Last week, I stumbled upon the following piece of code:

IList<double> doubles = new List<double> {22.123, 400.12, 100.22};
foreach (int number in doubles)
{
    Console.WriteLine("The Current Number Is : {0}", number);
}

Can you see the bug in that code? We convert all of the doubles in the list to integers, truncating them. I was very surprised that the compiler didn’t warn me about this issue, especially because the compiler would not let me write this code: