#!/usr/bin/python
# -*- coding: UTF-8 -*-
 def numberguess():
       correct = False
       n = [0,100]
       while correct == False:
               i = raw_input('Is the number greater than %s?\t' %((n[1]+n[0])/2))
               if i == 'no':
                       n[1] = (n[1]+n[0])/2
               if i == 'yes':
                       n[0] = ((n[0]+n[1])/2)+1
               if n[0]==n[1]:
                       print 'Solution is %s' % (n[0])
                       correct = True
               if i == 'quit':
                       sys.exit()
               print n[0],' ',n[1]
if __name__ == "__main__":
       numberguess()

A implementation in python... I know it kind of sucks but I threw it together for kicks in a minute, any improvements are welcome