float_mantissa

Summary. Return the mantissa (16-digit significand) of an XFL.

Signature.

int64_t float_mantissa(int64_t float1);

Parameters.

Name	Type	Description
float1	int64_t	The XFL to inspect.

Return value. The mantissa (1000000000000000..9999999999999999), or 0 if float1 is the XFL 0. Errors: INVALID_FLOAT (-10024) if float1 is not a valid XFL.

Common failure patterns.

• Passing a raw negative int64_t → INVALID_FLOAT.

Caveats / notes.

• The mantissa is always positive; the sign is separate — use float_sign.
• Combined with the exponent (there is no float_exponent API; test hooks derive it with a local macro), the mantissa reconstructs the exact decimal value.

Minimal example.

int64_t m = float_mantissa(float_one());   // 1000000000000000

Related APIs. float_sign, float_int.