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The first release of AutoCAD is purely written in C and some parts in assembly ,later extended to C++ , however AutoCAD has rich scale of wrappers exposed in AutoLISP, Visual LISP, VBA, .NET and JS.
Most probably C++ is the code language for developing Auto-cad and Solid Works.
I support answer of Mr. Muhammad Shakeel >>>>>>>>>>>>>>Thanks
Thank you for the invitation and agreed with the answers
ya i agree with mr shakeel answer
In most commom situation, you need to have AutoCAD installed. Once you have AutoCAD installed, you can access drawingdata inside AutoCAD's exe process (in-process application). This type of app can be written in various language AutoCAD supports: C++, .NET languages (VB.NET, C#, F#...), AutoLISP, AutoCAD VBA. You can also automate AutoCAD vir its COM API (.NET COM interop, or classical VB), or any COM-able language.
However, if you do not want to run AutoCAD in order to access drawing data, you need to get very expensive RealDwg SDK lisence, with which you can use C++ or .NET languages
