如何将十进制（或浮点）转换为二进制？ C#

Question

I have this given number, for example, 10.5 , and I want to convert it into its binary representation. The result should be 1010.1 . How to achieve that in C#?

Answer 1

To convert the part before the decimal point, you can just use the built-in Convert.ToString(integerPart, 2)

I don't believe there is such a built-in function for the fractional part, but you can do it like you learned in school for the decimal case:

// x must be < 1
string ConvertFractionalPart(double x, int maxDigits)
{
    var sb = new StringBuilder();
    while (x > 0 && sb.Length < maxDigits)
    {
        if (x >= 0.5)
        {
            sb.Append("1");
            x -= 0.5;
        }
        else
        {
            sb.Append("0");
        }
        x = 2*x;
    }
    return sb.ToString();
}