Wide-spectrum Language
A wide-spectrum language (WSL) is a programming language designed to be simultaneously a low-level and a high-level language—possibly a non-executable specification language. Wide-spectrum languages are designed to support a programming methodology based on program refinement. The concept was introduced by F. L. Bauer ''et al.'' in 1978: ...The program should then be developed step by step applying correctness preserving transformations.... The development process thus involves usually multiple reshapings.... Since most current programming languages do not contain all the concepts needed for the formulation of the different versions, the programmer is nowadays forced to use different languages. To avoid the transition from one language to another, it seems appropriate to have one coherent language frame covering the whole spectrum outlined above, i.e. a ''wide spectrum language''.Bauer, p. 15 The advantage of a single language rather than separate specification, high-le ...
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Programming Language
A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they may also be graphical. They are a kind of computer language. The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning), which are usually defined by a formal language. Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard) while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common. Programming language theory is the subfield of computer science that studies the design, implementation, analysis, characterization, and classification of programming languages. Definitions There are many considerations when defini ...
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