![Is `index[array]` a Valid Array Access Syntax in C and C ?](https://img.php.cn/upload/article/000/000/000/173245652745327.jpg)
C ? C?? ???[array]? ?? ???
?? ???? ???? ??? array[index]??? C? C? ?? ??? ?????. ???[??]. ? ??? ?? ??????? ???? ????? ?? ??? ?? ??????
??:
int arr[] = {1, 2, 3};
2[arr] = 5; // Does this compile?
assert(arr[2] == 5); // Does this assertion fail?
??:
? ?? ??? ?? ??? ?????. ??. index[array] ??? *(index array)? ????, ??? ?? ????? 2[arr]? arr[2]? ????? ??? ? ????. ??? ?? ?? ??? ????? ???? ?? ????.
??:
?, C ? C ??? ?? ??? ?????.
C99 (6.5.2.1, ?? 1):
One of the expressions shall have type "pointer to object type", the other expression shall have integer type, and the result has type "type".
C99(6.5.2.1, ?? 2):
A post?x expression followed by an expression in square brackets [] is a subscripted designation of an element of an array object. The definition of the subscript operator [] is that E1[E2] is identical to (*((E1)+(E2))). Because of the conversion rules that apply to the binary + operator, if E1 is an array object (equivalently, a pointer to the initial element of an array object) and E2 is an integer, E1[E2] designates the E2-th element of E1 (counting from zero).
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