public int GetLargestPalindrome(int power)
{
int offset = (int)Math.Pow(1, power - 1);
int limit = (int)Math.Pow(10, power);
List <int> twoDigitNumbers = Enumerable.Range(offset, limit - offset).Select(x => x++).Reverse().ToList();
var query = (
from row in twoDigitNumbers
from col in twoDigitNumbers
orderby row descending, col descending
select new { row, col });
int max = 0;
Palindrome palindrome = new Palindrome();
foreach (var value in query)
{
var product = value.row * value.col;
if (palindrome.IsPalindrome(product.ToString()) && product > max)
{
max = product;
}
}
return(max);
}
public void ReturnTrueIfInputLengthIsOne()
{
const int input = 1;
bool actualValue = new Palindrome().IsPalindrome(input.ToString());
Assert.True(actualValue);
}
public void TestPalindromeNumber(int input, bool expectedValue)
{
bool actualValue = new Palindrome().IsPalindrome(input.ToString());
Assert.Equal(expectedValue, actualValue);
}