How to get the Nth digit of an integer with bit-wise operations?

Question

Example. 123456, and we want the third from the right (\'4\') out.

The idea in practise is to access each digit seperately (ie. 6 5 4 3 2 1).

C/C++/C# preferred.

Answer 1

Just for fun, here is the C# extension class for it:

public static class IntExtensions
{
    /// 

    /// Returns the nth digit from an int, 
    /// where 0 is the least significant digit 
    /// and n is the most significant digit.
    /// 
    public static int GetDigit(this int number, int digit)
    {
        for (int i = 0; i < digit; i++)
        {
            number /= 10;
        }
        return number % 10;
    }
}

Usage:

int myNumber = 12345;
int five = myNumber.GetDigit(0);
int four = myNumber.GetDigit(1);
int three = myNumber.GetDigit(2);
int two = myNumber.GetDigit(3);
int one = myNumber.GetDigit(4);
int zero = myNumber.GetDigit(5);