Effective value
An effective value is the value actually represented by a literal after the language’s conversion and rounding rules are applied.
Modern C, Third Edition
An effective value is the value actually represented by a literal after the language's conversion and rounding rules are applied.
- How it is used
- Clarifies how integer literal spelling, base, suffix, and conversion determine the value assigned to an object.
- How deep it goes
- Works through integer literal values, types, and conversions, but does not develop a general account of floating-point rounding.
- Examples
- Uses negative decimal literals, hexadecimal boundary values, suffixed literals such as 1U and 1ULL, and comparative tables.
- What you can do after
- Evaluate integer literal values and types, choose safer negative-literal spellings, and avoid relying on nonportable signed conversions.
Modern C
An effective value is the value actually represented by a C floating-point constant after the implementation's rounding or truncation.
- How it is used
- Clarifies why a written decimal floating-point constant may not denote its apparent mathematical value.
- How deep it goes
- Defines implementation rounding and truncation, then contrasts decimal approximation with hexadecimal representation.
- Examples
- Uses `0.2`, its expanded effective value, and hexadecimal spellings such as `0x1.99999AP-3F`.
- What you can do after
- Evaluate why decimal and hexadecimal floating-point spellings can represent different or identical values.
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