Code Golf: Numeric equivalent of an Excel column name

Answer 1

C#, 148 chars

using System;class P{static void Main(string[]a){var r=0d;int j=0,i=a[0].
Length;while(i-->0)r+=(a[0][i]-64)*Math.Pow(26,j++);Console.WriteLine(r);}}

Ungolfed:

using System;
class P
{
    static void Main(string[] a)
    {
        var r = 0d;
        int j = 0, i = a[0].Length;
        while (i-- > 0)
            r += (a[0][i] - 64) * Math.Pow(26, j++);

        Console.WriteLine(r);
    }
}