Angular2 / Typescript : Wrong Result in Easy multiplication

Asked May 14 '18 at 16:38

Active May 14 '18 at 16:38

Viewed 20 times

I have two variables of type number:

row.priceList
row.markUp

And a simple multiplication:

row.priceList = row.pricePurchase * row.markUp;

Why if I set pricePurchase to 1500 and markUp ad 2.3, the result is 3449.9999999999995 ?!

This is just a simple formula, with plain values...

Thanks to support

asked May 14 '18 at 16:38

DarioN1

Try by using number(row.pricePurchase) * number(row.markUp); – Abel Valdez May 14 '18 at 16:41
No way, I number() is not typescript function – DarioN1 May 14 '18 at 16:44
It works in typescript too. – Abel Valdez May 14 '18 at 16:45
I don'w know but I can't compile Abel – DarioN1 May 14 '18 at 16:47
take look [link](https://stackoverflow.com/a/36134133/6651984) – Abel Valdez May 14 '18 at 16:48
@AbelValdez If you open a console 1500*2.3 = 3449.999999..995, A solution might be `Math.round(1500*2.3)` this is a limitation of double arithmetic in all double implementatons, not just JS, as is stated in the duplicate – Titian Cernicova-Dragomir May 14 '18 at 16:48
1

Turns out that 2.3 is not a "plain value" when represented in binary. The situation is similar to representing 2/7 in decimal. – Henry May 14 '18 at 17:27

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