Use the Lua built-in example to learn about Lua 07 (31-35)

-- Example 31 --[[Standard LibrariesLua has standard built-in libraries for common operations inmath, string, table, input/output & operating system facilities.External LibrariesNumerous other libraries have been created: sockets, XML, profiling,logging, unittests, GUI toolkits, web frameworks, and many more.]]

-- Example 32 -- standard libraries-math.

-- Math functions:-- math.abs, math.acos, math.asin, math.atan, math.atan2,-- math.ceil, math.cos, math.cosh, math.deg, math.exp, math.floor,-- math.fmod, math.frexp, math.huge, math.ldexp, math.log, math.log10,-- math.max, math.min, math.modf, math.pi, math.pow, math.rad,-- math.random, math.randomseed, math.sin, math.sinh, math.sqrt,-- math.tan, math.tanhprint(math.sqrt(9), math.pi)-------- Output ------3 3.1415926535898

-- Example 33 -- standard libraries-string.

-- String functions:-- string.byte, string.char, string.dump, string.find, string.format,-- string.gfind, string.gsub, string.len, string.lower, string.match,-- string.rep, string.reverse, string.sub, string.upperprint(string.upper("lower"),string.rep("a",5),string.find("abcde", "cd"))-------- Output ------LOWER aaaaa 3 4

-- Example 34 -- standard libraries-table.

-- Table functions:-- table.concat, table.insert, table.maxn, table.remove, table.sorta={2}table.insert(a,3);table.insert(a,4);table.sort(a,function(v1,v2) return v1 > v2 end)for i,v in ipairs(a) do print(i,v) end-------- Output ------1 42 33 2

-- Example 35 -- standard libraries-input/output.

-- IO functions:-- io.close , io.flush, io.input, io.lines, io.open, io.output, io.popen,-- io.read, io.stderr, io.stdin, io.stdout, io.tmpfile, io.type, io.write,-- file:close, file:flush, file:lines ,file:read,-- file:seek, file:setvbuf, file:writeprint(io.open("file doesn't exist", "r"))-------- Output ------nil file doesn't exist: No such file or directory 2