Syntax

Example:

<digit> ::= 0 | 1 | 2 | 3| 4 | 5 | 6 | 7 | 8 | 9 |

<operator> ::= + | - | * | /

<numeral> ::= <digit> | <digit><numeral>

<expression> ::= <numeral> | (<expression> | <expression><operator> <expression>

The structure of an expression is illustrated by its derivation tree

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