Editing Tilde (section)

=====Negation=====

In [[APL (programming language)|APL]]<ref name="j303">{{cite web |title=APL2 Programming: Language Reference |publisher=[[IBM]] |url=https://www.ibm.com/downloads/cas/ZOKMYKOY |date=February 1994 |edition=2nd |access-date=2024-10-22}}</ref>{{rp|68}} and [[MATLAB]],<ref>{{cite web |title=MATLAB Operators and Special Characters - MATLAB & Simulink |website=MathWorks |url=https://www.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html |access-date=2024-10-22}}</ref> tilde represents the monadic logical function NOT. and in APL it additionally represents the dyadic [[multiset]] function ''without'' ([[Complement (set theory)#Relative complement|set difference]]).<ref name="j303"/>{{rp|258}}

In [[C (programming language)|C]] the tilde character is used as [[bitwise NOT]] unary [[Operators in C and C++|operator]], following the notation in logic (an <code>!</code> causes a logical NOT, instead).<ref>{{cite web |title=Programming languages — C |url=https://files.lhmouse.com/standards/ISO%20C%20N2176.pdf |author=ISO/IEC |access-date=2024-10-19 |page=64 }}</ref> This is also used by many languages based on or influenced by C, such as [[C++]], [[C Sharp (programming language)|C#]], [[D programming language|D]], [[Java (programming language)|Java]], [[JavaScript]], [[Perl]], [[PHP]], and [[Python (programming language)|Python]].<ref name="rigaux">{{Cite web |title=syntax across languages (One Big Page) |url=https://rigaux.org/language-study/syntax-across-languages.html |access-date=2024-11-28 |website=rigaux.org |archive-url=https://web.archive.org/web/20240823220158/http://rigaux.org/language-study/syntax-across-languages.html |archive-date=2024-08-23}}</ref> The [[MySQL|MySQL database]] also use tilde as bitwise invert<ref>{{Cite web|url=https://dev.mysql.com/doc/refman/8.0/en/bit-functions.html#operator_bitwise-invert|title=MySQL :: Reference Manual :: Bit Functions and Operators|website=dev.mysql.com|access-date=2019-12-20}}</ref> as does Microsoft's SQL Server [[Transact-SQL|Transact-SQL (T-SQL)]] language.

======~~ cast======
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[[JavaScript]] also uses tilde as bitwise NOT. Because bitwise operators work on integers, and numbers in JavaScript are 64 bit floating point numbers, the operator converts numbers to a 32-bit signed integer before it performing the negation.<ref>{{Cite web |title=JavaScript Bitwise Operations |url=https://www.w3schools.com/js/js_bitwise.asp |access-date=2024-11-28 |website=W3Schools |language=en-US |archive-url=https://web.archive.org/web/20241128173553/https://www.w3schools.com/js/js_bitwise.asp |archive-date=2024-11-28}}</ref> The conversion truncates the fractional part and most significant bits. This lets two tildes <code>~~x</code> to be used as a short syntax to cast to integer. However, it is not recommended as use for truncation. In contrast, it does not truncate BigInts, which are arbitrarily large integers.<ref>{{Cite web |date=2023-08-15 |title=Bitwise NOT (~) - JavaScript |url=https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT |access-date=2024-11-28 |website=MDN |language=en-US |archive-url=https://web.archive.org/web/20241128173342/https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT |archive-date=2024-11-28}}</ref>