Csharp/CSharp Tutorial/Data Structure/Array Length
Содержание
Array sizes and dimensions.
<source lang="csharp">using System; class MainClass {
public static void PrintArray(int[] arr) { for (int i = 0; i < arr.Length; ++i) Console.WriteLine("OneDArray Row {0} = {1}", i, arr[i]); } public static void PrintArrayRank(int[,] arr) { Console.WriteLine("PrintArrayRank: {0} dimensions", arr.Rank); }
public static void Main() { int[] x = new int[10]; for (int i = 0; i < 10; ++i) x[i] = i; PrintArray(x); int[,] y = new int[10, 20]; for (int k = 0; k < 10; ++k) for (int i = 0; i < 20; ++i) y[k, i] = i * k; PrintArrayRank(y); }
}</source>
Defining the Array Size at Runtime
<source lang="csharp">class MainClass {
static void Main() { string[] groceryList; System.Console.Write("How many items on the list? "); int size = int.Parse(System.Console.ReadLine()); groceryList = new string[size]; }
}</source>
Use the GetLength() method to get number of elements in each dimension of the two dimensional array
<source lang="csharp">using System; class MainClass {
public static void Main() { string[,] names = { {"J", "M", "P"}, {"S", "E", "S"}, {"C", "A", "W"}, {"G", "P", "J"}, }; int numberOfRows = names.GetLength(0); int numberOfColumns = names.GetLength(1); Console.WriteLine("Number of rows = " + numberOfRows); Console.WriteLine("Number of columns = " + numberOfColumns); }
}</source>
Number of rows = 4 Number of columns = 3
Use the Length array property
<source lang="csharp">using System;
class MainClass {
public static void Main() { int[] nums = new int[10]; Console.WriteLine("Length of nums is " + nums.Length); Console.Write("use Length to initialize nums"); for(int i=0; i < nums.Length; i++) nums[i] = i * i; Console.Write("now use Length to display nums"); Console.Write("Here is nums: "); for(int i=0; i < nums.Length; i++) Console.Write(nums[i] + " "); }
}</source>
Length of nums is 10 use Length to initialize numsnow use Length to display numsHere is nums: 0 1 4 9 16 25 36 49 64 81 "
Use the Length array property on a 3-D array
<source lang="csharp">using System;
class MainClass {
public static void Main() { int[,,] nums = new int[10, 5, 6]; Console.WriteLine("Length of nums is " + nums.Length); }
}</source>
Length of nums is 300
Using Length - 1 in the Array Index
<source lang="csharp">class MainClass {
static void Main() { string[] languages = new string[9]; languages[4] = languages[languages.Length - 1]; }
}</source>