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  2. Help:Cite errors/Cite error references duplicate key - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors/Cite...

    If two or more calls to {{}} use the same citation parameters, that is, if the author(s), year, and page number(s) are all identical, but there is some other difference, such as a use of pp= vs p=, or a use of ps= in one but not the other, this issue will arise.

  3. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

  4. Associative array - Wikipedia

    en.wikipedia.org/wiki/Associative_array

    The basic definition of a dictionary does not mandate an order. To guarantee a fixed order of enumeration, ordered versions of the associative array are often used. There are two senses of an ordered dictionary: The order of enumeration is always deterministic for a given set of keys by sorting.

  5. Association list - Wikipedia

    en.wikipedia.org/wiki/Association_list

    It is also possible to delete a key from an association list, by scanning the list to find each occurrence of the key and splicing the nodes containing the key out of the list. [1] The scan should continue to the end of the list, even when the key is found, in case the same key may have been inserted multiple times.

  6. Literal (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Literal_(computer_programming)

    In computer science, a literal is a textual representation (notation) of a value as it is written in source code. [1] [2] Almost all programming languages have notations for atomic values such as integers, floating-point numbers, and strings, and usually for Booleans and characters; some also have notations for elements of enumerated types and compound values such as arrays, records, and objects.

  7. Referential integrity - Wikipedia

    en.wikipedia.org/wiki/Referential_integrity

    An example of a database that has not enforced referential integrity. In this example, there is a foreign key (artist_id) value in the album table that references a non-existent artist — in other words there is a foreign key value with no corresponding primary key value in the referenced table.

  8. Lexical analysis - Wikipedia

    en.wikipedia.org/wiki/Lexical_analysis

    Examples of common tokens Token name (Lexical category) Explanation Sample token values identifier: Names assigned by the programmer. x, color, UP: keyword: Reserved words of the language. if, while, return: separator/punctuator: Punctuation characters and paired delimiters.}, (, ; operator: Symbols that operate on arguments and produce results ...

  9. Character literal - Wikipedia

    en.wikipedia.org/wiki/Character_literal

    A character literal is a type of literal in programming for the representation of a single character's value within the source code of a computer program. Languages that have a dedicated character data type generally include character literals; these include C , C++ , Java , [ 1 ] and Visual Basic . [ 2 ]