-- 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 -------
]]
