Use the Lua built-in example to learn about Lua 06 (26-30)

-- Example 26 -- functions.

-- Define a function without parameters or return value.function myFirstLuaFunction()print("My first lua function was called")end-- Call myFirstLuaFunction.myFirstLuaFunction()-------- Output ------My first lua function was called

-- Example 27 -- more functions.

-- Define a function with a return value.function mySecondLuaFunction()return "string from my second function"end-- Call function returning a value.a=mySecondLuaFunction("string")print(a)-------- Output ------string from my second function

-- Example 28 -- more functions.

-- Define function with multiple parameters and multiple return values.function myFirstLuaFunctionWithMultipleReturnValues(a,b,c)return a,b,c,"My first lua function with multiple return values", 1, trueenda,b,c,d,e,f = myFirstLuaFunctionWithMultipleReturnValues(1,2,"three")print(a,b,c,d,e,f)-------- Output ------1 2 three My first lua function with multiple return values1 true

-- Example 29 -- variable scoping and functions.

-- All variables are global in scope by default.b="global"-- To make local variables you must put the keyword 'local' in front.function myfunc()local b=" local variable"a="global variable"print(a,b)endmyfunc()print(a,b)-------- Output ------global variable local variableglobal variable global

-- Example 30 -- formatted printing.

-- An implementation of printf.function printf(fmt, ...)io.write(string.format(fmt, ...))endprintf("Hello %s from %s on %s\n",os.getenv"USER" or "there", _VERSION, os.date())-------- Output ------Hello there from Lua 5.1 on 04/06/13 16:16:02