C#: Check if a given number present in an array of numbers

Last update on June 24 2025 12:57:37 (UTC/GMT +8 hours)

Check Number in Array

Write a C# program to check if a given number is present in an array of numbers.

Sample Solution:

C# Sharp Code:

using System;
using System.Linq;

namespace exercises
{
    class Program
    {
        // Main method where the program execution begins
        static void Main(string[] args)
        {
            int[] nums = { 1, 3, 5, 7, 9 };
            int n = 6;

            // Calls the test function and prints the result
            Console.WriteLine(test(nums, n));

            n = 3;

            // Calls the test function again with a different value of n and prints the result
            Console.WriteLine(test(nums, n));
        }

        // Function to test if an array contains a specific element
        public static bool test(int[] arra, int n)
        {
            // Uses the Contains method of LINQ to check if the array contains the given number 'n'
            return arra.Contains(n);
        }
    }
}

Sample Output:

False
True

Flowchart:

Sample Solution-1:

C# Sharp Code:

using System;
using System.Linq;

namespace exercises
{
    class Program
    {
        // Main method where the program execution begins
        static void Main(string[] args)
        {
            int[] nums = { 1, 3, 5, 7, 9 };
            int n = 6;

            // Calls the test function and prints the result
            Console.WriteLine(test(nums, n));

            n = 3;

            // Calls the test function again with a different value of n and prints the result
            Console.WriteLine(test(nums, n));
        }

        // Function to test if an array contains a specific element using a foreach loop
        public static bool test(int[] arra, int n)
        {
            // Loop through each element in the array
            foreach (int item in arra)
            {
                // Check if the current element matches the given number 'n'
                if (item == n) 
                    return true; // If found, return true immediately
            }
            return false; // If not found after checking all elements, return false
        }
    }
}

Sample Output:

False
True

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to check if a given number appears more than once in an array.
Write a C# program to return the index of a given number if it appears exactly once in the array.
Write a C# program to check whether all numbers from 1 to 10 are present in the array.
Write a C# program to return true only if a number appears in both the first and second half of an array.

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