C#: Check a specified number is present in a given array of integers

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

Check if Element Present in Array

Write a C# Sharp program to check if a specified number is present in a given array of integers.

visual Presentation:

C# Sharp: Basic Algorithm Exercises - Check a specified number is present in a given array of integers.

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[] {1,2,2,3}, 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
        public static bool test(int[] numbers, int n)
        {
            // Using LINQ's 'Contains' method to check if the array 'numbers' contains the integer 'n'
            if (numbers.Contains(n)) // If 'n' is found in the array 'numbers'
                return true; // Return true
            return false; // If 'n' is not found in the array 'numbers', return false
        }
    }
}

Sample Output:

True
True
False

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to check if the specified number appears at both the beginning and end of an integer array.
Write a C# program to determine whether a number appears at least twice in a given array of integers.
Write a C# program to check if a given number is present at an index divisible by 3 in an array.
Write a C# program to check if a number appears consecutively in an array at least once.

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