Lua for loop

function hi()

    print("Type a number, any number: ")
    maxInt = io.read()
    print(maxInt)

    print("What should you count by: ")
    step = io.read()
    print(step)

    for i = 0, maxInt, step do
        io.write("hi ".." maxInt: "..maxInt.."    step: "..step.."   i: ",i,"\n")
        -- it appears .. and , do the same thing

    end
end

hi ()