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The syntax of expressions specifies operator precedences according to four classes of operators. The not-operator ~ has the highest binding strength, followed by multiplication operators, addition operators, and finally relations. Operators of the same binding strength associate from left to right. For example, x-y-z stands for (x-y)-z.
expr ::= simple_expr relation
simple_expr ::= simple_expr simple_expr ::= simple_expr add_operator term ::= term ::= unary term term ::= term mul_operator factor ::= factor factor ::= <character> ::= <integer> ::= <real> ::= <string> ::= set ::= designator ::= func_designator actual_parameters ::= ( expr ) ::= ~ factor set ::= { elem_list } ::= { } elem_list ::= elem_list , elem ::= elem elem ::= elem_expr .. elem_expr ::= elem_expr elem_expr ::= expr func_designator ::= designator
relation ::= =
add_operator ::= +
mul_operator ::= *
unary ::= + |
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Canterbury Oberon-2 for JVM (Last documentation update
Jun 2, 2000)
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