2D Array in C++

Work with 2D arrays (matrices) in C++.

IntermediateArray ProgramsExample 4 of 4

2d-array.cpp

1#include <iostream>
2using namespace std;
3
4int main() {
5    int rows, cols;
6    
7    cout << "Enter number of rows: ";
8    cin >> rows;
9    cout << "Enter number of columns: ";
10    cin >> cols;
11    
12    int matrix[rows][cols];
13    
14    cout << "Enter matrix elements:" << endl;
15    for (int i = 0; i < rows; i++) {
16        for (int j = 0; j < cols; j++) {
17            cin >> matrix[i][j];
18        }
19    }
20    
21    cout << "Matrix:" << endl;
22    for (int i = 0; i < rows; i++) {
23        for (int j = 0; j < cols; j++) {
24            cout << matrix[i][j] << " ";
25        }
26        cout << endl;
27    }
28    
29    return 0;
30}

Output

Enter number of rows: 3
Enter number of columns: 3
Enter matrix elements:
1 2 3
4 5 6
7 8 9
Matrix:
1 2 3
4 5 6
7 8 9

What's going on

A 2D array (matrix) is an array of arrays. We use nested loops to read and display elements. The first index represents the row, and the second index represents the column. This structure is useful for representing tabular data.

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