C99 style hexadecimal floating point constants in OCaml
In OCaml, how can I parse C99-style floating point constants (either as literals or within strings) in hexadecimal form, for example 0x1.b000000000000p4
?
It looks like they are not valid literals:
# let c = 0x1.b000000000000p4;;
Characters 12-27:
let c = 0x1.b000000000000p4;;
^^^^^^^^^^^^^^^
Error: Unbound record field b000000000000p4
And there seems to be no converter Scanf
to parse them (like a C99 converter analog %a
to printf
).
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1 answer
float_of_string
should be able to parse them:
# float_of_string "0x1.199999999999Ap1";;
- : float = 2.2
However, as Alain Frisch pointed out in the OCaml bug tracker, actual support depends on the underlying libc and will not work on MSVC ports at this time.
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