Information Conflicts About Operator Precedence

Question

I've recently been reading Pointers on C book of Kenneth A. Reek. The book has a really nice table of C operators and their precedence levels. However, when I checked other resources to make sure information provided in the book is correct and up-to-date, I've seen there are varying information around. I'll provide precise examples to show what I exactly mean.

The book provides a table where the function call operator () has the highest precedence. Postfix increment and decrement operators are coming after. I've checked other resources to validate the information. I've checked this resource and this resource and this resource. The precedence information provided in these resources match with what is explained in Pointer on C book. Problem starts with precedence table in cppreference because it has different precedence rules than other resources.

So am I missing something?

Given that `()` is a postfix operator, its precedence with regard to postfix `++` and `--` is entirely irrelevant. The order of operators determines which is applied first. — EOF, May 09 '17 at 11:20
Postfix increment and decrement operators comes **before** function call operator in cppreference — nmd_07, May 09 '17 at 11:20
The boxes at cppreference indicate sets of operators with equal priority. — Oliver Charlesworth, May 09 '17 at 11:22
This might help you : https://blogs.msdn.microsoft.com/ericlippert/2008/05/23/precedence-vs-associativity-vs-order/ — haccks, May 09 '17 at 12:01

score 6 · Answer 1 · answered May 09 '17 at 11:23

As already mentioned in the linked resource

Operators that are in the same cell (there may be several rows of operators listed in a cell) are evaluated with the same precedence, in the given direction. For example, the expression a=b=c is parsed as a=(b=c), and not as (a=b)=c because of right-to-left associativity.

So, the written order of operators (with same precedence) in any article does not matter much, the associativity (as present in the actual statement to be evaluated) is important.

Information Conflicts About Operator Precedence

1 Answers1