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Messing with tables

https://love2d.org./forums/viewtopic.php?t=80093

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Messing with tables

Posted: Mon Apr 27, 2015 12:26 pm
by Periwasmarkedasspam
Hello! Today im creating some "Trivial" game, and im having problems with a table. Im getting this error
Error: Syntax error: questions.lua:42: unexpected symbol near '='

stack traceback:
[C]: ?
[C]: in function 'require'
main.lua:2: in main chunk
[C]: in function 'require'
[string "boot.lua"]:331: in function <[string "boot.lua"]:227>
[C]: in function 'xpcall'
Yes a strange "unexpected symbol" but i dont think is my fault, cause it still work on Windows (Love 0.9.0), but when i get in my Linux pc (Love 0.8.0) this keep failing. This is my code:

Code: Select all

--Table Defs.

questions = {}
	questions[1] = {} --Tier1
		questions[1][1] = {} --Q1
			questions[1][1][1] = "¿Qué profesion tenia Torre Isunza?" --Question1
			questions[1][1][2] = "Escultor" --Ans1
			questions[1][1][3] = "Escritor" --Ans2
			questions[1][1][4] = "Pintor" --Ans3
			questions[1][1][5] = 1 --RightAnswer
		questions[1][2] = {} --Q2
			questions[1][2][1] = "¿En qué año nació Torre Isunza?" --Question1
			questions[1][2][2] = "1734" --Ans1
			questions[1][2][3] = "1892" --Ans2
			questions[1][2][4] = "1987" --Ans3
			questions[1][2][5] = 2 --RightAnswer
		questions[1][3] = {} --Q3
			questions[1][3][1] = "¿En qué año murió Torre Isunza?" --Question1
			questions[1][3][2] = "2011" --Ans1
			questions[1][3][3] = "1982" --Ans2
			questions[1][3][4] = "1945" --Ans3
			questions[1][3][5] = 2 --RightAnswer
	questions[2] = {} --Tier2
		questions[2][1] = {} --Q1
			questions[2][1][1] = "QuestionTest2" --Question1
			questions[2][1][2] = "arrayAns12" --Ans1
			questions[2][1][3] = "arrayAns22" --Ans2
			questions[2][1][4] = "arrayAns32" --Ans3
			questions[2][1][5] = 2 --RightAnswer
		questions[2][2] = {} --Q2
			questions[2][2][1] = "QuestionTest2" --Question1
			questions[2][2][2] = "arrayAns12" --Ans1
			questions[2][2][3] = "arrayAns22" --Ans2
			questions[2][2][4] = "arrayAns32" --Ans3
			questions[2][2][5] = 2 --RightAnswer
		questions[2][3] = {} --Q3
			questions[2][3][1] = "¿En qué años ganó la primera y segunda medalla Torres Isunza?" --Question1
			questions[2][3][2] = "1989 y 1999" --Ans1
			questions[2][3][3] = "1890 y 1930" --Ans2
			questions[2][3][4] = "1922 y 1930" --Ans3
			questions[2][3][5] =  --RightAnswer
	questions[3] = {} --Tier3
		questions[3][1] = {} --Q3
			questions[3][1][1] = "QuestionTest3" --Question1
			questions[3][1][2] = "arrayAns13" --Ans1
			questions[3][1][3] = "arrayAns23" --Ans2
			questions[3][1][4] = "arrayAns33" --Ans3
			questions[3][1][5] = 3 --RightAnswer
		questions[3][2] = {} --Q3
			questions[3][2][1] = "QuestionTest3" --Question1
			questions[3][2][2] = "arrayAns13" --Ans1
			questions[3][2][3] = "arrayAns23" --Ans2
			questions[3][2][4] = "arrayAns33" --Ans3
			questions[3][2][5] = 3 --RightAnswer
		questions[3][3] = {} --Q3
			questions[3][3][1] = "QuestionTest3" --Question1
			questions[3][3][2] = "arrayAns13" --Ans1
			questions[3][3][3] = "arrayAns23" --Ans2
			questions[3][3][4] = "arrayAns33" --Ans3
			questions[3][3][5] = 3 --RightAnswer
clues = {}

