Csharp/CSharp Tutorial/Data Structure/Array Reverse

Additional Array Methods

<source lang="csharp">using System; class ProgrammingLanguages {

   static void Main()
   {
       string[] languages = new string[]{"C#", "COBOL", "Java","C++", "Visual Basic", "Pascal", "Fortran", "Lisp", "J#"};
       System.Array.Sort(languages);
       String searchString = "COBOL";
       int index = System.Array.BinarySearch(languages, searchString);
       System.Console.WriteLine("The wave of the future, {0}, is at index {1}.", searchString, index);
       System.Console.WriteLine("{0,-20}\t{1,-20}", languages[0], languages[languages.Length - 1]);
       System.Array.Reverse(languages);
       System.Console.WriteLine("{0,-20}\t{1,-20}", languages[0], languages[languages.Length - 1]);
       System.Array.Clear(languages, 0, languages.Length);
       System.Console.WriteLine("{0,-20}\t{1,-20}", languages[0], languages[languages.Length - 1]);
       System.Console.WriteLine("After clearing, the array size is: {0}", languages.Length);
   }

}</source>

Reverse an array

<source lang="csharp">using System;

class MainClass {

 public static void Main() {  
   int i,j; 
   int[] nums1 = new int[10]; 
   int[] nums2 = new int[10]; 

   for(i=0; i < nums1.Length; i++) 
      nums1[i] = i*i; 

   Console.Write("Original contents: "); 
   for(i=0; i < nums2.Length; i++) 
     Console.Write(nums1[i] + " ");   

   Console.WriteLine(); 

   Console.Write("reverse copy nums1 to nums2");
   if(nums2.Length >= nums1.Length) // make sure nums2 is long enough 
     for(i=0, j=nums1.Length-1; i < nums1.Length; i++, j--) 
       nums2[j] = nums1[i]; 

   Console.Write("Reversed contents: "); 
   for(i=0; i < nums2.Length; i++) 
     Console.Write(nums2[i] + " ");   

   Console.WriteLine(); 
 } 

}</source>

Original contents: 0 1 4 9 16 25 36 49 64 81
reverse copy nums1 to nums2Reversed contents: 81 64 49 36 25 16 9 4 1 0

Reverse an array in a range

<source lang="csharp">using System;

class MainClass {

 public static void Main() {     
   int[] nums = { 1, 2, 3, 4, 5 }; 
  
   Console.Write("Original order: "); 
   foreach(int i in nums)  
     Console.Write(i + " "); 
   Console.WriteLine(); 

   // Reverse a range. 
   Array.Reverse(nums, 1, 3); 

   // Display reversed order. 
   Console.Write("Range reversed: "); 
   foreach(int i in nums)  
     Console.Write(i + " "); 
   Console.WriteLine(); 

 } 

}</source>

Original order: 1 2 3 4 5
Range reversed: 1 4 3 2 5

Reverse an array using Array.Reverse

<source lang="csharp">using System;

class MainClass {

 public static void Main() {     
   int[] nums = { 1, 2, 3, 4, 5 }; 
  
   Console.Write("Original order: "); 
   foreach(int i in nums)  
     Console.Write(i + " "); 
   Console.WriteLine(); 

   Array.Reverse(nums); 

   Console.Write("Reversed order: "); 
   foreach(int i in nums)  
     Console.Write(i + " "); 
   Console.WriteLine(); 

 } 

}</source>

Original order: 1 2 3 4 5
Reversed order: 5 4 3 2 1

Use the Reverse() method to reverse the elements in charArray

<source lang="csharp">using System; class MainClass {

 public static void Main()
 {
   char[] charArray = {"w", "e", "l", "c", "o", "m", "e"};
   Array.Sort(charArray);  // sort the elements      
   Array.Reverse(charArray);
   Console.WriteLine("Reversed charArray:");
   for (int i = 0; i < charArray.Length; i++)
   {
     Console.WriteLine("charArray[" + i + "] = " + charArray[i]);
   }
 }

}</source>

Reversed charArray:
charArray[0] = w
charArray[1] = o
charArray[2] = m
charArray[3] = l
charArray[4] = e
charArray[5] = e
charArray[6] = c

Use the Reverse() method to reverse the elements in intArray

<source lang="csharp">using System; class MainClass {

 public static void Main()
 {
   int[] intArray = {5, 2, 3, 1, 6, 9, 7, 14, 25};
   Array.Sort(intArray);
   
   Array.Reverse(intArray);
   Console.WriteLine("Reversed intArray:");
   for (int i = 0; i < intArray.Length; i++)
   {
     Console.WriteLine("intArray[" + i + "] = " +
       intArray[i]);
   }
 }

}</source>

Reversed intArray:
intArray[0] = 25
intArray[1] = 14
intArray[2] = 9
intArray[3] = 7
intArray[4] = 6
intArray[5] = 5
intArray[6] = 3
intArray[7] = 2
intArray[8] = 1

Use the Reverse() method to reverse the elements in stringArray

<source lang="csharp">using System; class MainClass {

 public static void Main()
 {
   string[] stringArray = {"t", "i", "a", "test", "abc123", "abc345"};
   Array.Sort(stringArray);
   
   Array.Reverse(stringArray);
   Console.WriteLine("Reversed stringArray:");
   for (int i = 0; i < stringArray.Length; i++)
   {
     Console.WriteLine("stringArray[" + i + "] = " + stringArray[i]);
   }
 }

}</source>

Reversed stringArray:
stringArray[0] = test
stringArray[1] = t
stringArray[2] = i
stringArray[3] = abc345
stringArray[4] = abc123
stringArray[5] = a