How many expr_no_commas '=' expr_no_commas expressions are there in C?

expr_no_commas '=' expr_no_commas

It's found in C's rule,but the only possible form I 开发者_StackOverflowcan think of is:

identifier = expr_no_commas

that is,the left side is a single variable,any other variants?

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There a lot of C expressions that are assignments to non-identifiers; here are a few examples:

x[1] = 5;
*f() = 7;
*p++ = 0;
a[i].f = a[i].g;

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Where did you find that "rule"? The syntax presented in the language standard (draft n1256, § 6.5.16) is

assignment-expression:
    conditional-expression
    unary-expression assignment-operator assignment-expression

assignment-operator: one of
    = *= /= %= += -= >= &= ^= |=

where unary-expression results in any number of productions that aren't simple identifiers (as Jeremiah Willcock has shown).