--Define some Question values

questionNumber = 1
actualQuestion = "Test"
actualAns1 = "true"
actualAns2 = "false1"
actualAns3 = "false2"
actualRealAns = 1

questionTier = 1

function retrieveQuestion(questionTier)
	questionNumber = math.random(1)
	actualQuestion = questions[questionTier][questionNumber][1]
	actualAns1 = questions[questionTier][questionNumber][2]
	actualAns2 = questions[questionTier][questionNumber][3]
	actualAns3 = questions[questionTier][questionNumber][4]
	actualRealAns = questions[questionTier][questionNumber][5]
end
Any clue :D

Re: Messing with tables

Posted: Mon Apr 27, 2015 12:41 pm
by Nixola

Code: Select all

         questions[2][3][5] =  --RightAnswer
   questions[3] = {} --Tier3
The above are the lines 41 and 42 of your code. The problem here is that questions[2][3][5] = is missing the righthand value. Lua thinks you wrote this:

Code: Select all

questions[2][3][5] = questions[3]
= {}

Re: Messing with tables

Posted: Mon Apr 27, 2015 4:24 pm
by s-ol
Periwasmarkedasspam wrote:Hello! Today im creating some "Trivial" game, and im having problems with a table. Im getting this error

Code: Select all

--Table Defs.

questions = {}
	questions[1] = {} --Tier1
		questions[1][1] = {} --Q1
			questions[1][1][1] = "¿Qué profesion tenia Torre Isunza?" --Question1
			questions[1][1][2] = "Escultor" --Ans1
			questions[1][1][3] = "Escritor" --Ans2
			questions[1][1][4] = "Pintor" --Ans3
			questions[1][1][5] = 1 --RightAnswer
		questions[1][2] = {} --Q2
			questions[1][2][1] = "¿En qué año nació Torre Isunza?" --Question1
			questions[1][2][2] = "1734" --Ans1
			questions[1][2][3] = "1892" --Ans2
			questions[1][2][4] = "1987" --Ans3
			questions[1][2][5] = 2 --RightAnswer
		questions[1][3] = {} --Q3
			questions[1][3][1] = "¿En qué año murió Torre Isunza?" --Question1
			questions[1][3][2] = "2011" --Ans1
			questions[1][3][3] = "1982" --Ans2
			questions[1][3][4] = "1945" --Ans3
			questions[1][3][5] = 2 --RightAnswer
	questions[2] = {} --Tier2
		questions[2][1] = {} --Q1
			questions[2][1][1] = "QuestionTest2" --Question1
			questions[2][1][2] = "arrayAns12" --Ans1
			questions[2][1][3] = "arrayAns22" --Ans2
			questions[2][1][4] = "arrayAns32" --Ans3
			questions[2][1][5] = 2 --RightAnswer
		questions[2][2] = {} --Q2
			questions[2][2][1] = "QuestionTest2" --Question1
			questions[2][2][2] = "arrayAns12" --Ans1
			questions[2][2][3] = "arrayAns22" --Ans2
			questions[2][2][4] = "arrayAns32" --Ans3
			questions[2][2][5] = 2 --RightAnswer
		questions[2][3] = {} --Q3
			questions[2][3][1] = "¿En qué años ganó la primera y segunda medalla Torres Isunza?" --Question1
			questions[2][3][2] = "1989 y 1999" --Ans1
			questions[2][3][3] = "1890 y 1930" --Ans2
			questions[2][3][4] = "1922 y 1930" --Ans3
			questions[2][3][5] =  --RightAnswer
	questions[3] = {} --Tier3
		questions[3][1] = {} --Q3
			questions[3][1][1] = "QuestionTest3" --Question1
			questions[3][1][2] = "arrayAns13" --Ans1
			questions[3][1][3] = "arrayAns23" --Ans2
			questions[3][1][4] = "arrayAns33" --Ans3
			questions[3][1][5] = 3 --RightAnswer
		questions[3][2] = {} --Q3
			questions[3][2][1] = "QuestionTest3" --Question1
			questions[3][2][2] = "arrayAns13" --Ans1
			questions[3][2][3] = "arrayAns23" --Ans2
			questions[3][2][4] = "arrayAns33" --Ans3
			questions[3][2][5] = 3 --RightAnswer
		questions[3][3] = {} --Q3
			questions[3][3][1] = "QuestionTest3" --Question1
			questions[3][3][2] = "arrayAns13" --Ans1
			questions[3][3][3] = "arrayAns23" --Ans2
			questions[3][3][4] = "arrayAns33" --Ans3
			questions[3][3][5] = 3 --RightAnswer
clues = {}
Your question format is also terribly redundant, you only need to write one third as much for the exact same results. Read this about nested table literals: http://www.lua.org/pil/3.6.html

