In C++ you can define multidimensional arrays with any number of dimensions. The
ANSI standard stipulates a minimum of 256 dimensions but the total number of dimensions is in fact limited by the amount of memory available.

The most common multidimensional array type is that the two-dimensional array, the so called matrix.

C++ doesn’t need any special syntax to define multidimensional arrays. On the contrary, an n-dimensional array is not any different than an array with just one dimension
whose elements are (n–1)-dimensional arrays.

Each of these elements is a float array with a size of 10, which in turn forms the rows of
the two-dimensional array, number.

This means that the same rules apply to multidimensional arrays as to one-dimensional arrays. The initialization list of a two-dimensional array thus contains the values of
the array elements, that is, the one-dimensional rows.

Arrays can have more than one dimension. The declaration for a two-dimensional array is:

type variable[size1] [size2]; // comment


// a typical matrix
int matrix[2][4];

That C++ does not follow the notation used in other languages of matrix [10,12].
To access an element of the matrix we use the notation:

matrix[l][2] = 10;

C++ allows you to use as many dimensions as needed (only limited by the amount of memory available). Additional dimensions can be tacked on.


Initializing multidimensional arrays is similar to initializing single-dimension arrays. A set
of curly braces {} encloses each element. The declaration:

// a typical matrix
int matrix[2][4];

can be thought of as a declaration of an array of dimension 2 whose elements are arrays of
dimension 4. This array is initialized as follows:

// a typical matrix
int matrix[2][4] =
{1, 2, 3, 4},
{10, 20, 30, 40}

This is shorthand for:

matrix[0][0] = 1;
matrix[0][1] = 2;
matrix[0][2] = 3;
matrix[0][3] = 4;
matrix[1][0] = 10;
matrix[1][1] = 20;
matrix[1][2] = 30;
matrix[1][3] = 40;

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