Function Definition Language FDL andIts Implementation

A Function Definition Language (FDL) is presented. Though de-signed for describing specifications, FDL is also a general-purpose functional pro-gramming language. It uses context-free language as data type, supports patternmatching definition of functions, offers several function definition forms, and is exe-cutable. It is shown that FDL has strong expressiveness, is easy to use and describesalgorithms concisely and naturally. An interpreter of FDL is introduced. Experi-ments and discussion are included.