Impara Declaring and Using 2D Arrays | Working with 2D Arrays

Two-dimensional arrays, or 2D arrays, allow you to store data in a grid-like structure with rows and columns. You can think of a 2D array as a table, where each cell holds a value. This structure is useful for representing matrices, game boards, seating charts, or any data that naturally fits into rows and columns.

Definition

A 2D array is an array of arrays, often visualized as a table or matrix. Each element is identified by two indices: one for the row and one for the column.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Declare and initialize a 2D integer array (3 rows, 4 columns)
            int[,] matrix = new int[3, 4]
            {
                {1, 2, 3, 4},
                {5, 6, 7, 8},
                {9, 10, 11, 12}
            };

            // Print the element at the first row and first column
            Console.WriteLine("Element at (0, 0): " + matrix[0, 0]);
        }
    }
}

In a 2D array, elements are accessed using two indices: one for the row and one for the column. In the code above, matrix[0, 0] accesses the element in the first row and first column. The first index always represents the row, and the second represents the column. Indexing starts at zero, so the first row is index 0, the second row is index 1, and so on. The same applies to columns.

Program.cs


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// File: Program.cs
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[,] matrix = new int[3, 4]
            {
                {1, 2, 3, 4},
                {5, 6, 7, 8},
                {9, 10, 11, 12}
            };

            // Print all elements using nested loops
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write(matrix[row, col] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}

This code above creates a two-dimensional array (a 3×4 matrix) and prints all its elements using nested loops. The outer loop iterates through each row, while the inner loop goes through each column of that row. Each value is printed in order, producing a structured matrix layout in the console.

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Sezione 4. Capitolo 1

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Suggested prompts:

Can you explain how to create a 2D array in a specific programming language?

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Definition

A 2D array is an array of arrays, often visualized as a table or matrix. Each element is identified by two indices: one for the row and one for the column.

Program.cs


              12345678910111213141516171819202122
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Declare and initialize a 2D integer array (3 rows, 4 columns)
            int[,] matrix = new int[3, 4]
            {
                {1, 2, 3, 4},
                {5, 6, 7, 8},
                {9, 10, 11, 12}
            };

            // Print the element at the first row and first column
            Console.WriteLine("Element at (0, 0): " + matrix[0, 0]);
        }
    }
}

Program.cs


              1234567891011121314151617181920212223242526272829
            
// File: Program.cs
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[,] matrix = new int[3, 4]
            {
                {1, 2, 3, 4},
                {5, 6, 7, 8},
                {9, 10, 11, 12}
            };

            // Print all elements using nested loops
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write(matrix[row, col] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}

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Grazie per i tuoi commenti!

Sezione 4. Capitolo 1

Declaring and Using 2D Arrays

1. How do you access the element in the second row and third column of a 2D array?

2. What is the difference between a 1D and a 2D array?

3. Why are nested loops used with 2D arrays?

Declaring and Using 2D Arrays

1. How do you access the element in the second row and third column of a 2D array?

2. What is the difference between a 1D and a 2D array?

3. Why are nested loops used with 2D arrays?