local Onumber = io.read() -- used for checks !!! DO NOT CHANGE THIS !!!
local number = Onumber
local SubE 
local PostE 

if not Onumber or Onumber:match("^%s*$") then
    print("No input provided")
    os.exit(0)
end











-- Stage 1 (1e303 Limit)

function round()
    number = tonumber(number)
    number = (math.floor(number * 100) / 100)
end

function abv()
    local AmntE = 0
    number = tonumber(number)
    if number > 1e303 then
        print("Greater than 1e300")
        os.exit(0)
    end
    while true do
        number = number / 10
        AmntE = AmntE + 1
        if number < 10 then
            break
        end
    end
    round()
    ConvertedNum = tostring(number .. "e" .. AmntE)
    print(ConvertedNum)
end

-- Stage 2 (Beyond 1e303 to infinity)

local Onumber2 = io.read()

local Numbers = {
    [1] = {var = Onumber, SubE = "", PostE = ""},
    [2] = {var = Onumber2, SubE = "", PostE = ""},
}

function CheckE()
    for _,v in pairs(Numbers) do
        e = string.find(v.var, 'e')
        e = e - 1
    end
end

function findE()
    CheckE()
    if e > 1 then
        print("Only 1 'e' can be used")
        return
    end
    for _,v in pairs(Numbers) do 
        v.SubE = tonumber(string.sub(v.var, 1, string.find(v.var, 'e') - 1))
        v.PostE = tonumber(string.sub(v.var, string.find(v.var, 'e') + 1)) 
    end
end

function SolveForE()
        if SubE2 >= 10 then
        while true do
            SubE2 = SubE2 / 10
            PostE2 = PostE2 + 1
            if SubE2 < 10 then
                break
            end
        end
    end
end

-- Stage 3 (Addition)

function Addition() 
    findE()
    SubE2 = tonumber(Numbers[1].SubE) + tonumber(Numbers[2].SubE)
    if Numbers[1].PostE > Numbers[2].PostE then
        PostE2 = Numbers[1].PostE
    elseif Numbers[1].PostE < Numbers[2].PostE then
        PostE2 = Numbers[2].PostE 
    else
        PostE2 = Numbers[1].PostE
    end
    SolveForE()
    print(SubE2 .. "e" .. PostE2 .. ": Addition")
end

-- Stage 4 (Subtraction)

function Subtraction() -- REDO THIS AS SOON AS POSSIBLE
    findE()
    SubE2 = tonumber(Numbers[1].SubE) - tonumber(Numbers[2].SubE)
    if Numbers[1].PostE < Numbers[2].PostE then
        PostE2 = Numbers[1].PostE
    elseif Numbers[1].PostE > Numbers[2].PostE then
        PostE2 = Numbers[2].PostE 
    else
        PostE2 = Numbers[1].PostE
    end
    SolveForE()
    print(SubE2 .. "e" .. PostE2 .. ": Subtraction")
end

-- Stage 5 (Multiplication)

function Multiplication() 
    findE()
    SubE2 = tonumber(Numbers[1].SubE) * tonumber(Numbers[2].SubE)
    PostE2 = tonumber(Numbers[1].PostE) + tonumber(Numbers[2].PostE)
    SolveForE()
    print(SubE2 .. "e" .. PostE2 .. ": Multiplication")
end

-- Stage 6 (Division)

function Division() 
    findE()
    SubE2 = tonumber(Numbers[1].SubE) / tonumber(Numbers[2].SubE)
    PostE2 = tonumber(Numbers[1].PostE) - tonumber(Numbers[2].PostE)
    SolveForE()
    SubE2 = (math.floor(100*(SubE2))/100)
    print(SubE2 .. "e" .. PostE2 .. ": Division")
end

-- Stage 7 (Power) [ this took WAY to long to figure out ]

function ToPower() 
    findE()
    StringSub = tostring(Numbers[1].SubE)
    StringSub = tonumber(StringSub:sub(1, 1))
    SubE2 = StringSub ^ tonumber(Numbers[2].SubE)
    PostE2 = tonumber(Numbers[1].SubE * 10 ^ Numbers[1].PostE) + tonumber(Numbers[2].SubE * 10 ^ Numbers[2].PostE)
    SolveForE()
    print(SubE2 .. "e" .. PostE2 .. ": Power")
end

-- !!! KEEP AT BOTTOM !!!

function ValuePrint()
    print(Numbers[1].SubE .. "e" .. Numbers[1].PostE .. ": Number 1")
    print(Numbers[2].SubE .. "e" .. Numbers[2].PostE .. ": Number 2")
    Addition() Subtraction() Multiplication() Division() ToPower() 
end

if not string.find(number, 'e') then
     abv()
else 
    findE()
    ValuePrint()
end