Often there is a need to store and manipulate two dimensional data structure such as matrices & tables. Here the array has two subscripts. One subscript denotes the row & the other the column. It is referred as two dimensional array.
The declaration of two dimension arrays is as follows:
The declaration of two dimension arrays is as follows:
data_type array_name[row_size][column_size];
Here, data_type is any valid c data type. array_name specifies name of an array. First value in subscript is represent number of rows and second value represent number of column.
Ex int x[3][5];
Here x is declared as a matrix having 3 rows( numbered from 0 to 2) and 5 columns(numbered 0 through 4). The first element of the matrix is x[0][0] and the last row last column is x[2][4].
Column[0] | Column [1] | Column [2] | Column [3] | Column [4] | |
Row[0] | 1 [0][0] | 2 [0][1] | 3 [0][2] | 4 [0][3] | 5 [0][4] |
Row [1] | 11 [1][0] | 12 [1][1] | 13 [1][2] | 14 [1][3] | 15 [1][4] |
Row [2] | 21 [2][0] | 22 [2][1] | 23 [2][2] | 24 [2][3] | 25 [2][4] |
Ac
Ac
According to above representation of two dimensional array, the 3rd element of 1st row represented as x[0][2] and here its value is 3
Initialization of two dimensional array
è Similar to the one-dimensional the two-dimensional arrays are initialized.
Ex, int array[2][3] = {1,2,3,4,5,6};
In the above case elements of the first row are initialized to 1,2,3 & second row elements are initialized to 4,5,6.
1 | 2 | 3 |
4 | 5 | 6 |
è The initialization can be done row wise also.
Ex, int array[2][3] = {{1,2,3},{4,5,6}};
è If the initialization has some missing values then they are automatically initialized to 0.
Ex, int array[2][3] = {{3.4},{5}}
In this case the first two elements of the first row are initialized to 3,4 ,while the first element of the second row is initialized to 5 & rest all elements are initialized to 0.
3 | 4 | 0 |
5 | 0 | 0 |
Ex,
void main()
{
int i,j;
int mat[3][3];
printf(“\n Input \n” );
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf(“\n enter element [%d][%d] : “,i+1,j+1);
scanf(“%d”,&mat[i][j]);
}
}
printf(“\n output \n” );
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf(“%d”,mat[i][j]);
}
printf(“\n”);
}
}
Posted By : Ruchita Pandya
