Lua string formatting and decimal places

[Rhobox]

Hello!

Has anyone found a good way to print or set tooltips (or any other numbers) to only a certain number of decimal places in Lua yet? The string.format() option always just returns the minimum number it seems to be able to.

Integer math doesn't work super well either as it is prone to floating point issues.

Example: Turn 99.9978434% to 100.00% or 13.5584759% to 13.56%


Thanks!

 

[JsonDalao]

function NewRound(decimal)
local decimal = math.floor((decimal*100)+0.5)*0.01
return decimal
end

function NewRound1(decimal)
local aa,bb = math.modf(decimal*100);
local cc=string.sub(bb,3,3);
local dd=string.sub(aa,string.len(aa),string.len(aa));
if cc=="5" and dd%2==0 then
print(aa*0.01)
else
print(NewRound(decimal));
end
end

It can help you?

 

[Rhobox]

I had been running with something similar to that until I asked. One problem I was facing is that since lua represents things in floating point form all the time, it can't always accurately represent real numbers. Resulting in something similar to below where it's 98.35001 instead of the real representation of 98.35:

 

[Tasyen]

In Warcraft 3 Lua you have to inser 2% into string.format or os.date.
Like

TimerStart(CreateTimer(), 0.0, false, function()
    print(string.format( "%%.2f", 1/3 ))
    print(string.format( "%%.5f", 1/7 ))
    print(string.format( "%%.2f", 1/23 ))
    print(string.format( "%%.2f", 98.3322313145868866465 ))
    print(os.date("%%Y-%%m-%%d"))
end)

 

[Rhobox]

Hahahaha of course you do. You are a godsend Tasyen. Most of my UI work is from your tutorials anyway.

You are doing great work, frankly I probably wouldn't have gotten this far without you. I appreciate it.

Edit: Your response worked great. Correctly formats the string.