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Update types.rst

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Yoichi Hirai 2016-11-25 14:51:38 +01:00 committed by GitHub
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@ -169,13 +169,6 @@ Fixed Point Numbers
Rational and Integer Literals Rational and Integer Literals
----------------------------- -----------------------------
Solidity has a number literal type for each rational number.
Integer literals and rational number literals belong to number literal types.
Moreover, all number literal expressions (i.e. the expressions that
contain only number literals and operators) belong to number literal
types. So the number literal expressions `1 + 2` and `2 + 1` both
belong to the same number literal type for the rational number three.
Number literal expressions retain arbitrary precision until they are converted to a non-literal type (i.e. by 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). using them together with a non-literal expression).
This means that computations do not overflow and divisions do not truncate This means that computations do not overflow and divisions do not truncate
@ -198,6 +191,14 @@ long as the operands are integers. If any of the two is fractional, bit operatio
and exponentiation is disallowed if the exponent is fractional (because that might result in and exponentiation is disallowed if the exponent is fractional (because that might result in
a non-rational number). a non-rational number).
.. note::
Solidity has a number literal type for each rational number.
Integer literals and rational number literals belong to number literal types.
Moreover, all number literal expressions (i.e. the expressions that
contain only number literals and operators) belong to number literal
types. So the number literal expressions `1 + 2` and `2 + 1` both
belong to the same number literal type for the rational number three.
.. note:: .. note::
Most finite decimal fractions like ``5.3743`` are not finitely representable in binary. The correct type Most finite decimal fractions like ``5.3743`` are not finitely representable in binary. The correct type
for ``5.3743`` is ``ufixed8x248`` because that allows to best approximate the number. If you want to for ``5.3743`` is ``ufixed8x248`` because that allows to best approximate the number. If you want to