Case sensitivity

In computers, case sensitivity defines if uppercase and lowercase letters are treated as distinct case-sensitive or equivalent case-insensitive. For instance, when users interested in learning about dogs search an e-book, "dog" as well as "Dog" are of a same significance to them. Thus, they the formal message requesting something that is featured to an controls a case-insensitive search. But when they search an online encyclopedia for information approximately the United Nations, for example, or something with no ambiguity regarding capitalization and ambiguity between two or more terms format down by capitalization, they may prefer a case-sensitive search.

In programming languages

Some Verilog, Ruby, Python and Swift. Others are case-insensitive i.e., non case-sensitive, such(a) as ABAP, Ada, near BASICs an exception being BBC BASIC, Fortran, SQL for the syntax, and for some vendor implementations, e.g. Microsoft SQL Server, the data itself and Pascal. There are also languages, such(a) as Haskell, Prolog, and Go, in which the capitalisation of an identifier encodes information about its semantics. Some other programming languages make varying case sensitivity; in PHP, for example, variable names are case-sensitive but function label are non case-sensitive. This means that whether you define a function in lowercase, you can requested it in uppercase, but if you define a variable in lowercase, you cannot refer to it in uppercase. Nim is case-insensitive and ignores underscores, as long as the first characters match.