This question already has answers here:
How to deal with big numbers in javascript [duplicate]
(3 answers)
Closed 8 years ago.
If I use the windows calculator to calculate
(1.75 + 3/1.75)/2 it yields to =
1,7321428571428571428571428571429
If I do the same with javascript it yields to
1.732142857142857206298458550009
So at position 22 after the decimal point the result becomes incorrect ...142857... vs. ...206298...
var a = 1.75;
var res = (a+3/a)/2;
console.log(res.toFixed(30));
How can I make my division precise for 31 digits after the decimal comma?
Javascript can't do that "per se", since its double variables have a limited precision. You'll need to use an external library to handle operations with big precision numbers, like this one: Javascript Bignum
Related
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 24 days ago.
When I execute the JavaScript code 8/(3-8/3), the result is displayed as 23.99999999999999, but I want to fix it to 24.
In order not to round numbers when they are not repeating decimals or when their repetend is not 9 (e.g. do not round 21.835 to 22; do not round 2.979797979797 to 3), how should I solve this problem?
There doesn't seem to be a clear way to resolve this issue without using some sort of rounding function, but there are alternative ways to write this specific equation, according to MathsIsFun
E.g.
8/(1/3)
This question already has answers here:
BigDecimal in JavaScript
(5 answers)
Why max digits with decimal in JavaScript are only 16
(2 answers)
Closed 4 months ago.
i am working on a Web3 project where i have a balance of tokens which i want to burn. The problem that the amount of balance is in this format
0.29806008728157019
So when i pass this amount to the burn method it loss its precision and it becomes
0.2980600872815702
I've tried many things like converting it to big number before passing it as a parameter like this
web3.utils.toBN( Math.trunc(amount * 1000000000000000000) );
i tried to convert it to a string then use parseFloat like this:
const value = web3.utils.toBN(
Math.trunc(parseFloat(amount) * 1000000000000000000)
);
But none of these worked.
Any help please ?
This question already has answers here:
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
Large numbers erroneously rounded in JavaScript
(6 answers)
javascript large integer round because precision? (why?)
(2 answers)
Closed 1 year ago.
So, I found something I couldn't understand and can't find any internet resource that explains it.
Please see the code below:
var num = 35422484817926290
// subtract 5 from num
console.log(num-5)
Output (Wrong) : 35422484817926284
I checked it in Node, Opera, and Chrome, all of them give the wrong answers.
I do understand the fact that arithmetic with unsafe Integers in JS is faulty, for example:
console.log(100000000000000005-1)
Output (Wrong) : 100000000000000000
So what's the deal with big number arithmetic in JS?
When I run this code:
var num = 35422484817926290
// subtract 5 from num
console.log(num-5)
in Visual Studio Code, i get the following warning:
"Numeric literals with absolute values equal to 2^53 or greater are too large to be represented accurately as integers."
So the correct way to make this calculation would be like this:
var num = 35422484817926290n
// subtract 5 from num
console.log(num-5n)
JavaScript is not faulty, this is how the Floating point arithmetic works. Looks duplicate to this post. For better calculation involving floating-point numbers you should use BigNumber API.
This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 8 years ago.
I am performing a basic calculation using javascript and when I use this combination of number it won't calculate correctly:
alert((40071.13 + 6028.91) - 46100.04);
It should calculate to 0 but it doesn't. All other number combinations work for me.
Help!
This is a rounding issue. Try this to round to 2 decimal places
var num = (40071.13 + 6028.91) - 46100.04;
alert(num.toFixed(2));
See it in action on jsFiddle
This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 8 years ago.
I've got the following problem when i'm counting in javascript.
var processAmount = parseFloat(166.98) - parseFloat(61.58);
The result is: 105.39999999999999
Doesnt matter if I use parseFloat() or not.
How can I solve this?
Sometimes floats numbers cannot be represented exactly in binary.
Try this:
var processAmount = parseFloat(166.98) - parseFloat(61.58);
processAmount.toFixed(2);
FROM: Javascript float subtract