Question

I need a function like

int GetIntegerFromBinaryString(string binary, int bitCount)

if binary = “01111111” and bitCount = 8, it should return 127

if binary = “10000000” and bitCount = 8, it should return -128

The numbers are stored in 2’s complement form. How can I do it. Is there any built in functions that would help so that I needn’t calculate manually.

Answer 1

here you go.

    static int GetIntegerFromBinaryString(string binary, int bitCount)
    {
        if (binary.Length == bitCount && binary[0] == '1')
            return Convert.ToInt32(binary.PadLeft(32, '1'),2);
        else
            return Convert.ToInt32(binary,2);
    }

Convert it to the 2-s complement version of a 32 bit number, then simply let the Convert.ToInt32 method do it’s magic.