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According to ISO/IEC 9899:TC3 §7§7.19.6.1:
A double argument representing a floating-point number is converted in the style ?0xh.hhhh p±dp±d, where there is one hexadecimal digit (which is nonzero if the argument is a normalized floating-point number and is otherwise unspecified) before the decimal-point character
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\[[IEEE 754|AA. C References#IEEE 754 2006]\] \[[Bryant 03|AA. C References#Bryant 03]\] Computer Systems: A Programmer's Perspective. Section 2.4 Floating Point \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] |
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FLP04-C. Check floating point inputs for exceptional values 05. Floating Point (FLP) FLP30-C. Do not use floating point variables as loop counters