This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 7 years ago.
In Javascript following number
9999999999999999.99
Gets converted in to
10000000000000000
How can I prevent this behaviour?
It's my understanding that the best way to deal with this is to do all your calculations in whole numbers, and divide by 100 (or plus as many zeros as needed) afterwards.
If you absolutely need to use decimals, this post contains a lot of useful information that should be of use to you.
Related
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Is it possible to achieve arbitrary-precision arithmetic with no rounding issues in JavaScript?
(1 answer)
javascript - More accurate value of Pi? [duplicate]
(2 answers)
Closed 4 years ago.
I'm trying to do some floating number calculation with javascript that requires high accuracy
when I tried to initiate a variable like this:
const pi = 3.141592653589793238462643383280
System will truncate number to
>pi
>3.141592653589793
How can I do calculating with long decimal digits? thanks!
You can use a library like say for example http://mikemcl.github.io/decimal.js/
This question already has answers here:
Parse Float has a rounding limit? How can I fix this?
(3 answers)
How to parse 20 digit number using JavaScript and jQuery
(3 answers)
Closed 2 years ago.
I want to convert a number having 20 precision and 2 scale value using parseFloat() function, but when the value of integer part and fractional part exceeds to 14 and 3 respectively (eg. 55555555555555.33552), its not working properly.
Can anyone tell me the reason behind this or correct me if I am wrong.
Thank you.
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 7 years ago.
Why is it that trying to add 2.05 with 1.01
returns this value?
console.log(2.05+1.01); // -> 3.0599999999999996?
is using toFixed() the only way around it?
console.log((2.05+1.01).toFixed(2))
How can I avoid this behavior, so it won't get me by surprise in the inner calculations of my code.
This is because javascript's floating point precision only goes up to 14 places. The only real ways around it are multiplying each number by a high number or doing what you said.
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 8 years ago.
When I multiply 3 * 1.1 in JavaScript instead of returning 3.3, it results in 3.30000000000000003, Why is this?
That's because numbers in computers are represented as floating point numbers, which have limited precision. Some operations will cause tiny errors and there's nothing you can do about that.
It's also a reason to never compare numbers using ==.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Huge Integer JavaScript Library
Suppose I want the exact value for 2^1000. How am I supposed to get the entire value? Maybe storing it in a string every time the multiplication is done, but it will still eventually go over 10 digits! Is there any way, or does ECMAScript just not support this?
Math.pow(2,1000)
returns
1.0715086071862673e+301
how accurate do you need this to be?