Space Complexity:O(1) How 2D Arrays are Stored in the Memory? Time Complexity: O(N*M), where N(here 3) and M(here 2) are numbers of rows and columns respectively. The below example demonstrates the row-major traversal of a 2D array. The order of traversal can be row-major order or column-major order depending upon the requirement. One to traverse the rows and another to traverse columns.įor printing the whole array, we access each element one by one using loops. To output all the elements of a Two-Dimensional array we can use nested for loops. Therefore, for row index 2 row number is 2+1 = 3. Note: In arrays, if the size of an array is N. The above example represents the element present in the third row and second column. Each element in a 2D array can be referred to by: Accessing Elements of Two-Dimensional Arrays in CĮlements in 2D arrays are accessed using row indexes and column indexes. This method is useful when the values of each element have some sequential relation. We can use any C loop to initialize each member of a 2D array one by one as shown in the below example. Note: The number of elements in initializer list should always be less than or equal to the total number of elements in the array. The advantage of this method is that it is easier to understand. In the above example, there is a total of three rows so there are three sets of inner braces. Each set of inner braces represents one row. This type of initialization makes use of nested braces. We can initialize a 2D array in C by using an initializer list as shown in the example below.įirst Method: int x = Initialization of 2D array using Initializer List The various ways in which a 2D array can be initialized are as follows:ġ. Initialization of Two-Dimensional Arrays in C We can also create an array dynamically in C by using methods mentioned here. Note: In this type of declaration, the array is allocated memory in the stack and the size of the array should be known at the compile time i.e. Software Engineering Interview Questions.
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