3. BNF example 2


Some of the BNF notation include:

 < > used to enclose a syntactic item 
 ::= means "is defined by" or "consists of"
 | when placed between two items means an OR choice between them
 { } curly brackets means zero or more repetitions of the content. 

Example 2 Defining a digit

Backus-Naur Form BNF example 2

So a digit is any number between zero and nine


Challenge see if you can find out one extra fact on this topic that we haven't already told you

Click on this link: using BNF


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