epicours/Prog/Array.md

Simple array (1 dimension)

An array is a vector in a collection

To declare an array we use :

public static void Main() {
	int[] vect = new int[4] // Declare a vector of 4 elements (from 0 to 3)
	vect[3] = 22;
	Console.WriteLine($"b = {b}");
	Console.WriteLine($"{vect[3]}");
}

The result will be:

b = 0
22

We see that an array start from 0 to n-1

Complex array (x dimension)

To create a vect with multiple dimension, we just have to declare an array and add a brackets to define multiple dimension

// First version
public static void Main() {
	int[,] mat = new int[12, 9] // Declare an array of two dimensions mat with default value for [0] 
	mat[3, 4] = 12;
}

// Second version
public static void Main() {
	int[,] mat = {
		{ 2, 3 },
		{ 4, 5 }
	};
	int a = mat[1, 0];
}

To display a matrice we will use:

public static void Main() {
	int[,] mat = {
		{ 2, 3 },
		{ 4, 5 }
	};
	int a = mat[1, 0];
	for (int x = 0; x < math.GetLenght(...); x++) {
		for (int y = 0; y < math.GetLenght(...); y++) {
			Console.WriteLine(mat[x, y])
		}
	}
}