Always returning incorrect simple math lua

问题

I have a very basic Lua script that asks a math question

math.randomseed(os.time())
        print ("Let's play Math")
        a = math.random(1,10)
        b = math.random(1,10)
        io.write("What is " .. a .. " + " .. b .. "?")
        answer = io.read()
        correct = (a + b)
            if (answer == correct) then
                print ("Correct")
            else
                print ("Wrong")
                print (correct) --For debug
            end

For some reason, I am always getting "incorrect" even when answered correctly. I also print out the correct answer, just to make sure the program is handling the math correctly. Where is my mistake?

回答1:

answer contains a string and so is never equal to a number.

Just add

    answer = tonumber(answer)

after

    answer = io.read()

来源：https://stackoverflow.com/questions/43532017/always-returning-incorrect-simple-math-lua