This function is a macro.

                      The macro fsign() is defined as fsgn().

  Return value        returns -1 if x is negative, otherwise 1.

  See also            isgn(), lsgn()