Can someone explain to me what is the difference between variable intValue.Value and intValue?

so i've made a script. But there is a problem. The variable b1 and b2 which is a intValue.Value when i run the function, the variable jawaban is 0. Here is the script

local jawaban
local b1 = script.parent.B1.B.Value
local b2 = script.parent.B2.B.Value
local oper = script.Parent.O:FindFirstChildWhichIsA("BoolValue")
local pilihan
local function calculate()
	if oper.Name == "x" then
		jawaban = b1 * b2
	elseif oper.Name == "+" then
		jawaban = b1 + b2
	elseif oper.Name == "-" then
		jawaban = b1 - b2
	end
	print(jawaban)
end
calculate()

the output will be

0

but when i change the b1 and b2. Like this

local jawaban
local b1 = script.parent.B1.B
local b2 = script.parent.B2.B
local oper = script.Parent.O:FindFirstChildWhichIsA("BoolValue")
local pilihan
local function calculate()
	if oper.Name == "x" then
		jawaban = b1.Value * b2.Value
	elseif oper.Name == "+" then
		jawaban = b1.Value + b2.Value
	elseif oper.Name == "-" then
		jawaban = b1.Value - b2.Value
	end
	print(jawaban)
end
calculate()

the output wont be zero. Why this is happen?, btw this script is a local script

Seems fine to me. the code i used is i put the script inside Staterpack with your extra values inside folders in the same Starterpack object.

Folder Structure:

Game
|----StarterPack
	\-----B1 -- Folder
		\-----B	-- IntValue
	\-----B2 -- Folder
		\-----B	-- IntValue
	\-----O -- Folder
		\-----x -- BoolValue
\---------LocalScript

Code:

wait(2)
local jawaban
local b1 = script.parent.B1.B
local b2 = script.parent.B2.B
local oper = script.Parent.O:FindFirstChildWhichIsA("BoolValue")
local pilihan
local function calculate()
    if oper.Name == "x" then
		jawaban = b1.Value * b2.Value
    elseif oper.Name == "+" then
		jawaban = b1.Value + b2.Value
    elseif oper.Name == "-" then
		jawaban = b1.Value - b2.Value
    end
    print(jawaban)
end
calculate()

Output:

  0

The only thing I can think why you're getting different values for your sum object is grabbing the value on script run, theres a chance when you grab the "live" values in your calculate() function these values change.

Example:

ObjA.Value = 0


local ObjA = script.Parent.ObjA
local ObjB = script.Parent.ObjB
local a = ObjA.Value
local b = ObjB.Value

Another script Connected to these values can change the values before your calculate() function has chance to run

Another script:

local ObjA = script.Parent.ObjA
ObjA.Value = 1

Your calculate function() reads these values as 0 since its recoded on run.

Whereas:

ObjA.Value = 0


local ObjA = script.Parent.ObjA
local ObjB = script.Parent.ObjB
local a = ObjA
local b = ObjB.Value

Other script:

local ObjA = script.Parent.ObjA
ObjA.Value = 1

Your calculate function() reads these as it executes and it sees ObjA.Value as 1 since another script has changed it

a little spin on your code to make it a bit more user-friendly. Though it does make it a bit more complex lol.

Code:

wait(2)
local jawaban
local b1 = script.parent.B1.B
local b2 = script.parent.B2.B
local oper = script.Parent.O:FindFirstChildWhichIsA("BoolValue")
local pilihan

local execute = { 
	Opers = {
	['+'] = function (x, y) return x + y,"Pass" end,
	['-'] = function (x, y) return x - y,"Pass" end,
	['/'] = function (x, y) -- you would need to check to see if the use isn't dividing by zero!
		if(x == 0 or y == 0) then
			return 0, "Divide by Zero Event!"
		end
		return x / y, "Pass"
	end, 
	['*'] = function (x, y) return x * y,"Pass" end,
	}
}
function execute:DoDaMath(x,y,op)
	local chk = self.Opers[op]
	if(chk ~= nil) then
		return self.Opers[op](b1.Value, b2.Value)
	end
	return "Error!","Error ["..op.."] is not Valid!"	
end

local function calculate()
	local jawaban,ErrorCode = execute:DoDaMath(b1.Value,b2.Value,oper.Name)
	print(jawaban,ErrorCode)
end
calculate()

The code returns 2 values, the result from your two sums and an Error code, the error code returns if the sum works and if there's a case for the dreaded divide by zero. It also checks to see if your operator is also valid.