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<li>if pointer ptr + 5, the location vary depending onb which CPU being used(16-bit, 32-bit, 64-bit).</li>
<li>a multi-D array like int x[3][4][2] contains 24 elements which locations range from 0 to 23. suppose ptr = x is a pointer, then &x[i][j][k] = pre + i*4*2 +j*2+k because i will be 0, 1, 2; j will be 0, 1, 2, 3; and k will be 0,1.</li>
<li>an array name without any indexing brackets is pointer to the beginning of an array, so y[i] = *(y+i).</li><li>pointer arithmetic runs from left to right.</li>
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