November 2012
Intermediate to advanced
381 pages
13h 26m
English
book
Introduction to Compiler Construction in a Java World
by Bill Campbell, Swami Iyer, Bahar Akbal-Delibas
Content preview from Introduction to Compiler Construction in a Java World
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Parsing 69
If unambiguous grammars are so important, why do we see so many languages having
this ambiguous conditional statement? All of j--, Java, C, and C++ include precisely this
same ambiguous conditional construct. One could easily modify the syntax of conditionals
to remove the ambiguity. For example, the programming languages S-Algol and Algol-S
define conditionals so:
(3.14)
S ::= if E do S
| if E then S else S
| s
E ::= e
Here, the do indicates the simpler conditional (having no else clause) while the then
indicates the presence of an else clause. A simple solution but it does change the language.
But programmers have become both accustomed to
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