Untitled

function GenerateQuestion()
        local numbers = 3 -- Amount of numbers the question will have.
        local numberMin = -20 -- Lower limit for the number randomization.
        local numberMax = 20 -- Upper limit for the number randomization.
        local asterisks = 0 -- Number of multiplication operators (a chunk later on ensures that there's only one multiplication).
        local signs = {'+', '-', '*'} -- Available operators.
        question = "" -- The question which the function will output.

        for i = 1, numbers, 1 do -- Generates random numbers and formats them into the question string.
                local number = tostring(math.random(numberMin, numberMax)) -- Generates a random number within the specified limits.

                if i < numbers then -- Ensures that an operator is only placed after a number if the number is not the last in the sequence.
                        local sign = signs[math.random(1, #signs)] -- Randomly picks an operator.
                        if sign == '*' then
                                asterisks = asterisks + 1 -- Increments the number of multiplication operators.
                        end
                        if tonumber(number) < 0 then
                                number = "("..number..")" -- Adds parentheses around a number if it's negative.
                        end
                        question = question..number.." "..sign.." " -- Concatenates the number and sign onto the question string.

                else -- Gets called once the loop reaches the last number, and doesn't place an operator after the number.
                        if tonumber(number) < 0 then
                                number = "("..number..")" -- Adds parentheses around a number if it's negative.
                        end
                        question = question..number -- Concatenates the number onto the question string.
                end
        end

        if asterisks > 1 then
                        question = question:gsub('*', signs[math.random(1, #signs - 1)], numbers - 2) -- Ensures that there's only one multiplication.
        end

        return question -- Returns the final question string.
end

function EvaluateQuestion()
        local s = "solution = "..question -- Concatenates the question string onto an assignment syntax.
        RunString(s) -- Parses the code contained in s, and calculates the value of the solution variable.
        return solution -- Returns the solution to the question.
end

function PrintQuestion()
        print(GenerateQuestion())
        print(EvaluateQuestion())
end

timer.Create("timer", 120, 0, PrintQuestion)
concommand.Add("generate_question", PrintQuestion)