This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 1 year ago.
I hope theres a javascript expert that can help.
I am trying to round numbers to 2 decimal places
example
3.342 = 3.34
4.565 = 4.57
means from the third digit is 5 and above to round to the next decimal, and with no change below 5
I have something like
var num = Math.round(n*100)/100
and it works for other numbers but not for
n = 4.225 which rounded would be 4.23
and because I couldn't find the issue I printed
n*100 this is
4.225*100 and it turns I got 422.49999999999994 instead of 422.5
and that explains why Math.round gives me 4.22 instead of 4.23.
please, can anybody give some light on this issue?
This is happening with other numbers too and I have no solution yet.
I also added math.Epsilon like
(n+math.Epsion) * 100
You can use Math.round combined with toFixed to solve your problem:
console.log(Math.round((4.225*100).toFixed(1)) / 100)
Related
This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 1 year ago.
I am trying to find the value of the 4th decimal place and check if it is a zero or not. If not I was planning on throwing an error message. For example 2.3189. I need to be able to check the value of the 4th decimal which in this case is 9. This is the code I have thus far. It seemed to be working for majority of cases but for example 1.2570. When I do the check for this number it says that the 0 is not a 0. When I do the same check with 1.2580 it says that the 0 is a 0. Any help with this would be greatly appreciated.
!!(submission && (quantity * 10000 % 10) === 0);
I'd do regex checking 4th place after '.' to be zero
var number = 0.554156;
/\.[0-9]{3}0/.test(number.toString())
You could make use of javascript expression for accessing the 4th decimal place since modulus operator has precision issues.
const quantity = 1.2570;
console.log(Number(quantity.toFixed(4).split('.')[1][3]));
This question already has answers here:
Truncate number to two decimal places without rounding
(43 answers)
Closed 5 years ago.
I'm trying to get the first decimals of a float number without any kind of rounding.
Example:
var myfloat = 1.1864526;
myfloat = myfloat.toFixed(2);
It returns 1.19 but I need 1.18.
I'm pretty sure there is an easy solution but I am unable to find it without converting the number to a string (not useful in this case).
Multiply the float value by 100, get the int value of the result then divide that int by 100. Something like this should work:
((int)(myFloat*100)) / 100
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Closed 5 years ago.
I am facing weird issue during rounding the value using javascript. Some of the value is not rounding in correct format.
var n =17.955 ;
var roundedPrice;
roundedPrice = Math.round(n*100)/100;
console.log(roundedPrice); // It returns 17.95 instead of 17.96
It is happening for some specific values like 16.955, 17.955, 18.955, 19.955. Except these values like 1.955, 12.955, 20.955, 27.955 ... This round function return correct values.
Edited : It is happening with 17.955 only. This returns correct result with 17.9555 ( 3 times 5).
Thanks in advance.
You can use either Math.ceil() to get the expected result.
This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 7 years ago.
Why does javascript returns so many zeros and not just 0.24
And how can i disable javascript to do this. Because when im using a calculator i never get the result 0.24000000000002
var sum = (0.0001 * 2400);
result 0.2400000000002
The reason for this is that your sum is a float which are known to not be very precise. This is a limitation of float values.
To fix this you need to round the decimals by either Math.round or .toFixed.
javascript always do that but you can make it show only 2 digits after the dot.
var sum = (0.0001 * 2400);
alert(sum.toFixed(2));
This question already has answers here:
How to round to at most 2 decimal places, if necessary
(91 answers)
Closed 8 years ago.
I have the following number
0.135
I'd like to round it to 2 decimal places, I'm using...
(newCostDiff/2).toFixed(2)
only this returns
0.13
Can anyvody advise me on how to do this?
What's need of jquery
var newCostDiff = 0.135;
Math.round(newCostDiff *100)/100; //returns 0.14
You should first multiply the result by 10^(number of decimals), then round the number, than divide this number by 10^(number of decimals).
In this case:
Math.round((newCostDiff/2)*100) / 100;