CS235102 Data Structures Chapter 2 Arrays and Structures.

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CS Data Structures Chapter 2 Arrays and Structures

2.5 Representation of multidimensional array (1/5)  The internal representation of multidimensional arrays requires more complex addressing formula.  If an array is declared a[upper 0 ][upper 1 ]…[upper n ], then it is easy to see that the number of elements in the array is: Where  is the product of the upper i ’s. Where  is the product of the upper i ’s.  Example:  If we declare a as a[10][10][10], then we require 10*10*10 = 1000 units of storage to hold the array.

2.5 Representation of multidimensional array (2/5)  Represent multidimensional arrays: row major order and column major order.  Row major order stores multidimensional arrays by rows.  A[upper 0 ][upper 1 ] as upper 0 rows, row 0, row 1, …, row upper0-1, each row containing upper1 elements.

2.5 Representation of multidimensional array (3/5)   Row major order:A[i][j] :  + i*upper 1 + j   Column major order:A[i][j] :  + j*upper 0 + i col 0 col 1 col u1-1 row 0 A[0][0]A[0][1]...A[0][u1-1]  + u 0  +(u 1 -1)* u 0 row 1 A[1][0]A[1][1]...A[1][u1-1]  + u 1... row u0-1 A[u0-1][0]A[u0-1][1]...A[u0-1][u1-1]  +(u 0 -1)*u 1

2.5 Representation of multidimensional array (4/5)  To represent a three-dimensional array, A[upper 0 ][upper 1 ][upper 2 ], we interpret the array as upper 0 two-dimensional arrays of dimension upper 1  upper 2.  To locate a[i][j][k], we first obtain  + i*upper 1 * upper 2 as the address of a[i][0][0] because there are i two dimensional arrays of size upper 1 *upper 2 preceding this element.   + i*upper 1 *upper 2 +j *upper 2 +k as the address of a[i][j][k]. as the address of a[i][j][k].

2.5 Representation of multidimensional array (5/5)  Generalizing on the preceding discussion, we can obtain the addressing formula for any element A[i 0 ][i 1 ]…[i n-1 ] in an n-dimensional array declared as: A[upper 0 ][upper 1 ]…[upper n-1 ]   The address for A[i 0 ][i 1 ]…[i n-1 ] is: