Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value. To create an array, define the data type (like int) and specify the name of the array followed by square brackets [].
We can only store data of a certain type in an array that is defined for that type. int array can store int values only.
int myNumbers[] = {1,2,3,4,5,6};
To access an array element, refer to its index number.
int myNumbers[] = {25, 50, 75, 100};
printf("%d", myNumbers[0]);
// Outputs 25
Changing value can be done using the index number
myNumbers[0] = 33;
We can define the size of an array to store a specific number of values.
// Declare an array of four integers:
int myNumbers[4];
// Add elements
myNumbers[0] = 25;
myNumbers[1] = 50;
myNumbers[2] = 75;
myNumbers[3] = 100;
A multidimensional array is basically an array of arrays.
A 2D array is also known as a matrix (a table of rows and columns). To create a 2D array of integers,
int matrix[2][3] = { {1, 4, 2}, {3, 6, 8} };
// 2D array
1 4 2
3 6 8
To access an array element, refer to its array index and element index
int matrix[2][3] = { {1, 4, 2}, {3, 6, 8} };
// access the first value of the first array in the matrix.
matrix[0][0] = 9;