Calling individual functions

[melance2000@... (Lance Boudreaux)]

This may be a bit of a novice question but I only recently began using Lua.  I would like to know if anyone could provide me with some sample code showing how a function is read and called if it inside a lua file from C or C++.  I can get Lua to execute a file but I would like to make library like files that can be called from C++.  As an example, a function that calculates Miles to KM.  I would like to simply call the function from C++ and receive the answers on the stack.

thanks,
Lance
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