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A '''fifth-generation programming language''' (abbreviated '''5GL''') is a [[programming language]] based around solving problems using [[Constraint programming|constraints]] given to the program, rather than using an [[algorithm]] written by a programmer. Most constraint-based and [[logic programming]] languages and some declarative languages are fifth-generation languages.
While [[fourth-generation programming language]]s are designed to build specific programs, fifth-generation languages are designed to make the computer solve the problem for you. This way, the programmer only needs to worry about what problems need to be solved and what conditions need to be met, without worrying about how to implement a routine or algorithm to solve them. Fifth-generation languages are used mainly in [[artificial intelligence]] research. [[Prolog]], [[OPS5]], and [[Mercury programming language|Mercury]] are the best known fifth-generation languages.
These types of languages were also built upon Lisp, many originating on the [[Lisp machine]]. [[ICAD]] is a good example. Then, there are many [[frame language]]s, such as [[KL-ONE]].
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