January 2017
Intermediate to advanced
314 pages
6h 42m
English
Content preview from .NET Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The grammar of expressions
The Backus-Naur Form (BNF) notation is used to specify the grammar for programming languages. The semantics of BNF can be learned from books, and plenty of material is available. The grammar of the expression evaluator we use is as follows:
<Expr> ::= <Term> | Term { + | - } <Expr>
<Term> ::= <Factor> | <Factor> {*|/} <Term>
<Factor>::= <number> | ( <expr> ) | {+|-} <factor> |
SIN(<expr>) | COS(<expr>) | $t
This BNF can be converted to source code very easily.
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