base no. algo

gistfile1.rb

#!/usr/bin/env ruby

#Convert a binary value to decimal...
x = 1011
n = Math.log10(x).to_i + 1
b = 2 #binary
s = 0

x.to_s.chars.map(&:to_i).each do |u|
	n = n - 1
	value = u * b ** n
	s = s + value
end
puts "Result from binary is #{s}"

#Convert a hex value to decimal...
alphabet = ["A", "B", "C", "D", "E", "F"]
x = "9F"
n = x.length
b = 16 #base 16
s = 0

x.split("").each do |u|
	#decrement the digit count by 1
	n = n -1
	
	if u.match /[A-Za-z]/
		hex = 9 + (alphabet.index(u) + 1)
        s = s + hex * (b ** n)
	else 
        s = s + u.to_i * (b ** n)
	end
end
puts "Result from hex is #{s}"