Math error with javascript [duplicate] - javascript

This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 7 years ago.
I just noticed the strangest problem with simple addition in javascript.
I have a simple equation that I am doing:
-1.000+(1.001) and the answer should be .001 however I am getting 0.0009999999999998899 instead. I can't understand why this is happening and there doesn't seem to be any way to get the right answer. I've check with multiple calculators and they all give me .001 but javascript gives me this crazy number.
What is going on? This isn't right. The number is very close but it is completely wrong. I've tried with other decimals values and I get strange results. How can javascript not do math properly?
Here is the simple alert box I used:
alert(1.000-(1.001));

try it with toFixed() method.
var erg = 1.000-(1.001)
alert(erg.toFixed(3));

Related

Weird result in decimal math operation in Javascript [duplicate]

This question already has answers here:
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.

Floating point arithmetic in Javascript [duplicate]

This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Is JavaScript's Math broken?
I have just started playing around with Javascript in the last couple of days and I have noticed something that appears to be quite peculiar. When I add some numbers together, I end up with a marginally incorrect answer.
4.99 + 0.98 = 5.970000000000001
Why does this happen?
I invite you to read "What Every Computer Scientist Should Know About Floating-Point Arithmetic".
You can use sprintf like this:
console.log(sprintf("%.2f", (4.99 + 0.98))); // 5.97

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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