Discussion
What would be the equivalent pointer expression for referring the array element a[i][j][k][l]
Answer: B
Correct answer: *(*(*(*(a+i)+j)+k)+l)
Each subscript is defined as a dereference of a sum: x[y] means *(x+y). Applying that rule four times, from the outside in, gives one dereference for every subscript.
\[ a[i][j][k][l] \equiv *(*(*(*(a+i)+j)+k)+l) \]
The options without the asterisks compute addresses but never read through them. Note that the pointer arithmetic is scaled by the size of the sub-array at each level, which is why the array's dimensions must be known to the compiler.
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