C # supports multidimensional arrays. A multidimensional array is also called a rectangular array.
You can declare a string two-dimensional array of variables, as follows:
string [,] names; Alternatively, you can declare a int three-dimensional array of variables, as follows:
int [ , , ] m; 1.26.1. Two-dimensional array #
The simplest form of a multidimensional array is a two-dimensional array. A two-dimensional array is essentially a list of one-dimensional arrays.
A two-dimensional array can be thought of as a table with x rows and y columns.
Therefore, each element in the array is in the form of a[ i , j ] identified by the element name of the, where a is the array name i and j are subscripts that uniquely identify each element in a .
1.26.2. Initialize two-dimensional array #
Multidimensional arrays can be initialized by specifying values for each rowin parentheses. The following is an array with three rows and four columns.
int [,] a = new int [3,4] { {0, 1, 2, 3} , /* initialize rows with index number 0 */ {4, 5, 6, 7} , /* initialize rows with index number 1 */ {8, 9, 10, 11} /* initialize rows with index number 2 */ }; 1.26.3. Access two-dimensional array elements #
Elements in a two-dimensional array are accessed by using subscripts (that is, row and column indexes of the array). For example:
int val = a[2,3]; The above statement will get the fourth element in the third line of the array. You can verify it through the diagram above. Let’s take a look at thefollowing program, where we will use nested loops to deal with two-dimensional arrays: When the above code is compiled and executed, it produces the following results:Example #
using System; namespace ArrayApplication { class MyArray { static void Main(string[] args) { /* an array with 5 rows and 2 columns */ int[,] a = new int[5, 2] {{0,0}, {1,2}, {2,4}, {3,6}, {4,8} }; int i, j; /* output the values of each element in the array */ for (i = 0; i < 5; i++) { for (j = 0; j < 2; j++) { Console.WriteLine("a[{0},{1}] = {2}", i, j, a[i,j]); } } Console.ReadKey(); } } }
a[0,0]: 0 a[0,1]: 0 a[1,0]: 1 a[1,1]: 2 a[2,0]: 2 a[2,1]: 4 a[3,0]: 3 a[3,1]: 6 a[4,0]: 4 a[4,1]: 8