C++ coding for a mathematical model (coupled system of differential equations)

Hi, I have a system of 10 coupled differential equations. Also there are some variables and parameters in them. I need to solve this system for each value of input variable. I have the entire model documented in word and have also in Matlab. In Matlab I used ode45 to solve the system of differential equations. There are limitations to using the solvers in Matlab and so I want to get the mathematical model coded in C++ or C. I think there will be more possible options of solvers in those languages. If you want I can send the word document and the matlab code and then maybe explain in more detail on Skype. Maybe that is the procedure to get to know, if you can do the job, how much you will charge and how long you might take. Bye, Kaushik.