Equation parser

我要寫一個parser去parse條Equation eg:(9+6)*5 =?咁
我要check個equation係咪vaild eg:開關括號,opreator岩唔岩
唔知有冇類似既野同Doc參考下?
Thanks

0

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發表於 2008-10-29 09:29 | 只看該作者

原帖由 W君於 2008-10-29 08:56 發表
我要寫一個parser去parse條Equation eg:(9+6)*5 =?咁
我要check個equation係咪vaild eg:開關括號,opreator岩唔岩
唔知有冇類似既野同Doc參考下?
Thanks

google "lexical analysis", "context free grammar", "recursive descent parser" 等等.
如果但求有得用, 唔係交功課, 就google "lex", "yacc", "antlr"...

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發表於 2008-10-29 19:54 | 只看該作者

use flex and bison...
岩岩讀緊