Talk:Operators in C and C++: Difference between revisions

Revision as of 09:21, 22 September 2019

Revision as of 18:48, 11 May 2020

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The explanation about parsing "e = a < d ? a++ : a = d" is incorrect. In C, it is not parsed as "(a < d ? a++ : a) = d" but just a syntax error; this is because the standard grammar for the assignment expression is

<sourcesyntaxhighlight lang="c">

unary-expression assignment-operator assignment-exression

</syntaxhighlight>

</source>

and the conditional expression cannot match to "unary-expression." Most compilers (especially with recursive-descent parsers) modify the grammar by replacing "unary-expression" with "conditional-expression" to avoid back-tracking or look-ahead or to handle errors gracefully, and thereof the syntactic error turns into a semantic one saying that the left operand of "=" or "op=" should be an lvalue. Which is why many people mistake the error for the semantic error. --[[User:Woong.jun|Woong.jun]] ([[User talk:Woong.jun|talk]]) 11:43, 15 March 2010 (UTC)

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For example:

<sourcesyntaxhighlight lang="c">

void foo (int count)

{

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//Now do something here.

}

</syntaxhighlight>

</source>

== Notes ==