How does a parser for the infix notation detect the missing multiplication sign?

Question

I am writing a parser that parses mathematical expressions based on a syntax diagram very similar to this one.

I have not found a way to handle a missing multiplication sign (for example in 3(x+y)). Where in the syntax diagram do I have to handle this?

`3(x+y)` is not a valid expression in the grammar you link to. You could make `*` optional (implicit), if you like, but that's not how that grammar currently is. — 500 - Internal Server Error, Jul 25 '15 at 19:09
Instead of changing your question radically, ask a new question and include a link to the old one. — Ben Voigt, Jul 25 '15 at 21:41

melpomene · Accepted Answer · 2015-07-25T19:11:59.230

1

You'd make the * optional in the definition of term.

ASCII diagram:

o-->-->--[factor]->-->--o
    /               \
    \               /
     ---<--[*]--<---
         \     /
          --<--

edited Jul 25 '15 at 19:11

answered Jul 25 '15 at 19:06

melpomene

Ok. I understand this but please see my edits to the question since I wanted to ask something that is more related to the actual code. – HerpDerpington Jul 25 '15 at 20:27
1

@user1574054 That's a completely new question. I don't know C#, sorry. – melpomene Jul 25 '15 at 20:37

1 Answers1