Trouble with decimals

[powelds]

I’m trying to figure out how to add 0.1 to a number, I can add 0.0 + 0.1 = 0.1 and then 0.1+0.1= 0.2 but then when I get to 0.2+0.1 =.3000000000004 and then the next addition maybe correct and after that, the next set would be off and then everything is off from there.

[josephxbrick]

Hi!

That is annoying behavior! You can use the toFixed() function on the result to guarantee a certain number of decimal places. E.g., for one decimal place:

Set text on (label) to [[ (Target.text + 0.1).toFixed(1) ]]

[powelds]

I have tried the .toFixed as well and still the same issue. I have tried a few different values,

1. [[var1+0.1]]
2. [[var1+0.1.toFixed(1)]]
3. [[var1+1/10.toFixed(1)]]

[powelds]

[[(var1+0.1).toFixed(1)]] solved the issue.

Thanks for all your help

[nkrisc]

More info if you’re interested:

4.1 - 0.1 = 3.9999999999999996 (Apparently)

This is a floating point math issue and is a common issue in computing when using floating point representations of decimals and is not unique to Axure. float - What causes floating point rounding errors? - Programmers Stack Exchange For example, try typing 4.1 - 0.1 in the console in your browser, you'll see the same thing. Or try 0.1 * 0.2. Same problem. I'm not sure what solutions there are. In other types of programming, you would usually avoid or mitigate the issue by using different …