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Different ways to sort an array in descending order in C#

An array is a group of like-typed variables that are referred to by a common name. And each data item is called an element of the array. Arranging the array’s elements from largest to smallest is termed as sorting the array in descending order.

Examples:

Input : array = {5, 9, 1, 4, 6, 8};
Output : 9, 8, 6, 5, 4, 1

Input : array = {1, 9, 6, 7, 5, 9};
Output : 9 9 7 6 5 1

Input : array = {-8, 9, 7, 7, 0, 9, -9};
Output : 9 9 7 7 0 -8 -9

Method 1: Using Array.Sort() and Array.Reverse() Method
First, sort the array using Array.Sort() method which sorts an array ascending order then, reverse it using Array.Reverse() method.

// C# program sort an array in decreasing order
// using Array.Sort() and Array.Reverse() Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing the array
        int[] arr = new int[] {1, 9, 6, 7, 5, 9};
  
        // Sort array in ascending order.
        Array.Sort(arr);
  
        // reverse array
        Array.Reverse(arr);
  
        // print all element of array
        foreach(int value in arr)
        {
            Console.Write(value + " ");
        }
    }
}

Output:

9 9 7 6 5 1

Method 2: Using CompareTo() Method
You can also sort an array in decreasing order by using CompareTo() method.



// C# program sort an array in 
// decreasing order using 
// CompareTo() Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing the array
        int[] arr = new int[] {1, 9, 6, 7, 5, 9};
  
        // Sort the arr from last to first.
        // compare every element to each other
        Array.Sort<int>(arr, new Comparison<int>(
                  (i1, i2) => i2.CompareTo(i1)));
  
        // print all element of array
        foreach(int value in arr)
        {
            Console.Write(value + " ");
        }
    }
}

Output:

9 9 7 6 5 1

Method 3: Using delegate
Here, first Sort() the delegate using an anonymous method.

// C# program sort an array 
// in decreasing order
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing the array
        int[] arr = new int[] {1, 9, 6, 7, 5, 9};
  
        // Sort the arr from last to first
        // Normal compare is m-n 
        Array.Sort<int>(arr, delegate(int m, int n)
                                { return n - m; });
  
        // print all element of array
        foreach(int value in arr)
        {
            Console.Write(value + " ");
        }
    }
}

Output:

9 9 7 6 5 1

Method 4: Using Iterative way

Sort an array without using any inbuilt function by iterative way.

// C# program sort an array 
// in decreasing order using 
// iterative way
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // declaring and initializing the array
        int[] arr = new int[] {1, 9, 6, 7, 5, 9};
  
        int temp;
  
        // traverse 0 to array length
        for (int i = 0; i < arr.Length - 1; i++)
  
            // traverse i+1 to array length
            for (int j = i + 1; j < arr.Length; j++)
  
                // compare array element with 
                // all next element
                if (arr[i] < arr[j]) {
  
                    temp = arr[i];
                    arr[i] = arr[j];
                    arr[j] = temp;
                }
  
        // print all element of array
        foreach(int value in arr)
        {
            Console.Write(value + " ");
        }
    }
}

Output:

9 9 7 6 5 1

Method 5: Using LINQ descending
LINQ stands for Language Integrated Query. It is a uniform query syntax which is used to retrieve and save the data from the different sources. Here, OrderByDescending sorting method is used for descending order sorting. The LINQ returns IOrderedIEnumerable, which is converted to Array using ToArray() method.

// C# program sort an array in decreasing 
// order by using LINQ OrderByDescending 
// method
using System;
using System.Linq;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing the 
        // array with 6 positive number
        int[] arr = new int[] {1, 9, 6, 7, 5, 9};
  
        // Sort the arr in decreasing order
        // and return a array
        arr = arr.OrderByDescending(c => c).ToArray();
  
        // print all element of array
        foreach(int value in arr)
        {
            Console.Write(value + " ");
        }
    }
}

Output:

9 9 7 6 5 1


This article is attributed to GeeksforGeeks.org

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