In a C app when I call a Lua script, do the variables in the code stay with the same value when I call the script again later?
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In a C app when I call a Lua script, do the variables in the code stay with the same value when I call the script again later?
They will still exist in the lua state you created until you close that state. The variables are tied to the state not the script file.
edit
As noted in the comments local variables will be garbage collected when they go out of scope. A further caveat is that Lua supports closures and upvalues so the scope may not always be completely obvious.