On Dec 1, 2006, at 8:24 PM, Hung Dao wrote: > First , please have a look at this : > http://www.carljohansen.co.uk/fourfours/ or google for the terms "four > fours" > I do not know C sharp ,so that i cant read the solution in that > page , but > my idea is that I will subtitude every operator + - * / until I get > the > result in a recursive way , but it will take a long time and CPU usage > > Do you know any solution for this in the most rubish way Some of the techniques used in solving this Ruby Quiz could be helpful with your problem: http://www.rubyquiz.com/quiz7.html James Edward Gray II