Math addition(+) looks weird

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#1

I’ve been trying to play with the math function and I found something strange.


https://gyazo.com/38b125d10e3c0ebb26aa3728339f4667
this looks good
so basically you add 1 + 0.7 + 0.09 which makes it 1.79
Most of the time, it does work very well.

However,

https://gyazo.com/d34da32a5255406001b8ddc0c4ddca2f

2 + 0.8 + 0.01 = ???
This seemed weird so I thought I’d post this.

Are there any ways to make it 2.8 or 2.81??

this is my code:

				local randomnum = math.random(1, 100)
				local randomsecond = math.random(9) / 10
				local randomthird = math.random(9) / 100
#2

Thats floating point imprecision, something about how computers handle numbers with decimals

#3

These accuracies are more visible with decimal numbers since the entire float cannot replicate the number on the binary. This applies especially to non-integers. Without it, the machine will try to approximate as close to the number that can be done on the binary sequence.

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