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re-enable BigInt hexadecimal literals #23546

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merged 6 commits into from
Oct 11, 2020
Merged

re-enable BigInt hexadecimal literals #23546

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d67442d
re-enable BigInt hexadecimal literals
rfourquet Sep 1, 2017
fff4d9f
re-add tests
rfourquet Sep 2, 2017
3691fae
update "noteworthy differences from C/C++"
rfourquet Sep 2, 2017
c261522
fix code quote in docs (fredrikekre)
rfourquet Sep 2, 2017
fcc0c18
remove now redundant example
rfourquet Oct 4, 2020
426adaa
add NEWS
rfourquet Oct 10, 2020
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update "noteworthy differences from C/C++"
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@rfourquet
rfourquet committed Oct 10, 2020
commit 3691faee5393c435f42d2dea20731d104993114a
8 changes: 5 additions & 3 deletions doc/src/manual/noteworthy-differences.md
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Expand Up @@ -271,16 +271,18 @@ For users coming to Julia from R, these are some noteworthy differences:
a larger size type, such as `Int64` (if `Int` is `Int32`), `Int128`, or the arbitrarily large
`BigInt` type. There are no numeric literal suffixes, such as `L`, `LL`, `U`, `UL`, `ULL` to indicate
unsigned and/or signed vs. unsigned. Decimal literals are always signed, and hexadecimal literals
(which start with `0x` like C/C++), are unsigned. Hexadecimal literals also, unlike C/C++/Java
(which start with `0x` like C/C++), are unsigned, unless when they encode more than 128 bits,
in which case they are of type ``BigInt``. Hexadecimal literals also, unlike C/C++/Java
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``BigInt`` -> `BigInt`

and unlike decimal literals in Julia, have a type based on the *length* of the literal, including
leading 0s. For example, `0x0` and `0x00` have type [`UInt8`](@ref), `0x000` and `0x0000` have type
[`UInt16`](@ref), then literals with 5 to 8 hex digits have type `UInt32`, 9 to 16 hex digits type
`UInt64` and 17 to 32 hex digits type `UInt128`. This needs to be taken into account when defining
`UInt64`, 17 to 32 hex digits type `UInt128`, and more that 32 hex digits type `BigInt`.
This needs to be taken into account when defining
hexadecimal masks, for example `~0xf == 0xf0` is very different from `~0x000f == 0xfff0`. 64 bit `Float64`
and 32 bit [`Float32`](@ref) bit literals are expressed as `1.0` and `1.0f0` respectively. Floating point
literals are rounded (and not promoted to the `BigFloat` type) if they can not be exactly represented.
Floating point literals are closer in behavior to C/C++. Octal (prefixed with `0o`) and binary
(prefixed with `0b`) literals are also treated as unsigned.
(prefixed with `0b`) literals are also treated as unsigned (or `BigInt` for more than 128 bits).
* String literals can be delimited with either `"` or `"""`, `"""` delimited literals can contain
`"` characters without quoting it like `"\""`. String literals can have values of other variables
or expressions interpolated into them, indicated by `$variablename` or `$(expression)`, which
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