C#: Check if a number appears as either the first or last element of an array of integers

Last update on June 23 2025 12:58:37 (UTC/GMT +8 hours)

Check Number First or Last in Array

Write a C# program to check if a number appears as the first or last element of an array of integers. The array length is 1 or more.

Pictorial Presentation:

>C# Sharp Exercises: Check if a number appears as either the first or last element of an array of integers

Sample Solution:

C# Sharp Code:

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

public class Exercise46
{  
    public static void Main() 
    {
        // Prompt the user to input an integer
        Console.WriteLine("\nInput an integer:");

        // Read the input integer and store it in the variable 'x'
        int x = Convert.ToInt32(Console.ReadLine());

        // Define an array of integers 'nums' with pre-defined values
        int[] nums = {1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 9};

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

Sample Output:

Input an integer:                                                      
25                                                                     
False

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to verify if a number appears at both first and last positions of an array.
Write a C# program to check if the first element is greater than the last element in an array.
Write a C# program to check if any given number is in the first 3 or last 3 positions of an array.
Write a C# program to replace the last number with the first if both are equal.

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