Any C interpreter written in C++ can be compiled with MingW. All that varies is the amount of work you need to do to port it. There are no free C interpreters I am aware of that come out-of-the-box with a no-brain-required compilation process for MingW.
Embedded Ch claims to build using MingW but it is a commercial product.

Is it possible to link the cursor of a plaintextedit to an Interpreter??
Yes, you can write your program to extract text from your text edit and send it to an interpreter.