# C++ Multidimensional Arrays – 2D Arrays

In this Tutorial we will learn an understand the concept and working of multidimensional arrays in C++. We will be specifically concentrating of 2-D arrays in C++ for simplicity. If you don’t know the concept of Arrays in C++ you can check it here.

Multidimensional arrays in C++ can be considered as Array of Arrays, which simple means one array inside another.
General Declaration Syntax:

Here’s an Example of a 3-D Array declaration:

##### Two-Dimensional Arrays

2-D Arrays in C++ are the Simplest form of multidimensional arrays. A 2 dimensional array can be visualized as a table with rows and columns. Thus a matrix like structure can be formed.

Diagram of 2-D Array

Every element in array a is identified by an element name of the form Arr[ i ][ j ] where Arr is the name of the array, and i and j are the subscripts that uniquely identify each element in Arr.

##### Initializing 2-D Arrays

There are 2 ways to initialize multidimensional 2-D arrays. They are as follows:
Method 1:

Method 2:

To Initialize on element at a time you can do as follows:

##### Accessing 2-D Array Elements

An element in the 2-D array can be accessed by using the unique row and column identifiers as follows:

To access all the values inside the 2-D array we can create a nested for loop structure which has a for loop inside a bigger for loop. the outer loop with iterate through the rows which the inner loop will iterate through the columns. Check out the program example (below) to understand its working.

##### 2-D Arrays in C++ Example Program

Output
Enter Value of 2-D array A:
1 2 3 4
Values of 2-D array A:
1 2
3 4

### 2 thoughts on “C++ Multidimensional Arrays – 2D Arrays”

• May 21, 2018 at 2:44 am

#include
using namespace std;
int main()
{

cout<<"enter value of 2-d array a :"<<endl;
for(int i=0;i<2;i++);
{
for(int j=0;j>a[i][j];
}
}

cout<<"enter value of 2-d array b :"<<endl;
for(int i=0;i<2;i++);
{
for(int j=0;j>b[i][j];
}
}
for(int i=0;i<2;i++);
{
for(int j=0;j<2;j++)
{
}
}
for(int i=0;i<2;i++);
{
for(int j=0;j<2;j++)
{
subraction[i][j]=a[i][j]+b[i][j];
}
}
cout<<"value of addition array:"<<endl;
for(int i=0;i<2;i++);
{
for(int j=0;j<2;j++)
{
}
}

cout<<"value of subraction array:"<<endl;
for(int i=0;i<2;i++);
{
for(int j=0;j<2;j++)
{
cout<<subraction[i][j];
}
}

return 0;
}

i am getting error this could you please tell me why it happened
In function 'int main()':
14:16: error: 'i' was not declared in this scope
23:16: error: 'i' was not declared in this scope
30:18: error: 'i' was not declared in this scope
37:20: error: 'i' was not declared in this scope
45:24: error: 'i' was not declared in this scope
54:26: error: 'i' was not declared in this scope