C#: Find the product of two integers in an array

C# Sharp Array: Exercise-41 with Solution

Write a C# Sharp program to find two numbers in an array of integers whose product is equal to a given number.

Sample Data:
({10, 18, 39, 75, 100}, 180) -> {10, 18}
({10, 18, 39, 75, 100}, 200) -> {}
({10, 18, 39, 75, 100}, 702) -> {18, 39}

Sample Solution:

C# Sharp Code:

using System;
using System.Linq;
using System.Collections.Generic;

namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            // Initializing an array of integers
            int[] nums1 = { 10, 18, 39, 75, 100 };

            // Displaying original array elements using string.Join method
            Console.WriteLine("Original array elements:");
            int n = 180;
            Console.WriteLine($"{string.Join(", ", nums1)}");

            // Displaying the given number 'n'
            Console.WriteLine("The given number (n): " + n);

            // Finding and displaying pairs of integers in the array that multiply to give 'n'
            Console.WriteLine("Product of two integers in the said array equal to n:");
            int[] result = test(nums1, n);
            Console.WriteLine($"{string.Join(", ", result)}");

            // Changing the value of 'n' and repeating the process
            n = 200;
            Console.WriteLine("\nOriginal array elements:");
            Console.WriteLine($"{string.Join(", ", nums1)}");
            Console.WriteLine("The given number (n): " + n);
            Console.WriteLine("Product of two integers in the said array equal to n:");
            int[] result1 = test(nums1, n);
            Console.WriteLine($"{string.Join(", ", result1)}");

            n = 702;
            Console.WriteLine("\nOriginal array elements:");
            Console.WriteLine($"{string.Join(", ", nums1)}");
            Console.WriteLine("The given number (n): " + n);
            Console.WriteLine("Product of two integers in the said array equal to n:");
            int[] result2 = test(nums1, n);
            Console.WriteLine($"{string.Join(", ", result2)}");
        }

        // Method to find pairs of integers in the array that multiply to give 'n'
        public static int[] test(int[] nums, int n)
        {
            List<int> result = new List<int>();

            // Loop through each element in the 'nums' array
            foreach (int x in nums)
            {
                foreach (int y in nums)
                {
                    // Check if the product of 'x' and 'y' equals 'n'
                    if (x * y == n)
                    {
                        // If the product equals 'n', add 'y' to the result list
                        result.Add(y);
                    }
                }
            }

            // Sort the result list in ascending order and convert it to an array before returning
            return result.OrderBy(el => el).ToArray();
        }
    }
}

Sample Output:

Original array elements:
10, 18, 39, 75, 100
The given number (n): 180
Product of two integers in the said array equal to n:
10, 18

Original array elements:
10, 18, 39, 75, 100
The given number (n): 200
Product of two integers in the said array equal to n:


Original array elements:
10, 18, 39, 75, 100
The given number (n): 702
Product of two integers in the said array equal to n:
18, 39
 

Flowchart:

C# Sharp Code Editor:

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