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In type theory, a typing rule is an inference rule that describes how a type system assigns a type to a syntactic construction. [1]: 94 These rules may be applied by the type system to determine if a program is well-typed and what type expressions have.
Person typing on a laptop keyboard Video of typing on a notebook computer keyboard. Typing is the process of writing or inputting text by pressing keys on a typewriter, computer keyboard, mobile phone, or calculator. It can be distinguished from other means of text input, such as handwriting and speech recognition. Text can be in the form of ...
For this reason, writers who wish to write unambiguously about type systems often eschew the terms "strong typing" and "weak typing" in favor of specific expressions such as "type safety". Generally, a strongly typed language has stricter typing rules at compile time, which implies that errors are more likely to happen during compilation. Most ...
Competitive typist Albert Tangora demonstrating his typing in 1938. Touch typing (also called blind typing, or touch keyboarding) is a style of typing.Although the phrase refers to typing without using the sense of sight to find the keys—specifically, a touch typist will know their location on the keyboard through muscle memory—the term is often used to refer to a specific form of touch ...
The process of verifying and enforcing the constraints of types—type checking—may occur at compile time (a static check) or at run-time (a dynamic check). If a language specification requires its typing rules strongly, more or less allowing only those automatic type conversions that do not lose information, one can refer to the process as strongly typed; if not, as weakly typed.
Sentence spacing concerns how spaces are inserted between sentences in typeset text and is a matter of typographical convention. [1] Since the introduction of movable-type printing in Europe, various sentence spacing conventions have been used in languages with a Latin alphabet. [2]
The idea is to only use one hand (preferably the left one) and type the right-hand letters by holding a key which acts as a modifier key.The layout is mirrored, so the use of the muscle memory of the other hand is possible, which greatly reduces the amount of time needed to learn the layout, if the person previously used both hands to type.
The amendment 1 of ISO/IEC 9995-2:2009, which was published in 2012, specifies two ways of the emulation of a numeric keypad within the alphanumeric section of a keyboard. One way, with mappings to keys in the left half of the alphanumeric section (shown green in the diagram above), emulates a numeric keypad with the digits 1,2,3 in the upper row.