lua教程第一章-起点（Lua tutorial Chapter 1 - starting point）.docVIP

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lua教程第一章-起点（Lua tutorial Chapter 1 - starting point）.doc

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lua教程第一章-起点（Lua tutorial Chapter 1 - starting point）

lua教程第一章-起点（Lua tutorial Chapter 1 - starting point） Write one of the simplest programs -- Hello World. Print (Hello World) Suppose you save the above sentence in the hello.lua file, you just need it at the command line: Prompt Lua hello.lua See the result? Lets look at a slightly more complicated example: - defines, a, factorial, function Function fact (n) If n = 0 then Return 1 Else Return n * fact (n-1) End End Print (enter a number:) A = io.read (*number) -- read, a, number Print (fact (a)) This example defines a function that calculates the factorial of the input parameter n; this example asks the user to enter a numeric n, and then prints the factorial of the n. 1.1 Chunks Chunk is a series of statements, each statement executed by Lua, such as each file in a file or interactive mode, is a Chunk. The semicolon (()) at the end of each statement is optional, but if there are multiple statements on the same line, it is best to use; separate A = 1, B = a*2 -- ugly, but, valid A Chunk can be either a statement or a combination of a series of statements, or a function, and Chunk can be very large. In Lua, several MByte Chunk are common. You can also run Lua in interactive mode and run Lua: without parameters Lua 5, Copyright, 1994-2003, Tecgraf, PUC-Rio Each of the commands you type (such as: Hello World) after you hit enter immediately executed, operator can exit the interactive mode end of file (Ctrl-D in type Unix, Ctrl-Z, in, DOS/Windows) or os.exit (call OS Library) function can also exit. In interactive mode, Lua usually put each line as a Chunk, but if the Lua line is not a complete Chunk, he will continue to wait until you get the input of a complete Chunk. in Lua for continuation, show a different prompt (usually ). You can let Lua execute a series of Chunk by specifying parameters. For example, assume that a file a has a single statement x=1; the other file B has the statement print (x) Prompt Lua -la -lb The command first runs a in a Chunk, and then runs