How to get difference between two array without using linq or Set operator using csharp ?

[ahmedsa2018]

I work on csharp
I have two arrays of string

A1 = [Watermelon, Apple, Mango, Guava, Banana]
A2 = [Orange, Kiwi, Apple, Watermelon]

i need to write code by csharp get difference between two arrays
and display difference between two arrays but without using linq or set operator

expected result
Mango
Guava
Orange
Kiwi

 

[mikrom]

Banana should be in expected result too

 

[ahmedsa2018]

yes
correct
sorry for missed Banana

expected result will be

expected result
Mango
Guava
Banana
Orange
Kiwi

 

[ahmedsa2018]

so How to do that please ?

 

[mikrom]

What have you tried so far ?

 

[ahmedsa2018]

i tried and reached to result by linq

var array1 = new[] { "Watermelon", "Apple", "Mango", "Guava", "Banana" };
var array2 = new[] { "Orange", "Kiwi", "Apple", "Watermelon" };

var result = array2.Except(array1).Concat(array1.Except(array2));

but i need it to get result without using linq or set operator

 

[mikrom]

Simply something like this should work:
iterate over first array and check every element if it is in the second array too - and if not then this is the different element.
Then do the same with the second array.

 

[mikrom]

I tried what I described before:

using System;

class Program
{
	public static void Main(string[] args)
	{
		string[] a = {"Watermelon", "Apple", "Mango", "Guava", "Banana"};
		string[] b = {"Orange", "Kiwi", "Apple", "Watermelon"};

		Console.WriteLine("Differences:\n");	
		int numDiff = arrayDifference(a, b);
		string diffResult = numDiff == 0 ? "There are no differences" : "Number of differences found: " + numDiff;
		Console.WriteLine("\n" + diffResult + "\n");
		
		Console.Write("Press any key to continue . . . ");
		Console.ReadKey(true);
	}
	
	static int arrayDifference(string[] x, string[] y) {
		int numberOfDifferentElements = 0;
		
		foreach(string s in x) {
			if (Array.IndexOf(y, s) == -1) {
				Console.WriteLine(s);
				numberOfDifferentElements++;
			}
		}
		
		foreach(string s in y) {
			if (Array.IndexOf(x, s) == -1) {
				Console.WriteLine(s);
				numberOfDifferentElements++;
			}
		}
		
		return numberOfDifferentElements;
	}
}

Output:

Differences:

Mango
Guava
Banana
Orange
Kiwi

Number of differences found: 5

Press any key to continue . . .

 

[mikrom]

ahmedsa2018, was this what you needed ?