| Floating-point formats |
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| IEEE 754 |
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| Other |
| Alternatives |
decimal128 is a decimal floating-point computer number format that occupies 128 bits in computer memory. Formally introduced in IEEE 754-2008,[1] it is intended for applications where it is necessary to emulate decimal rounding exactly, such as financial and tax computations.[2]
decimal128 supports 34 decimal digits of significand and an exponent range of −6143 to +6144, i.e. ±0.000000000000000000000000000000000×10−6143 to ±9.999999999999999999999999999999999×106144. Because the significand is not normalized, most values with less than 34 significant digits have multiple possible representations; 1 × 102=0.1 × 103=0.01 × 104, etc. Zero has 12288 possible representations (24576 including negative zero).
- ^ IEEE Computer Society (2008-08-29). IEEE Standard for Floating-Point Arithmetic. IEEE. doi:10.1109/IEEESTD.2008.4610935. ISBN 978-0-7381-5753-5. IEEE Std 754-2008.
- ^ Cowlishaw, Mike (2007). "Decimal Arithmetic FAQ – Part 1 – General Questions". speleotrove.com. IBM Corporation. Retrieved 2022-07-29.