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Need sample java code

S Srikanth

Joined: Sep 09, 2002
Posts: 14
I have a scenario as follows.

I have a formula say F1+F2+F3.
F1 = B1+B2
F2 = F6+B3
F3 = B4
F6 = F7+B5
F7 = B6

After substitution of these values my formula becomes B1+B2+B3+B4+B5+B6.

Like this there can be multiple levels of substitution. How to handle these kind of situations in a java program.

In Brief,
I need to write a java function which takes F1+F2+F3 as input and which gives B1+B2+B3+B4+B5+B6 as output.

Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

Briefly, you need a parser which parses expressions into a tree structure, then evaluates/simplifies the tree, and then prints (or otherwise reports) the tree. The details are covered in any introductory book on compiler or parser writing, or the help docs for many "compiler-compilers" like ANTLR.

[Jess in Action][AskingGoodQuestions]
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