How to create a Two Dimensional Array in C++ - Step by Step Examples

◀ Previous Next ▶

How to create a Two Dimensional Array in C++ ?

Answer

To create a Two Dimensional Array in C++, you can use a vector of vectors.

✐ Examples

1 Creating a 2D Array of Integers

In this example,

We include the vector header.
We declare and initialize a 2D vector of integers named matrix with dimensions 3x3.
We assign values to the elements of the vector.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the vector.

C++ Program

#include <iostream>
#include <vector>
int main() {
    std::vector<std::vector<int>> matrix(3, std::vector<int>(3));
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            matrix[i][j] = i + j;
        }
    }
    std::cout << "[";
    for (int i = 0; i < 3; i++) {
        std::cout << "[";
        for (int j = 0; j < 3; j++) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << "]\n";
    }
    std::cout << "]\n";
    return 0;
}

Output

[[0 1 2 ]
 [1 2 3 ]
 [2 3 4 ]]

2 Creating a 2D Array of Characters

In this example,

We include the vector header.
We declare and initialize a 2D vector of characters named matrix with dimensions 2x2.
We assign values to the elements of the vector.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the vector.

C++ Program

#include <iostream>
#include <vector>
int main() {
    std::vector<std::vector<char>> matrix(2, std::vector<char>(2));
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
            matrix[i][j] = 'A' + i + j;
        }
    }
    std::cout << "[";
    for (int i = 0; i < 2; i++) {
        std::cout << "[";
        for (int j = 0; j < 2; j++) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << "]\n";
    }
    std::cout << "]\n";
    return 0;
}

Output

[[A B ]
 [B C ]]

Summary

In this tutorial, we learned How to create a Two Dimensional Array in C++ language with well detailed examples.

◀ Previous Next ▶

C++ Tutorials

C++ How-Tos

How to create a Two Dimensional Array in C++ - Step by Step Examples

How to create a Two Dimensional Array in C++ ?

Answer

✐ Examples

1 Creating a 2D Array of Integers

C++ Program

Output

2 Creating a 2D Array of Characters

C++ Program

Output

Summary

More C++ Arrays Tutorials