Arrays - August 22, 2008 at 13:10 PM by Rajmeet Ghai
What are Arrays?
Answer
An array is a series of elements. These elements are of the same type. Each
element can be individually accessed using an index. For e.g an array of
integers. Array elements are stored one after another (contiguous) in the
memory. An array can have more than one dimension. First element in an array
starts with 0.
Explain two-dimensional array.
Answer
An array with two dimensions is called as a two-dimensional array. It is also
called as a matrix. In C, a two dimensional array is initialized as int
arr[nb_of_rows] [nb_of_columns]. Hence, two dimensional arrays can be
considered as a grid. An element in a two dimensional can be accessed by
mentioning its row and column. If the array has 20 integer values, it will
occupy 80 bytes in memory (assuming 4 bytes for an integer). All of the bytes
are in consecutive memory locations, the first row occupying the first 20
bytes, the second the next 20, and so on.
Define Array of pointers.
Answer
An array of pointers is an array consisting of pointers. Here, each pointer
points to a row of the matrix or an element. E.g char *array [] = {“a”, “b”}.
This is an array of pointers to to characters.
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