I’m encountering unexpected behavior in my C# code involving floating-point arithmetic and typecasting to integers. Here’s a simplified version of the code:

static void Main(string[] args)
{
    int d0 = (int)(2.300000000000001 * 100D);
    int d1 = (int)(2.3000 * 100D);
    Console.WriteLine(d0);
    Console.WriteLine(d1);
    return;
}

In this code, d0 and d1 are both assigned the result of a floating-point multiplication cast to an integer.

The expected result for both d0 and d1 should be 230. However, while d0 correctly evaluates to 230, d1 is unexpectedly resulting in 229.

I understand that floating-point arithmetic can sometimes introduce small errors due to precision limitations, but I can’t explain why d1 is yielding 229. Could someone help clarify why this might be happening and how to resolve it to get the expected result of 230 for d1?