Programmatically check if a number is a palindrome

Question

This sounds like homework, yes it is (of someone else), I asked a friend of mine who is learning C# to lend me some of his class exercises to get the hang of it.

So as the title says: How can I check if a number is a Palindrome?

I'm not asking for source code (although its very useful), but rather that someone explained how should the code should work, so that it can be applied to many different languages.

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The Solution:

@statikfx searched SO for this and found the solution.

 n = num;
 while (num > 0)
 {
      dig = num % 10;
      rev = rev * 10 + dig;
      num = num / 10;
 }
// If (n == rev) then num is a palindrome

Answer 1

I check for palindromes by converting the integer to a string, then reversing the string, then comparing equality. This will be the best approach for you since you're just starting out.

Since you're working in C# and this is homework, I'll use very obscure-looking Python that won't help you:

def is_palindrome(i):
    s = str(i)
    return s[::-1] == s

Convert that to C# and you'll have your answer.