LR(1) - Classes

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Quiz #9

• Convince yourself (and me) that the ambiguous

grammar for expressions is not LR(1).

E –> E + E

| E * E

| (E)

| id

• Is the following grammar LR(1)? Is it LALR(1)?

S –> Aa | bAc | Bc | bBa

A –> d

B –> d

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Quiz #9 • Convince yourself (and me) that the ambiguous grammar for expressions is not LR(1). E –> E + E | E * E | (E) | id • Is the following grammar LR(1)? Is it LALR(1)? S –> Aa | bAc | Bc | bBa A –> d B –> d 18

Page 1 and 2: CS480 Translators LALR(1) Parsing/A
Page 3 and 4: LR(1) Parse Table… Stack i ; else
Page 6 and 7: LALR(1) Parse Table/Brute Force 6
Page 8 and 9: LALR Parse Table… Stack i ; else
Page 10 and 11: LALR Table Construction • Merge a
Page 12 and 13: What happens in I 7 and I 8 ? 12
Page 14 and 15: “Dangling-Else” Resolution
Page 16 and 17: How does it work…

LR(1) - Classes

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