QuickLuaTour翻译流水账(31-38)

-- Example 31   --[[

  Standard Libraries

  Lua has standard built-in libraries for common operations in
  math, string, table, input/output & operating system facilities.

  External Libraries

  Numerous other libraries have been created: sockets, XML, profiling,
  logging, unittests, GUI toolkits, web frameworks, and many more.

]]

------- Output --------


-- 例子 31   --[[
  标准库

  Lua 有许多用于通用操作的标准的内建库，比如数学
  字符串，表，输入/输出和操作系统的工具

  外部库

  现有的其它的库有N多：sockets, XML, 性能分析，
  日志，单元测试，图形界面工具，web框架等等

]]


-- Example 32  -- Standard Libraries - math.

-- Math functions：
-- math.abs, math.cos, 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.tanh

print(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.upper

print(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.sort

a={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      4
2      3
3      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:write

print(io.open("file doesn't exist", "r"))


------ Output ------

nil     file doesn't exist: No such file or derectory   2


-- Example 36  -- Standard Libraries - operating system facilities.

-- OS functions:
-- os.clock, os.date, os.difftime, os.execute, os.exit, os.getenv,
-- os.remove, os.rename, os.setlocale, os.time, os.tmpname

print(os.date())

------ Output ------

06/20/12 11:48:30


-- Example 37  -- External Libraries
-- Lua has support for external modules using the 'require' function
-- INFO:A dialog will popup but it could get hidden behind the console.

require("iuplua")
ml = iup.multiline
    {
        expand="YES",
        value="Quit this multiline edit app to continue Tutorial!",
        border="YES"
    }

dlg = iup.dialog{ml; title="IupMultiline", size="QUARTERxQUARTER",}
dlg:show()
print("Exit GUI app to continue!")
iup.MainLoop()


------ Output --------
Exit GUI app to continue!


-- Example 38   --[[
  to learn more about Lua scripting see
  Lua Tutorials: http://lua-users.org/wiki/TutorialDirectory
  "Programing in Lua" Book: http://www.inf.puc-rio.br/~reberto/pil2/

  Lua 5.1 Reference Manual:
      Start/Programs/Lua/Documentation/Lua 5.1 Reference Manual

  Examples Start/Programs/Lua/Examples
]]


------ Output -------

]]