Here is a very simple program which uses the CLR classes to write out the value of the square root of two:
require 'CLRPackage'
import "System"
Console = luanet.import_type "System.Console"
Math = luanet.import_type "System.Math"
Console.WriteLine("sqrt(2) is {0}",Math.Sqrt(2))
The first task
for any LuaInterface program is to load any assemblies needed, and
the second task is to import the types. In this case, the
Console and
Math classes are loaded
explicitly, and we call their static methods
WriteLine and
Sqrt.LuaInterface
will convert Lua numbers and strings into their .NET equivalents
for us.
Like all hello programs, it is basically silly; the equivalent pure Lua program is of course just this one-liner:
print("sqrt(2) is "..math.sqrt(2))
But these techniques will be used to bring all the considerable power of the .NET framework into Lua programs, like the ability to easily write good-looking GUI applications, examine running processes, etc.