What you asked for...
Code:
array1 = 3;
array2 = (array1 + 6); // array2 = 3 + 6 == 9
array3 = (array2 + 4); // array3 = 9 + 4 == 13
All you did there was declare some variables and assign some values. If you want to access the memory buffer, you've got to use the square braces. It's not clear what you were expecting.