Hexadecimal floating-point constant
A hexadecimal floating-point constant is a C floating-point literal with a hexadecimal significand and a binary exponent introduced by p or P.
Modern C, Third Edition
A hexadecimal floating-point literal is a C floating-point literal written with a hexadecimal significand and a binary exponent introduced by P or p.
- How it is used
- Specifies floating-point values in a form suited to exact representations.
- How deep it goes
- Defines the significand, P exponent, and numerical interpretation, but does not discuss compiler implementation or portability details.
- Examples
- Uses 0x1.7aP-13 and type-suffixed hexadecimal constants for float, double, and long double.
- What you can do after
- Evaluate a hexadecimal significand scaled by a power of two.
Read how Modern C, Third Edition explains hexadecimal floating-point constant →
Modern C
A hexadecimal floating-point constant is a C floating-point literal written with hexadecimal significand digits and a binary power exponent.
- How it is used
- Specifies floating-point values in a form closely corresponding to binary representations.
- How deep it goes
- Explains syntax, approximation, representation, and suffix-selected types, but does not develop floating-point internals.
- Examples
- Uses 0x1.99999AP-3, 0xC.CCCCCCCCCCCCCCDP-6, and typed variants of 0.2.
- What you can do after
- Evaluate hexadecimal floating-point spellings and select float, double, or long double with suffixes.
Read how Modern C explains hexadecimal floating-point constant →
Related concepts
- C99produced by · C99 is the ISO standard revision of the C programming language published in 1999.
- literalkind of · A literal is a language construct that directly denotes a fixed value or specifies an exact value permitted by a type.
- binary representationequivalent to · Binary representation expresses information or values using a base-two positional system with two symbols, conventionally zero and one.
- hexadecimal numbercontrasts with · A hexadecimal number is a numeral represented in the base-sixteen positional system using symbols 0–9 and A–F for values zero through fifteen.
- floating-point constantkind of · A floating-point constant is source-code numeric literal syntax that denotes a value in a floating-point type.
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