C - 2D Array

 Two dimensional arrays :

Two dimensional array is known as matrix. The array declaration in both the array i.e.in single dimensional array single subscript is used and in two dimensional array two subscripts are is used. 

Its syntax is 

Data-type array name[row][column]; 

Or we can say 2-d array is a collection of 1-D array placed one below the other.

Total no. of elements in 2-D array is calculated as row*column 

Example:- 

 int a[2][3]; 

 Total no of elements=row*column is 2*3 =6 

It means the matrix consist of 2 rows and 3 columns 

For example:- 

 20        2        7 

  8         3       15 

Positions of 2-D array elements in an array are as below 

00       01       02 

10       11       12 

Accessing 2-d array /processing 2-d arrays 

For processing 2-d array, we use two nested for loops. The outer for loop corresponds to the row and the inner for loop corresponds to the column. 

For example 

int a[4][5]; 

for reading value:-

for(i=0;i<4;i++) 

{ 

for(j=0;j<5;j++) 

{ 

scanf(“%d”,&a[i][j]); 

} 

} 

For displaying value:- 

for(i=0;i<4;i++) 

{ 

for(j=0;j<5;j++) 

{ 

printf(“%d”,a[i][j]); 

} 

}