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Alexander 2017-09-29 04:39:12 +03:00 • committed by GitHub
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1-js/05-data-types/02-number/article.md
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@ -249,10 +249,10 @@ Can we work around the problem? Sure, there're a number of ways:
2. We can temporarily turn numbers into integers for the maths and then revert it back. It works like this:
```js run
alert( (0.1*10 + 0.2*10) / 10 ); // 0.3
alert( (0.1 * 10 + 0.2 * 10) / 10 ); // 0.3
```
This works because when we do `0.1*10 = 1` and `0.2 * 10 = 2` then both numbers become integers, and there's no precision loss.
This works because when we do `0.1 * 10 = 1` and `0.2 * 10 = 2` then both numbers become integers, and there's no precision loss.
3. If we were dealing with a shop, then the most radical solution would be to store all prices in cents and use no fractions at all. But what if we apply a discount of 30%? In practice, totally evading fractions is rarely feasible, so the solutions above help avoid this pitfall.
@ -270,7 +270,7 @@ JavaScript doesn't trigger an error in such events. It does its best to fit the
````
```smart header="Two zeroes"
Another funny consequence of the internal representation of numbers is the existance of two zeroes: `0` and `-0`.
Another funny consequence of the internal representation of numbers is the existence of two zeroes: `0` and `-0`.
That's because a sign is represented by a single bit, so every number can be positive or negative, including a zero.