Amazon Interview Question

Country: India

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of 1 vote

Either order is fine. It is just a matter of design. C followed row-major order.

For example Fortran uses column major order, meaning contiguous elements are stored column by column.

[1 2 3]
[4 5 6]

R major - 1 2 3 4 5 6
C major - 1 4 2 5 3 6

However, the following are key points,

1. The compiler designer should keep in mind the order and calculate offset accordingly.
2. Accessing contiguous elements is faster than accessing displaced elements due to cache.
3. Semantics of passing multidimensional arrays will change.

- Anonymous January 02, 2013 | Flag Reply
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of 0 vote

From the C99 Standard. Array subscripting
One of the expressions shall have type ‘‘pointer to object type’’, the other expression shall
have integer type, and the result has type ‘‘type’’.
2 A postfix 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).
3 Successive subscript operators designate an element of a multidimensional array object.
 If E is an n-dimensional array (n ≥ 2) with dimensions i × j × . . . × k, then E (used as
     other than an lvalue) is converted to a pointer to an (n − 1)-dimensional array with
      dimensions j × . . . × k. If the unary * operator is applied to this pointer explicitly, or
       implicitly as a result of subscripting, the result is the pointed-to (n − 1)-dimensional array,
        which itself is converted into a pointer if used as other than an lvalue. It follows from this
       that arrays are stored in row-major order (last subscript varies fastest).

- Anonymous January 02, 2013 | Flag Reply
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- Anonymous January 02, 2013 | Flag
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of 0 vote

bcz c is structured lanuage,it does not support fortran order(reverse order).................

- bhanu praksh chella January 03, 2013 | Flag Reply

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