Is Left associativity only for Postfix expression?

问题:

In case of evaluation of postfix expression , is the associativity always left to right?. If yes, why? If no, why?

回答1:

Yes.

See this handy table of C's operators.

The postfix operators are:

• ++ and --
• () (function call)
• [] (array indexing)
• . (member select)
• -> (member select)

And they are all in the left-to-right precedence group (2) near the top of the table.

I guess the "why" is since that's how the language is defined. There are no "natural causes" for these kinds of things, they're human-made you know.