Hi,

You can find C++ code solving biharmonic problem using Lagrange finite element basis functions at the following site

http://fenics.readthedocs.io/projects/dolfin/en/latest/demos/biharmonic/main.cpp.html

Hope this helps.

Thank you very much Prof. Egoyan. It will be more beneficial for me if you could suggest some non-software based code link for this problem which I could run in terminal (Linux etc.) and edit as I like.

Dear Gouranga,

You can use libmesh finite element library http://libmesh.github.io/

They have a source code for download

The solution of biharmonic equation can be found at

http://libmesh.github.io/examples/adaptivity_ex4.html

Hope it helps.