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Conventions and Feedback Introduction Compiler Command-line Options Language Extensions Preprocessor extensions #assert #include_next #unassert #warning C99 language features available in C90 // comments Subscripting struct Flexible array members C99 language features available in C++ and C90 Variadic macros long long restrict Hexadecimal floats Standard C language extensions Constant expressions Array and pointer extensions Block scope function declarations Dollar signs in identifiers Top-level declarations Benign redeclarations External entities Function prototypes Standard C++ language extensions ? operator Declaration of a class member friend Read/write constants Scalar type constants Specialization of nonmember function templates Type conversions Standard C and Standard C++ language extensions Address of a register variable Arguments to functions Anonymous classes, structures and unions Assembler labels Empty declaration Hexadecimal floating-point constants Incomplete enums Integral type extensions Label definitions Long float Nonstatic local variables Structure, union, enum, and bitfield extensions Compiler-specific Features C and C++ Implementation Details Semihosting ARMv6 SIMD Instruction Intrinsics Via File Syntax Standard C Implementation Definition Standard C++ Implementation Definition C and C++ Compiler Implementation Limits

Compiler Reference Guide

Hexadecimal floating-point constants

ARM Compiler toolchain v5.02 for µVision Compiler Reference
Home > Language Extensions > Hexadecimal floating-point constants

Hexadecimal floating-point constants

The ARM compiler implements an extension to the syntax of numeric constants in C to enable explicit specification of floating-point constants as IEEE bit patterns.

Show/hideSyntax

The syntax for specifying floating-point constants as IEEE bit patterns is:

0f_n

Interpret an 8-digit hex number n as a float constant. There must be exactly eight digits.

0d_nn

Interpret a 16-digit hex number nn as a double constant. There must be exactly 16 digits.

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