How to round .999999999998 numbers

[Denys_Developer (Developer)]

i have a issue with a text label inputting numbers like this

local time = script.Parent.Bar.Value.Value
local waittime = script.Parent.Value.Value

if script.Parent.Visible == true then
	while wait(0.1) do
		time = time - 0.1
		script.Parent.Bar.Size = UDim2.new(time / waittime, 0, 1, 0)
		script.Parent.Bar.TextLabel.Text = string.format(time.." Seconds Left")
		if time <= 0 then
			script.Parent.Visible = false
			print("finished")
			script.Parent.Parent.Parent.Parent.ScreenGui.Finishe.Visible = true
			wait(5)
			script.Parent.Parent.Parent.Parent.ScreenGui.Finishe.Visible = false
		end
	end
end

[vf9r]

I don’t know if it will change much, but since time is a global function just like print, you may want to change the variable “time” to like “clock” or something not already defined

[Denys_Developer (Developer)]

nothing is wrong with the code, its just the number its inputting

[vf9r]

In that case, I found a post that might entail what you are looking for based on your title

Rounding Number to Nearest Whole

Hi! Using a number value, I need to round it’s value to the nearest whole number since I use decimals for a multiplication sequence. How could I do this so that, for example, a value of 10.001010894124312 becomes just 10. Thanks!

[Erex_147 (Erex)]

the way I interpret it, you want to round it to numbers like 2.9, 2.8 correct?

[Denys_Developer (Developer)]

yes‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎

[NormalDeveloperX]

Use math.round()

Extra characters

[Erex_147 (Erex)]

it will round to the nearest integer, not 0.1 decimal

[Denys_Developer (Developer)]

dont you need to put in every you want to round for math.round?

[Gamer539099 (nexvon)]

Just use

math.round()

function, to round numbers.

Example:

print(math.round(1.9999)) --> 2

[Denys_Developer (Developer)]

i want numbers to be rounded to the nearsest tenth not whole, also i have like a few hundred different numbers, and it goes through every one

[Katrist]

Use string.format.

Code:

local timer = script.Parent.Bar.Value
local waittime = script.Parent.Value

if script.Parent.Visible then
	while task.wait(0.1) do
		timer.Value = string.format("%0.1f", timer.Value - 1)
		script.Parent.Bar.Size = UDim2.fromScale(timer.Value / waittime.Value, 1)
		script.Parent.Bar.TextLabel.Text = timer.Value .." Seconds Left"
		
		if timer.Value <= 0 then
			script.Parent.Visible = false
			print("finished")
			script.Parent.Parent.Parent.Parent.ScreenGui.Finishe.Visible = true
			
			task.wait(5)
			script.Parent.Parent.Parent.Parent.ScreenGui.Finishe.Visible = false
		end
	end
end

There are a few problems with your script that I also fixed.

1. You should be using task.wait instead of wait
2. You were changing the variable that stored .Value, not the actual .Value.

[Maelstorm_1973]

This should work for you.

number = math.floor(number * 10) / 10

This takes the number, multiplies it by 10, floors it, then divides it by 10. I had round, but 29.9999 would round to 30. Floor basically truncates the fractional part by returning the biggest integer equal to or smaller than the number you give it.

[HugeCoolboy2007 (omega)]

Adding onto what @Maelstorm_1973 said, you can set it into a function:

local function RoundNumber(number: number, places: number): number
   return math.round(number * (10^places)) / (10^places)
end

print(RoundNumber(1/3, 2)) --> prints "0.33"
print(RoundNumber(math.pi, 4)) --> prints "3.1416"
print(RoundNumber(1.4627365728, 1)) --> prints "1.5"

[Denys_Developer (Developer)]

@Katrist

string.format("%0.1f", timer.Value - 1)

not related but how would you replace %0.1 to %1 without it just breaking, i need it for a different part of my game

	daysSinceStart = string.format("%1f", secondsElapsedSinceStart / 7200)

[Katrist]

That’s not how you use string.format. You have to specify the amount of decimals, so it would be:

daysSinceStart = string.format("%0.0f", secondsElapsedSinceStart / 7200)

[Maelstorm_1973]

@Katrist @Denys_Developer

Actually, you’re both wrong. It follows the printf format from C. The correct way is

local text = string.format("%5.1f", timer.Value - 1)

That gives you a total of 5 digits, with one digit to the right of the decimal. The first number is the total space needed. The second number is how much of that is past the decimal point. If that first number is not specified, then it’s whatever the integer part is.

FreeBSD Manual Pages OS 13.2-RELEASE: printf(3)

Here’s Roblox’s own documentation on the matter.

string | Documentation - Roblox Creator Hub