8.38 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.

Syntax

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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