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**1D advection-diffusion--need to check my code; any suggestions?**

Hi everyone:

I am teaching myself transport/programming, and have created a simple program for 1-D advection-diffusion (constant velocity, diffusion coefficient, central differencing, Crank-Nicolson).

I would like to check that my code is working properly and would appreciate any advice about how to go about this. I have not been successful on Google at finding code that others have written... If anyone can direct me or provide advice about getting an analytical solution, I would be very grateful. An EXCEL-based spreadsheet or a Matlab or a c++ implementation would be useful; I am not a Fortran or C user.