From 0000bfc604b985c47ab153f4172596b860c7cce8 Mon Sep 17 00:00:00 2001 From: Balajiganapathi S Date: Sat, 21 Oct 2017 01:05:08 +0530 Subject: Allow underscores in numbers. --- docs/types.rst | 3 +++ 1 file changed, 3 insertions(+) (limited to 'docs') diff --git a/docs/types.rst b/docs/types.rst index fbc83972..84e58fde 100644 --- a/docs/types.rst +++ b/docs/types.rst @@ -284,6 +284,9 @@ 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 digits of a numeric literal to aid readability. +For example, ``123_000``, ``0x2eff_abde``, ``1_233e34_89`` are all valid. Underscores are only allowed between two digits. + 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 -- cgit v1.2.3 From 09a36cba0223c16248335703412cee019c7aa59f Mon Sep 17 00:00:00 2001 From: Balajiganapathi S Date: Wed, 25 Oct 2017 13:42:07 +0530 Subject: Add stricter hex underscore rules --- docs/types.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'docs') diff --git a/docs/types.rst b/docs/types.rst index 84e58fde..4bade37c 100644 --- a/docs/types.rst +++ b/docs/types.rst @@ -284,8 +284,8 @@ 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 digits of a numeric literal to aid readability. -For example, ``123_000``, ``0x2eff_abde``, ``1_233e34_89`` are all valid. Underscores are only allowed between two digits. +Underscores can be used to separate the digits of a numeric literal to aid readability. +For example, ``123_000``, ``0x2eff_abde``, ``1233_e348_9a`` are all valid. Underscores are only allowed between two digits. For hex literals, underscores are only allowed to separate groups of 4 hex digits. 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). -- cgit v1.2.3 From b9222808f61e00833f8c11cd196cafb50ec9e1b9 Mon Sep 17 00:00:00 2001 From: Christian Parpart Date: Fri, 3 Aug 2018 16:13:52 +0200 Subject: Cleanup & polish numbers-with-underscores parsing, also improving tests. --- docs/types.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'docs') diff --git a/docs/types.rst b/docs/types.rst index 4bade37c..5c4a30ca 100644 --- a/docs/types.rst +++ b/docs/types.rst @@ -285,7 +285,9 @@ Scientific notation is also supported, where the base can have fractions, while 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, ``123_000``, ``0x2eff_abde``, ``1233_e348_9a`` are all valid. Underscores are only allowed between two digits. For hex literals, underscores are only allowed to separate groups of 4 hex digits. +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). -- cgit v1.2.3