C#: Check if the first or the last element of the two arrays are equal

Last update on June 23 2025 12:58:36 (UTC/GMT +8 hours)

First or Last Element Equal in Two Arrays

Write a C# program to check if the first or the last element of the two arrays (length 1 or more) are equal.

Pictorial Presentation:

>C# Sharp Exercises: Check if the first or the last element of the two arrays are equal

Sample Solution:

C# Sharp Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Exercise49
{  
    public static void Main() 
    {
        // Define an array of integers 'nums1' with pre-defined values
        int[] nums1 = {1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 1};

        // Display the elements of 'nums1' array using string.Join to concatenate them
        Console.WriteLine("\nArray1: [{0}]", string.Join(", ", nums1));

        // Define another array of integers 'nums2' with pre-defined values
        int[] nums2 = {1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 5};

        // Display the elements of 'nums2' array using string.Join to concatenate them
        Console.WriteLine("\nArray2: [{0}]", string.Join(", ", nums2));

        // Display a message indicating the check being performed on the first and last elements of both arrays
        Console.WriteLine("\nCheck if the first element or the last element of the two arrays (length 1 or more) are equal.");

        // Check if the first element of 'nums1' is equal to the first element of 'nums2'
        // OR if the last element of 'nums1' is equal to the last element of 'nums2'
        // Print the result of the logical OR operation between these conditions
        Console.WriteLine((nums1[0].Equals(nums2[0])) || (nums1[nums1.Length - 1].Equals(nums2[nums2.Length - 1])));
    } 
}

Sample Output:

Array1: [1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 1]                  
                                                                       
Array2: [1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 5]                  
                                                                       
Check if the first element or the last element of the two arrays ( leng
th 1 or more) are equal.                                               
True

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to determine if the middle elements of two arrays are equal.
Write a C# program to merge two arrays only if their first or last elements match.
Write a C# program to compare the sums of two arrays and return the one with a larger sum if they share a common boundary element.
Write a C# program to compare arrays and count how many starting and ending elements are equal.

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