Home » .Net » C# Programs

C# - Sort an Array in Descending Order Using Insertion Sort

Here, we are going to learn how to sort an array in descending order using insertion sort in C#? By Nidhi Last updated : March 28, 2023

Here, we will sort an integer array using insertion sort in the descending order.

C# program to sort an array in descending order using insertion sort

The source code to implement insertion sort to arrange elements in the descending order is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

// C# program to sort an array in descending order 
// using Insertion Sort.

using System;

class Sort {
  static void InsertSort(ref int[] intArr) {
    int item = 0;
    int pass = 0;
    int loop = 0;

    for (pass = 1; pass < intArr.Length; pass++) {
      item = intArr[pass];
      for (loop = pass - 1; loop >= 0;) {
        if (item > intArr[loop]) {
          intArr[loop + 1] = intArr[loop];
          loop--;
          intArr[loop + 1] = item;
        } else
          break;
      }
    }
  }
  
  static void Main(string[] args) {
    int[] intArry = new int[5] {65, 34, 23, 76, 21};

    Console.WriteLine("Array before sorting: ");
    for (int i = 0; i < intArry.Length; i++) {
      Console.Write(intArry[i] + " ");
    }
    Console.WriteLine();

    InsertSort(ref intArry);

    Console.WriteLine("Array before sorting: ");
    for (int i = 0; i < intArry.Length; i++) {
      Console.Write(intArry[i] + " ");
    }
    Console.WriteLine();
  }
}

Output

Array before sorting:
65 34 23 76 21
Array before sorting:
76 65 34 23 21
Press any key to continue . . .

Explanation

In the above program, we created a class Sort that contains two static methods InsertionSort() and Main(). The InsertionSort() method is used to sort the elements of integer array in the descending order.

Now look to the Main() method, The Main() method is the entry point for the program. Here we created the array of integers then sorted the array in descending order using InsertionSort() method and print the sorted array on the console screen.

C# Data Structure Programs »