This question already has answers here:
Javascript toFixed Not Rounding
(23 answers)
Closed 3 years ago.
I have a question regarding toFixed() function. I have some float numbers e.g. 160.325 and 5.325. The returned value of toFixed() function supposed to be 160.33 and 5.33 respectively but it returns 160.32 for 160.325 and 5.33 for 5.325.
I have tried in different ways,
Number(160.325).toFixed(2)
"160.32"
Number(160.326).toFixed(2)
"160.33"
Number(5.325).toFixed(2)
"5.33"
Number(160.425).toFixed(2)
"160.43"
I expect output to be 160.33 and 5.33.
MDN has added a warning for this unexpected behavior. You can read here
Floating point numbers cannot represent all decimals precisely in binary which can lead to unexpected results
Example:
2.35.toFixed(1); // Returns '2.4'. Note it rounds up
2.55.toFixed(1); // Returns '2.5'. Note it rounds down
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:
Is floating point math broken?
(31 answers)
Closed 1 year ago.
as the title
when I use toFixed to convert the float
(0.2).toFixed(4) -> 0.2000
(444.2).toFixed(4) -> 444.2000
(0.2).toFixed(14) -> 0.20000000000000
(444.2).toFixed(14) -> 444.19999999999999 //why ?!!!
I could not understand that what causes this result.
Is any javascript method to avoid this problem?
Floating point numbers cannot represent all decimals precisely in binary. one way to overcome this problem is using parseFloat:
console.log(parseFloat((444.2).toFixed(14)));
This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 4 years ago.
var tm=110;
var fm=200;
var pr=Math.ceil(tm/fm*100);
console.log(pr);
The result is showing 56.
But it should be 55
Note that
tm/fm*100 is resulting 55.0000001
But
When tm=100 and all fm=200 then the result is 50
I've solved that problem concedering upto 2 decimal places after point, I could not understand where from 1 is comming after some 0s!
Math.ceil() returns the smallest integer greater than or equal to a given number. See MDN Documentation.
Remove Math.ceil()
parseFloat() pr variable
Call Float's precision method toPrecision(8)
The extra 1 you are seeing is a result of binary floating point math. JavaScript does this. Source
<script>
var tm=110;
var fm=200;
var pr= parseFloat(tm/fm*100);
alert(pr.toPrecision(8)); // output: 55.00000000
</script>
This question already has answers here:
Why can't I access a property of an integer with a single dot?
(5 answers)
Closed 6 years ago.
the type of (8) and 8 are both numbers, but when called toString() method, (8) success but 8 failed, why?
The difference between having 8 and (8) is, the former is a plain number and the latter is a JavaScript Expression. The problem with the Exception is, the way you have written:
8.toString(2);
Here, the 8. is treated as a floating point or decimal, which causes the syntax error. Since it takes it as a decimal, giving a decimal yields the right result:
» 8.0.toString(2);
« "1000"
8.toString() // Won't work
Here . is treated as a floating point number representation. So if you want to convert a non floating point number into string just give a space after the number
8 .toString(); // Will work
And if it a floating point number then you can call toString directly
8.2.toString(); // Will work even it doesn't have the space
8..toString(); // Will also work
But I would recommend you to use parenthesis for code readability.
And a number wrapped in parenthesis is an expression.
This question already has answers here:
Large numbers erroneously rounded in JavaScript
(6 answers)
Closed 7 years ago.
I have the folowing code:
Click
function Add(id) {
alert(id);
}
The value in the alert is 23905762501722144 (-2) from the original value.
Why does this happen?
https://jsfiddle.net/wvtqostd/4/
log2(23905762501722146) ~= 54.408
JavaScript stores all numbers - including integers - as double precision floats. Double precision mantissa/significand contains 52 bits of information, so some information gets lost storing so long/precise number as you have.
Because 23905762501722144 is to big to represent as integer value... try sending it as string value.