is_zero(x) Returns True if x is a zero; otherwise returns False.

is_subnormal(x) Returns True if x is subnormal; otherwise returns False.

is_snan(x) Returns True if x is a signaling NaN; otherwise returns False.

is_signed(x) Returns True if x is negative; otherwise returns False.

is_qnan(x) Returns True if x is a quiet NaN; otherwise returns False.

is_normal(x) Returns True if x is a normal number; otherwise returns False.

is_nan(x) Returns True if x is a qNaN or sNaN; otherwise returns False.

is_infinite(x) Returns True if x is infinite; otherwise returns False.

is_finite(x) Returns True if x is finite; otherwise returns False.

is_canonical(x) Returns True if x is canonical; otherwise returns False.