Editing Integer (computer science) (section)

== Syntax ==
{{main|Integer literal}}

[[Integer literal]]s can be written as regular [[Arabic numerals]], consisting of a sequence of digits and with negation indicated by a [[hyphen-minus|minus sign]] before the value. However, most programming languages disallow use of commas or spaces for [[digit grouping]]. Examples of integer literals are:

* <code>42</code>
* <code>10000</code>
* <code>-233000</code> <!-- do not use the real minus sign, as that isn't part of a literal -->

There are several alternate methods for writing integer literals in many programming languages:

* Many programming languages, especially those influenced by [[C (programming language)|C]], prefix an integer literal with <code>0X</code> or <code>0x</code> to represent a [[hexadecimal]] value, e.g. <code>0xDEADBEEF</code>. Other languages may use a different notation, e.g. some [[assembly language]]s append an <code>H</code> or <code>h</code> to the end of a hexadecimal value.
* [[Perl]], [[Ruby (programming language)|Ruby]], [[Java (programming language)|Java]], [[Julia (programming language)|Julia]], [[D (programming language)|D]], [[Go (programming language)|Go]], [[C Sharp (programming language)|C#]], [[Rust (programming language)|Rust]], [[Python (programming language)|Python]] (starting from version 3.6), and [[PHP]] (from version 7.4.0 onwards<ref>https://www.php.net/manual/en/language.types.integer.php</ref>) allow embedded [[underscore]]s for clarity, e.g. <code>10_000_000</code>, and fixed-form [[Fortran]] ignores embedded spaces in integer literals. C (starting from [[C23 (C standard revision)|C23]]) and C++ use single quotes for this purpose.
* In [[C (programming language)|C]] and [[C++]], a leading zero indicates an [[octal]] value, e.g. <code>0755</code>. This was primarily intended to be used with [[Modes (Unix)|Unix modes]]; however, it has been criticized because normal integers may also lead with zero.<ref>ECMAScript 6th Edition draft: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-numeric-literals {{webarchive|url=https://web.archive.org/web/20131216202526/https://people.mozilla.org/~jorendorff/es6-draft.html |date=2013-12-16 }}</ref> As such, [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[Haskell]], and [[OCaml]] prefix octal values with <code>0O</code> or <code>0o</code>, following the layout used by hexadecimal values.
* Several languages, including [[Java (programming language)|Java]], [[C Sharp (programming language)|C#]], [[Scala (programming language)|Scala]], [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[OCaml]], C (starting from C23) and C++ can represent binary values by prefixing a number with <code>0B</code> or <code>0b</code>.