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Lex&Yacc 的結合

Lex&Yacc 的結合. 範例 : 實作一個簡易的 compile 執行環境 & 工具 Windows XP: Flex 、 Bison 、 VC++ Fedora 4 linux: lex 、 Bison 、 cc 檔案說明 : Lex source file: lexl.l yacc file: yacca.y 自定義標頭檔 :lexa.h. YACC File. yacc declarations. Grammar rules. Grammar rules. Additional C code. LEX File. Definitions.

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Lex&Yacc 的結合

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  1. Lex&Yacc的結合 • 範例:實作一個簡易的compile • 執行環境&工具 • Windows XP: Flex、Bison、VC++ • Fedora 4 linux: lex 、Bison、cc • 檔案說明: • Lex source file: lexl.l • yacc file: yacca.y • 自定義標頭檔:lexa.h

  2. YACC File

  3. yacc declarations

  4. Grammar rules

  5. Grammar rules

  6. Additional C code

  7. LEX File

  8. Definitions

  9. Transition rules

  10. 執行結果 實作加法運算 輸出個是為double型態 實作除法運算 當除數為0,輸出divide by zero

  11. 參考資料 • lex & yacc, 2/E書名：lex & yacc 中譯本（修訂版）作者：John R. Levine, Tony Mason & Doug Brown

  12. ~END~

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