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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 a given problem without the programmer. 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 examples of fifth-generation languages.{{Citation needed|date=September 2010}}
These types of languages were also built upon Lisp, many originating on the [[Lisp machine]], such as [[ICAD]]. Then, there are many [[frame language]]s, such as [[KL-ONE]]. {{Citation needed|date=September 2010}}
In the 1990s, fifth-generation languages were considered to be the wave of the future, and some predicted that they would replace all other languages for system development, with the exception of low-level languages.{{Citation needed|date=July 2009}} Most notably, from 1982 to 1993 [[Japan]]<ref name="Ref1">{{Cite web|url=http://www.atariarchives.org/deli/fifth_generation.php|title=FIFTH-GENERATION COMPUTERS|accessdate=2008-03-05|author=Richard Grigonis}}</ref><ref name="Ref2">{{Cite web|url=http://www.cs.kuleuven.ac.be/~dtai/projects/ALP/|title=Association for Logic Programming (ALP)|accessdate=2008-03-05|author=ALP}}</ref> put much research and money into their [[fifth generation computer systems project]], hoping to design a massive computer network of machines using these tools.
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