Javascript console.log huge number [duplicate] - javascript

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)
Closed 5 years ago.
In javascript, why
console.log(99999999999999999)
results to
100000000000000000
TIA

Because your number is too large for javascript.
See here the Number.MAX_SAFE_INTEGER constant

Javascript can't handle number over 2^53 - 1 without rounding errors
see
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
I suggest you use Strings for big numbers

Related

Weird result in decimal math operation in Javascript [duplicate]

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Is floating point math broken?
(31 answers)
Closed 4 years ago.
Hi I am doing following operation in Javascript and I am getting weird results, can someone tell me what is going on.
5.62-6.18+0.56 = 4.440892098500626e-16
Because of floating point inaccuracies, the result isn't exactly zero. JavaScript uses scientific notation to display numbers as small as this one. You might be interested in the toPrecision() method.

Incorrect Calc in JavaScript [duplicate]

This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Is floating point math broken?
(31 answers)
Closed 5 years ago.
I'm trying to run the following calculation in JavaScript, 78.98 * 10 and the result returned is always 789.8000000000001 My question is where did that 0.0000000000001 come from?
I tried on several calculators, and that 0.0000000000001 should not be there. I did inclusive tests in other programming languages.
My question is, is there a logical explanation for this? If it is an error in the JavaScript engine where I notify?
Thank you.

JavaScript parseInt is giving me wrong number, what I'm doing wrong? [duplicate]

This question already has answers here:
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
Closed 29 days ago.
So, for parseInt('10152547376283911', 10) I'm expecting 10152547376283911, but I'm getting 10152547376283912.
What I'm doing wrong?
Javascript native numbers do not have enough precision (significant digits) to hold the number you are expecting. See the question What is the standard solution in JavaScript for handling big numbers (BigNum)? for suggestions on how to deal with this problem.
Depending on your application, you may actually be able to use strings instead of numbers (for example, if your number represents something like a physical part number). You would only need a bigint library if you intend to do arithmetic on your numbers.

JavaScript Number Insanity [duplicate]

This question already has answers here:
Large numbers erroneously rounded in JavaScript
(6 answers)
Closed 8 years ago.
I have this number in javascript - 1234567890123456789
This number is apparently a magical number, because when interpreted the lowest two digits magically turn into zeros!!!!!!! Run it through the console and you get this: 1234567890123456800
But wait - theres more. try out this number: 12345678901234568999
Console outputs 12345678901234570000
What is going on here? Have I finally lost my mind or is this some sort of cosmic joke?
Numbers in JavaScript are floating point numbers. As such, integers/numbers above a certain value are prone to precision errors, as you have experienced first hand.
Any number larger than Number.MAX_SAFE_INTEGER, or 9007199254740991, is going to experience precision issues. That is, only integers up to 15 digits are guaranteed to be exact.

Why is a number having greater than 15 digits auto rounded in javascript? [duplicate]

This question already has answers here:
Large numbers erroneously rounded in JavaScript
(6 answers)
Closed 9 years ago.
I have a problem with javascript number. My problem is that I have a currency field in HTML and when I use javascript to calculate with another field; then if this input field has the number of digits > 15 then this is auto rounded.
You can try this in firebug. E.g:
(9999999999999999);
10000000000000000
How do I fix this?
You have a currency field that you care is rounding past 9999999999999999??
I'm impressed right there :P
It's a limitation of having large floating point numbers. There's no easy way to fix it short of getting a bigint javascript library, I'm sure there's a few out there. But honestly, why do you care?

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