C#: Check whether one of the first 4 elements in an array of integers is equal to a given element

Last update on June 25 2025 13:02:55 (UTC/GMT +8 hours)

Element in First 4 Positions of Array

Write a C# Sharp program to check whether one of the first 4 elements in an array of integers is equal to a given element.

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Check if one of the first 4 elements in an array of integers is equal to a given element.

Sample Solution:-

C# Sharp Code:

using System;
using System.Linq;

// Namespace declaration
namespace exercises
{
    // Class declaration
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Calling the 'test' method with different arrays and integer inputs
            Console.WriteLine(test(new[] {1,2,9,3}, 3));    // Output: True
            Console.WriteLine(test(new[] {1,2,3,4,5,6}, 2));// Output: True
            Console.WriteLine(test(new[] {1,2,2,3}, 9));   // Output: False
            Console.ReadLine(); // Keeping the console window open
        }   

        // Method to check if an integer array contains a specific integer 'n' in the first 4 elements
        public static bool test(int[] numbers, int n)
        {
            // Using a ternary operator to check if the length of 'numbers' is less than 4
            // If the length of 'numbers' is less than 4, use 'Contains' to check if 'n' is present in 'numbers'
            // Otherwise, use 'Take(4)' to consider only the first 4 elements of 'numbers' and check if 'n' is present
            return numbers.Length < 4 ? numbers.Contains(n) : numbers.Take(4).Contains(n);
        }
    }
}

Sample Output:

True
True
False

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to verify whether a specified number occurs exactly once within the first 4 elements of an array.
Write a C# program to check if a given number is the maximum among the first 4 elements of an array.
Write a C# program to find if a specified number appears in the first 4 or the last 4 elements of an array.
Write a C# program to return true if the target value is in the first 4 elements and appears again later in the array.

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