Array of arrays

Declared by use of two or more sequential [square brackets]:

data type array Name[array size 1] [array size 2] ;

Akin to N rows & columns in a spreadsheet:

int myMultiArray[ 3 ] [ 4 ] ;  //declares a  two dimensional array called myMultiArray that contains 6 elements; e.g. in 3 rows / 4 columns

Defined by assiging values, separated by a comma, within {curly braces} for each dimension:

int myMultiArray[ 3 ] [ 4 ] = { { 0, 1, 2, 3 }, { 4, 5, 6, 7 }, { 8, 9, 10, 11 } } ; //same as:

int myMultiArray[ 3 ] [ 4 ] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 } ; //no need for nested curly braces

Single values can be defined by assigning the value to the specific element number, starting from zero for each dimension!

myMultiArray[ 2 ] [ 2 ] = 42 ; //sets the element in row 2, column 2 to 42

Specific elements can be accessed by assigning an array element to a variable

int myVar = myArray[ 1 ] [ 3 ] ; //assigns myVar with the element  contained in row 1, column 3

#include <stdio.h>

int main()
{
	int myMultiArray[ 3 ] [ 4 ] = { { 0, 1, 2, 3 }, { 4, 5, 6, 7 }, { 8, 9, 10, 11 } } ;

	printf("Element [2][2] is: %dn", myMultiArray[2][2]) ;

	myMultiArray[ 2 ] [ 2 ] = 42 ;

	printf("Element [2][2] is now: %dn", myMultiArray[2][2]) ;

	int myVar = myMultiArray[2][2] ;

	printf("myVar has now been assigned the [2][2] element: %dn", myVar) ;

	return 0;
}

Compile & run: