Difference Between One-Dimensional and Two-Dimensional Array

Difference Between One-Dimensional and Two-Dimensional Array

Here, we will see the Difference Between One-Dimensional and Two-Dimensional Array and then discuss the functionality of the One-Dimensional and Two-Dimensional Array individually, which are important for the GATE CSE exam. The table below shows the Difference Between One-Dimensional and Two-Dimensional Array based on the declaration, type, etc.

Key Differences Between One-Dimensional and Two-Dimensional Arrays

One-Dimensional Array	Two-Dimensional Array
Keep a single list of elements of the same data type in a one-dimensional array.	‘List of lists,’ array of arrays, or ‘array of one-dimensional arrays’ should be saved in the two-dimensional array.
/*declaration in C++ type variable_name[ size ];*/ /*declaration in Java type variable_name [ ]; variable_name = new type[size]; */	/*declaration in C++ type variable_name[size1][size2]; */ /*declaration in Java type variable_name= new int[size1][size2]; */
In one dimensional array, Total Bytes = sizeof(datatype of array variable) * array size.	In a two-dimensional array, Total Bytes= sizeof(array variable datatype)* size of first index* size of second index.
It can be received as a pointer, sized array, or unsized array.	The receiving parameter should define the array’s rightmost dimension.
The one-dimensional array is a list that represents multiple data items.	The two-dimensional array represents several data items in the form of a table with columns and rows.

What is a One-Dimensional Array?

The one-dimensional array comprises a list of variables with the same data type. The one-dimensional array has a fixed size. In C++, we can use a vector to create a dynamically sized array. Various problems can be formulated based on this concept of the One-Dimensional Array in the GATE question paper. One-dimensional Array is declared in C++ as:

Syntax of One-Dimensional Array

variable name[size] ;

The example of a one-dimensional array is as follows:

What is a Two-Dimensional Array?

A two-dimensional array comprises a collection of arrays with similar data types. Multi-dimensional Arrays are another name for two-dimensional arrays. A matrix is another name for a two-dimensional array which is important for the GATE exam.

A two-dimensional array is declared in C++ as follows:

Syntax of Two-Dimensional Array

type variable name[size1][size2];

All elements of a 2D array can be accessed both randomly and by index.

Important GATE Topics
And Gate Truth Table	Man Full Form
JK Flip Flop	Lan Full Form
JK Flip Flop Excitation Table	Propped Cantilever Beam
Job Sequencing With Deadlines	Torsional Force
Knapsack Problem Using Greedy Method	Pop Full Form