Float sum with javascript

Question

Possible Duplicate:
Is JavaScript's Math broken?

I'm calculating the sum of several float values using javascript and... I've noticed a strange thing never seen before. Executing this code:

parseFloat('2.3') + parseFloat('2.4')

I obtain 4.699999999999999

So... what sould I do to obtain a correct value? (supposed that this is incorrect...)

Solution 1

Once you read what What Every Computer Scientist Should Know About Floating-Point Arithmetic you could use the .toFixed() function:

var result = parseFloat('2.3') + parseFloat('2.4');
alert(result.toFixed(2));​

Solution 2

(parseFloat('2.3') + parseFloat('2.4')).toFixed(1);

its going to give you solution i suppose

Comments

[Muhammad Musavi]

Simply use parseFloat((2.3 + 2.4).toFixed(10)) Here is the explanation

[Artem Fedotov]

Pay attention that toFixed(fractionDigits) returns a string

[Monzur]

this is not a real solutions whereas my numbers are different 1+1.2+1.25+4.5=???

[RobG]

@Monzur—you can do toFixed on the result: Number((1+1.2+1.25+4.5).toFixed(10)) will return a number. If you need more than 10 decimal places you might need to use BigInt instead.