C # array,

C # array,

An array is a data structure that can contain multiple elements of the same type. array elements in C # Start from scratch.

Arrays can be divided into simple arrays, multi-dimensional arrays, and sawtooth arrays.

Simple Array

1. Declaration and initialization

int [] x = new int[5];

After declaring the array, you must allocate memory to the array to save the elements of the array. The array is of the reference type, so it must be allocated with a pushed memory. Use the new operator to specify the type and quantity of elements in the array to initialize the variable of the array.

1. assign values to each element of the array using the array Initiator

int [] x = new int[5]{10,6,7,15,8};

2. the array size is not specified.

int [] x = new int[]{10,6,7,15,8};

3. Simplified Form

int [] x = {10,6,7,15,8};

2. Access array elements

1. Use the indexer to pass element numbers to access the Array

int [] x = {10,6,7,15,8};Console.WriteLine(x[0]); // 10Console.WriteLine(x[1]); // 6

2. Use For loop Traversal

int[] x = { 10, 6, 7, 15, 8 };for (int i = 0; i < x.Length; i++){     Console.Write(x[i]+" "); // 10 6 7 15 8}

3. Use foreach for loop Traversal

int[] x = { 10, 6, 7, 15, 8 };foreach (var i in x){    Console.Write(i + " "); // 10 6 7 15 8 }

4. Sort by Array. Sort

int[] x = { 10, 6, 7, 15, 8 };Array.Sort(x); foreach (var i in x){   Console.Write(i + " "); // 6 7 8 10 15}

5. Typical question: Bubble Sorting

int[] array = { 10, 6, 7, 15, 8 };int temp = 0;for (int i = 0; i < array.Length - 1; i++){    for (int j = i + 1; j < array.Length; j++)    {        if (array[j] < array[i])        {            temp = array[i];            array[i] = array[j];            array[j] = temp;        }    }}foreach (var i in array){    Console.Write(i + " ");   // 6 7 8 10 15}

Multi-dimensional array

Multi-dimensional arrays are indexed by two or more integers.

1. Two-dimensional array declaration and initialization

int[,] y1 = new int[2, 2];y[0, 0] = 1;y[0, 1] = 2;y[1, 0] = 3;y[1, 1] = 4;

int[,] y2 = { { 1, 2 }, { 3, 4 } };

2. 3D Array

int[,,] y3 ={    {{1, 2}, {3, 4}},    {{5, 6}, {7, 8}},    {{9, 10}, {11, 12}},};

Sawtooth Array

The two-dimensional array is a complete rectangle, while the size of the Sawtooth array is flexible. In the Sawtooth array, each row can have different sizes.

int[][] j = new int[3][];j[0] = new int[2] { 1, 2 };j[1] = new int[5] { 3, 4, 5, 6, 7 };j[2] = new int[3] { 8, 9, 10 };