how to modify CLANG AST and to convert it back to C code

Hi,
I am new to LLVM-CLANG. I want to do some transformations on CLANG
generated AST and I want to convert it back to the C source code. Can
anybody help me regarding this.

Thanks,
Sachin

You should probably ask on the cfe-dev list for more details. The short version of the answer is that you can choose to either use the pretty printers, or the rewriters. Both have different tradeoffs.

-Chris