parsefloat

When I am adding two textbox values that are 1.001 and 0.001 and then I do a parseFloat I get 1.0019999999 . I want it 1.002 . Can you help me? 17 of 26 The Javascript Number class has a toFixed() function that will get you what you want. So you could do parseFloat("1.0019999").toFixed(3) and that would give you 1.002 . The parameter (3 in this case) is the number of digits to show after the decimal point 0.002 cannot be accurately represented as a base 2 number. Similar to the way that 1/3 can't be represented in base 10. 1/3 = 0.33333... recuring. To represent the number accurately in base

I wrote a function that behaves differently depending on the numeric type of it's parameters. Integer or float. Using some code from this question How do I check that a number is float or integer? it was easy to detect if float or not but then I stumbled upon the case that javascript casts 1.0 to 1 without cause if you call a function using that number. Example: function dump(a, b) { console.log(a, typeof b, b); } dump('1', 1); dump('1.0', 1.0); dump('1.1', 1.1); Output chrome, firefox, ie, opera and safari all gave the same result: 1 number 1 1.0 number 1 "wrong" 1.1 number 1.1 I know that

In this font-size resizing tutorial: Quick and easy font resizing the author uses parseFloat with a second argument, which I read here: parseFloat() w/two args Is supposed to specify the base of the supplied number-as-string, so that you can feed it '0x10' and have it recognized as HEX by putting 16 as the second argument. The thing is, no browser I've tested seems to do this. Are these guys getting confused with Java? No, they're getting confused with parseInt() , which can take a radix parameter. parseFloat() , on the other hand, only accepts decimals. It might just be for consistency, as

I searched and only found this one related to my question, but not exactly the same, as I'm using toFixed rather than toPrecision. Why does toPrecision return a String? Here is my code var oldv = parseFloat(document.getElementById('total').textContent).toFixed(2); alert(typeof oldv); // returns string var testv = parseInt(document.getElementById('total').textContent); alert(typeof testv); // returns number I need further math steps, so string type messed up... Why? How to solve? TIA As mentioned in docs, toFixed returns A string representing the given number using fixed-point notation In case

When I pull the values I want to multiply, they're strings. So I pull them, parse them as floats (to preserve the decimal places), and multiply them together. LineTaxRate = parseFloat(myRate) * parseFloat(myQuantity) * parseFloat(myTaxRateRound); This has worked for 99% of my invoices but I discovered one very odd problem. When it multiplied: 78 * 7 * 0.0725 Javascript is returning: 39.584999999999994 When you normally do the math in a calculator its: 39.585 When all is said and done, I take that number and round it using .toFixed(2) Because Javascript is returning that number, it's not