On Tue, 18 Feb 2014, 林嘉(程二 福州) wrote:
> Thanks, So, what's the difference between 'statement' and 'expression'?
> I guess statement means a complete line in c code, such as 's =
> socket(...);' while expression means an incomplete part, e.g. right hand of
> operator, 'socket(inet, 0, 0, 0)' ?
A statement has no value. So like s = socket(...); but also if (...)
return;, etc.
An expression has a value. So like 3 + 4, f(), etc. x = y without a
trailing semicolon is also an expression.
There is a simple grammar for a C-like language here:
http://marvin.cs.uidaho.edu/Teaching/CS445/c-Grammar.pdf
This is not the grammar that we follow, but it can give the idea.
julia
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