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

# 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
}
}
}

// 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: