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1.55e1
, but also numbers such as
0x1.fp3
written in hexadecimal format. In that format the
0x
hex introducer and the p
or P
exponent field are
mandatory. The exponent is a decimal number that indicates the power of
2 by which the significand part will be multiplied. Thus 0x1.f
is
1 15/16, p3
multiplies it by 8, and the value of 0x1.fp3
is the same as 1.55e1
.
Unlike for floating-point numbers in the decimal notation the exponent
is always required in the hexadecimal notation. Otherwise the compiler
would not be able to resolve the ambiguity of, e.g., 0x1.f
. This
could mean 1.0f
or 1.9375
since f
is also the
extension for floating-point constants of type float
.