Two Dimensional Array

            TWO-DIMENSIONAL ARRAYS

Sometimes we need to store data in the form of rows & column (or matrix).

For example: there are 5 classes and in each class there are 60 students.

So we can use two-dimensional array. Yes! It is possible to initialize two-dimensional array.

Declaration of 2D array:

data_type  array_name[row_size][column_size] ;

int Marks[4][3];

Row/comlumn	Column 0	Column 1	Column 2
Row 0	Marks[0][0]	Marks[0][1]	Marks[0][2]
Row 1	Marks[1][0]	Marks[1][1]	Marks[1][2]
Row 2	Marks[2][0]	Marks[2][1]	Marks[2][2]
Row 3	Marks[3][0]	Marks[3][1]	Marks[3][2]

This was the representation of 2D array. But in the memory of the computer they are stored in some different manner (given below).

(0,0)      (0,1)         (0,2)         (1,0)      (1,1)       (1,2)        (2,0)       (2,1)         (2,2)         (3,0)       (3,1)        (3,2)

Initialization of Two-dimensional Arrays:

There are multiple ways to initialize a 2D array.

1)      Same as one dimensional array:

int marks[2][3]= {1,2,3,4,5,6};

2)      Initialize row by row:

int marks[2][3]={ {1,2,3},{4,5,6} };

3)      Initialize each element one by one:

Marks[0][0]=1;                  marks[0][1]=2;

Marks[0][2]=3;                  marks[1][0]=4;

Marks[1][1]=5;                  marks[1][2]=6;

4)      You can also leave the size at the time of initialization:

int marks[][3]={ {1,2,3},{4,5,6}};

5)      If you want to initialize all the members of the array:

int marks[2][3]={0};

6)      If some values are missing then it is automatically set to Zero:

int marks[2][3]={ {4,5,6} };