4.1.3 TWO-DIMENSIONAL ARRAY

Def:

The two-dimensional array is generally called a matrix.

Horizontal arrangement of elements is called row and vertical arrangement of elements is called column.

Memory Layout:

The elements of all arrays are stored contiguously in increasing memory locations, essentially in a single list.

  

Declaration of two-dimensional arrays

General form:

            type   array_name[row_size] [column_size];

The type specifies the type of element that will be contained in the array, the row_size indicates the maximum number of rows of the matrix and column_size indicates the maximum number of columns in the matrix.

e.g.      int attd[50][30];

           

Initialization of two-dimensional array

§  Compile-time Initialization

e.g.      float     total[2][3] = { 0, 0, 0, 1, 1, 1};

 

§  Run-time Initialization

e.g.      int   num[10][10];

for ( i = 0; i <= 10; i++)

                        {

           for ( j = 0; j <= 10; j++)

            {

                        scanf ( “%d”, &num[i][j]);

                        }

            }