C#: Find the second smallest element in an array

Last update on December 20 2024 12:36:29 (UTC/GMT +8 hours)

Write a C# Sharp program to find the second smallest element in an array.

C# Sharp: Find the second smallest element in an array

Sample Solution:-

C# Sharp Code:

using System;

public class Exercise17 
{  
    public static void Main() 
    {
        int n, i, j = 0, sml, sml2nd; // Declare variables for array size, counting, and finding smallest elements
        int[] arr1 = new int[50]; // Declare an array to store integers

        // Display a message prompting the user to input the size of the array
        Console.Write("\n\nFind the second smallest element in an array :\n");
        Console.Write("-----------------------------------------\n");  

        Console.Write("Input the size of array : ");
        n = Convert.ToInt32(Console.ReadLine()); // Read the size of the array entered by the user

        /* Store values into the array */
        Console.Write("Input {0} elements in the array (value must be <9999):\n", n);
        for (i = 0; i < n; i++)
        {
            Console.Write("element - {0} : ", i);
            arr1[i] = Convert.ToInt32(Console.ReadLine()); // Store user input in the array
        }

        /* Find the location of the smallest element in the array */
        sml = 99999; // Initialize the smallest element with a large value to ensure comparison
        for (i = 0; i < n; i++)
        {
            if (sml > arr1[i])
            {
                sml = arr1[i]; // Find the smallest element
                j = i; // Store the index of the smallest element
            }
        }

        /* Find the second smallest element in the array by ignoring the smallest element */
        sml2nd = 99999;
        for (i = 0; i < n; i++)
        {
            if (i == j)
            {
                i++; /* Ignore the smallest element */
                i--;
            }
            else
            {
                if (sml2nd > arr1[i])
                {
                    sml2nd = arr1[i]; // Find the second smallest element
                }
            }
        }

        Console.Write("The Second smallest element in the array is :  {0} \n\n", sml2nd); // Display the second smallest element
    }
}

Sample Output:

Find the second smallest element in an array :                                                                
-----------------------------------------                                                                     
Input the size of array : 5                                                                                   
Input 5 elements in the array (value must be <9999>:                                                          
element - 0 : 2                                                                                               
element - 1 : 4                                                                                               
element - 2 : 6                                                                                               
element - 3 : 8                                                                                               
element - 4 : 10                                                                                              
The Second smallest element in the array is :  4

Flowchart:

C# Sharp Code Editor:

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