🗊Презентация 1D and 2D arrays

Цель обучения (Learning objectives):

Критерии успеха (Successful criteria):

Questions for discussion What are arrays? How to determine the name of the array, the dimension of the array, the index of the element, the elements of the array, the types of elements of the array. How to declare an array data type in a variable section

An array is a named set of the same type of data that is stored in memory consecutively one after the other. An array is a named set of the same type of data that is stored in memory consecutively one after the other. Access to the elements of the array is carried out by the index (number) of the element. An array can contain elements of any data type (integer, real, character, string). The number of elements in an array is called the size of the array.

Declaration of an array in the variable section

Initializing array elements 1 variant int [] к; //к — array k= nеw int [3]; //Define an array of 3 integers к[0]=-5; к[1]=4; к[2]=55; // Set array elements 2 variant int[] а = {0, 2, 4, 6, 8}; 3 variant int[] а = nеw int [] {0, 2, 4, 6, 8}; 4 variant int[] а=nеw int[5]; а[0] = 0; а[1] = 2; а[2] = 4; а[3] = 6; а[4] = 8;

Task: One-dimensional array is given. You need to calculate the sum of the elements of this array. The value of the elements is set randomly. Task: One-dimensional array is given. You need to calculate the sum of the elements of this array. The value of the elements is set randomly. private void button1_Click(object sender, EventArgs e) { Random rd = new Random(); int[] mass = new int[5]; int i, s = 0; for (i = 0; i<mass.Length; i++) { mass[i] = rd.Next(5); s = s + mass[i]; listBox1.Items.Add(mass[i]); } label1.Text = Convert.toString(s); }

Exercise #1

Exercise #2

Exercise #3

Exercise #4

Exercise #5 Output ten array elements in line in a space. Write fragment of code.

What is the output of the following code:

One dimensional array on Wikibooks

Two dimensional array (Matrix)

Declaration int [,] mas = new int[5,5]; int[,] mas = new int[3, 3] { { 4, 7, 3 }, { 3, 6, 9 }, { 0, 1, 4 } }; int[,] mas = { { 4, 7, 3 }, { 3, 6, 9 }, { 0, 1, 4 } };

Assign Values to Two Dimension

Two dimensional arrays on wikibooks

Reflection