is_nzero Function (ROM Call 0x300)

AMS 1.01 or higher math.h, timath.h

short is_nzero (float x);

Checks whether the argument is negative zero.

is_nzero returns TRUE if x is a negative zero (i.e. infinitely small negative quantity, see NEGATIVE_ZERO), else returns FALSE. This function is an alias for TIOS function originally called is_float_negative_zero.