BS 7237:1990

Committees responsible
National foreword
1. Scope
1.1 Implementation objectives
1.2 Inclusions
1.3 Exclusions
2. Definitions
3. Formats
3.1 Sets of values
3.2 Basic formats
3.3 Extended formats
3.4 Combinations of formats
4. Rounding
4.1 Round to nearest
4.2 Directed roundings
4.3 Rounding precision
5. Operations
5.1 Arithmetic
5.2 Square root
5.3 Floating-point conversions
5.4 Conversions between floating point and integer
5.5 Round floating-point number to integral value
5.6 Binary - decimal conversion
5.7 Comparison
6. Infinity, NaNs and signed zero
6.1 Infinity arithmetic
6.2 Operations with NaNs
6.3 The sign bit
7. Exceptions
7.1 Invalid operations
7.2 Division by zero
7.3 Overflow
7.4 Underflow
7.5 Inexact
8. Traps
8.1 Trap handler
8.2 Precedence
Appendix
A. Recommended functions and predicates

It is intended that implementation of a floating-point system can be realized entirely in software, hardware, or combination of both. It specifies basic and extended floating-point number formats, add, subtract, multiply, divide, square root, remainder and compare operations, conversions between integer and floating-point numbers, conversions between different floating-point formats, conversions between basic format floating-point numbers and decimal strings, and floating-point exceptions and their handling, including non-numbers. Excludes formats of decimal strings and integers, interpretation of the signs and significant fields of NaNs, or binary to decimal conversions to and from extended formats.