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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 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. They are interpreted as decimals. For example, ``69`` means sixty nine.
Octal literals do not exist in Solidity and leading zeros are invalid. 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``. 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``. Examples include ``2e10``, ``-2e10``, ``2e-10``, ``2.5e1``.
Underscores can be used to separate the digits of a numeric literal to aid readability. Underscores can be used to separate the digits of a numeric literal to aid readability.