This first edition was written for Lua 5.0. While still largely relevant for later versions, there are some differences.
The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.
By buying the book, you also help to support the Lua project.
|Programming in Lua|
|Part I. The Language Chapter 4. Statements|
An if statement tests its condition and executes its then-part or its else-part accordingly. The else-part is optional.
if a<0 then a = 0 end if a<b then return a else return b end if line > MAXLINES then showpage() line = 0 endWhen you write nested ifs, you can use elseif. It is similar to an else followed by an if, but it avoids the need for multiple ends:
if op == "+" then r = a + b elseif op == "-" then r = a - b elseif op == "*" then r = a*b elseif op == "/" then r = a/b else error("invalid operation") end
|Copyright © 2003–2004 Roberto Ierusalimschy. All rights reserved.|