Interpretation of Subscript Operator
Like other operators, the subscript operator ([ ]) can be redefined by the user. The default behavior of the subscript operator, if not overloaded, is to combine the array name and the subscript using the following method:
*((array-name) + (subscript))
As in all addition that involves pointer types, scaling is performed automatically to adjust for the size of the type. Therefore, the resultant value is not subscript bytes from the origin of array-name; rather, it is the subscriptth element of the array. (For more information about this conversion, see Additive Operators.)
Similarly, for multidimensional arrays, the address is derived using the following method:
((array-name) + (subscript1 max2 * max3*...maxn) + subscript2 * max3...max*n) . . . + subscriptn))