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Merge pull request #4684 from ethereum/underscores_in_numeric_literals

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[BREAKING] Underscores in numeric literals
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chriseth
2018-08-08 21:36:57 +02:00
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parent 551343ae3e b9222808f6
commit d634d20b5b
15 changed files with 256 additions and 14 deletions
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docs/types.rst
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@@ -284,6 +284,11 @@ one side. Examples include ``1.``, ``.1`` and ``1.3``.
Scientific notation is also supported, where the base can have fractions, while the exponent cannot.
Examples include ``2e10``, ``-2e10``, ``2e-10``, ``2.5e1``.
Underscores can be used to separate the digits of a numeric literal to aid readability.
For example, decimal ``123_000``, hexadecimal ``0x2eff_abde``, scientific decimal notation ``1_2e345_678`` are all valid.
Underscores are only allowed between two digits and only one consecutive underscore is allowed.
There is no additional semantic meaning added to a number literal containing underscores.
Number literal expressions retain arbitrary precision until they are converted to a non-literal type (i.e. by
using them together with a non-literal expression).
This means that computations do not overflow and divisions do not truncate