C# get digits from float variable

Question

I have a float variable and would like to get only the part after the comma, so if I have 3.14. I would like to get 14 as an integer. How can I do that?

Answer 1

Here's the "noncheating" answer:

double n = 3.14;
const double precision = 0.000001;

// we don't handle negative numbers very well
if (n < 0)
    n = 0 - n;

// remove the integer part of n
n -= Math.Floor(n);
int result = 0;
while (n > precision)
{
    // move 1/10th digit of n into 1's place
    n *= 10;
    // get that digit
    int digit = (int)Math.Floor(n);
    // shift result left and add digit to it
    result = result * 10 + digit;
    // remove 1's digit from n
    n -= digit;
}

// answer is in result;

We use precision instead of 0 to make up for the fact that floating point numbers don't work very well with decimal numbers. You can adjust it to suit your application. This is why I think the "cheating" string way is actually better.