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Merge pull request #12374 from ethereum/clarifyLiterals

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Some clarifications on literals.
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chriseth 2021-12-06 18:48:14 +01:00 committed by GitHub
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docs/types/value-types.rst
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@ -437,14 +437,16 @@ an error. You can prepend (for integer types) or append (for bytesNN types) zero
Rational and Integer Literals
-----------------------------
Integer literals are formed from a sequence of numbers in the range 0-9.
Integer literals are formed from a sequence of digits in the range 0-9.
They are interpreted as decimals. For example, ``69`` means sixty nine.
Octal literals do not exist in Solidity and leading zeros are invalid.
Decimal fraction literals are formed by a ``.`` with at least one number on
Decimal fractional literals are formed by a ``.`` with at least one number on
one side. Examples include ``1.``, ``.1`` and ``1.3``.
Scientific notation is also supported, where the base can have fractions and the exponent cannot.
Scientific notation in the form of ``2e10`` is also supported, where the
mantissa can be fractional but the exponent has to be an integer.
The literal ``MeE`` is equivalent to ``M * 10**E``.
Examples include ``2e10``, ``-2e10``, ``2e-10``, ``2.5e1``.
Underscores can be used to separate the digits of a numeric literal to aid readability.