Code: Select all

questions = {
    {
       {"¿Qué profesion tenia Torre Isunza?", "Escultor", "Escritor", "Pintor", 1},
       {"¿En qué año nació Torre Isunza?", "1734", "1892", "1987", 2},
       {"¿En qué año murió Torre Isunza?", "2011", "1982", "1945", 2}
     },
    {
       {"QuestionTest2", "arrayAns12", "arrayAns22", "arrayAns32", 2},
       {"QuestionTest2", "arrayAns12", "arrayAns22", "arrayAns32", 2},
       {"¿En qué años ganó la primera y segunda medalla Torres Isunza?", "1989 y 1999", "1890 y 1930", "1922 y 1930" <YOUR ERROR WAS HERE>}
    },
    {
       {"QuestionTest3", "arrayAns13", "arrayAns23", "arrayAns33", 3 },
       {"QuestionTest3", "arrayAns13", "arrayAns23", "arrayAns33", 3 },
       {"QuestionTest3", "arrayAns13", "arrayAns23", "arrayAns33", 3 }
    }
}
See how much easier to read and edit that is?

I would also advise to use a format that is a little more verbose you your don't confuse the indices (was the correct answer question[4] or question[5]???):

Code: Select all

questions = {
  {
    { question = "What is the most recent stable release of the LÖVE framework?", correct = 2, answers = { "0.8.1", "0.9.2", "10.0.0" } },
    { question = "What is the most recent stable release of the LÖVE framework?", correct = 2, answers = { "0.8.1", "0.9.2", "10.0.0" } },
    { question = "What is the most recent stable release of the LÖVE framework?", correct = 2, answers = { "0.8.1", "0.9.2", "10.0.0" } }
  },
  {
    { question = "asd", correct = 4, answers = { "bla", "bleh", "blergh", "rem" } },
    ......
  }
}
This is not only much easier to read and use, it also easily allows variable amount of answers (the "asd" question has 4 answers, the others have three, and you can tell just by #q.answers).

Code: Select all

local tier = 1
for _, q in ipairs(questions[tier]) do
  print(q.question)
  for _,a in ipairs(q.answers) do
    print( a )
  end
  local answer = q.read()
  print( "correct answer: " .. q.answers[q.correct] )
  if tonumber(answer) == q.correct then
    print( "you got it right!" )
  end
end
look how self-explanatory that example is!

Re: Messing with tables

Posted: Mon Apr 27, 2015 10:02 pm
by Periwasmarkedasspam
Thanks!! :D You saved my day!
This is a good community, not like other lua programmer places...
Thanks again! :awesome: :awesome: :awesome:

Re: Messing with tables

Posted: Mon Apr 27, 2015 10:18 pm
by I~=Spam
Yes you should write tables the way S0lll0s said. There are a lot a reasons. The code is easier to read. But also the table is initialized faster because lua can declare the table all at once.

Re: Messing with tables

Posted: Tue Apr 28, 2015 1:49 am
by s-ol
I~=Spam wrote:Yes you should write tables the way S0lll0s said. There are a lot a reasons. The code is easier to read. But also the table is initialized faster because lua can declare the table all at once.
Also errors like The one you experienced are much easier to find and when you modify a question or move it to another spot it's simply copy&paste instead of changing indices all over the place.
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