Lect 1.2 Lang Specification_stud_supp

Lect 1.2 Lang Specification_stud_supp - CPE425/CSC301/SC433...

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CPE425/CSC301/SC433 Programming Languages Lecture 1.2 Language Specification (supplements)
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Language Specification 2 Left – Right Recursive Left - recursive <expression>::= [<expression> <addoperator>] <term> Right - recursive <expression>::= < term >[<addoperator> < expression >] What is the Derivation Tree for 8 – 4 – 2 ? ¾ Left – recursive => left - associative ¾ Right – recursive => right - associative
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Language Specification 3 Using Left Recursive Calculator Grammar 2 ¾ 8 – 4 – 2 = ? 8 4 2 = digit addoperator digit addoperator digit unsigned unsigned unsigned value value value term term term expression expression expression ? <expression>::= [<expression> <addoperator>] <term> ( )
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Language Specification 4 Left – Recursive using Calculator Grammar 2 ¾ 8 – 4 – 2 = ? 8 4 2 = digit addoperator digit addoperator digit unsigned unsigned unsigned value value value term term term expression expression expression calculation <expression>::= [<expression> <addoperator>] <term> ( )
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Language Specification 5 Right – Recursive using Calculator Grammar 2 ¾ 8 – 4 – 2 = ? 8 4 2 = digit addoperator digit addoperator digit unsigned unsigned unsigned
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