Try the following expression: ^\d+\.\d{0,2}$ If you want the decimal places to be optional, you can use the following: ^\d+(\.\d{1,2})?$ EDIT: To test a string match in Javascript use the following snippet: var regexp = /^\d+\.\d{0,2}$/; // returns true regexp.test(‘10.5’)
Historical note: the comment thread below may refer to first and second implementations. I swapped the order in September 2017 since leading with a buggy implementation caused confusion. If you want something that maps “0.1e-100” to 101, then you can try something like function decimalPlaces(n) { // Make sure it is a number and use … Read more
Multiply it by four, round it as you need to an integer, then divide it by four again: x = Math.Round (x * 4, MidpointRounding.ToEven) / 4; The various options for rounding, and their explanations, can be found in this excellent answer here 🙂
What about this: hex(dec).split(‘x’)[-1] Example: >>> d = 30 >>> hex(d).split(‘x’)[-1] ‘1e’ By using -1 in the result of split(), this would work even if split returned a list of 1 element.
It’s not a JS problem but a more general computer one. Floating number can’t store properly all decimal numbers, because they store stuff in binary For example: 0.5 is store as b0.1 but 0.1 = 1/10 so it’s 1/16 + (1/10-1/16) = 1/16 + 0.0375 0.0375 = 1/32 + (0.0375-1/32) = 1/32 + 00625 … … Read more
all numbers are stored in binary. if you want a textual representation of a given number in binary, use bin(i) >>> bin(10) ‘0b1010’ >>> 0b1010 10
The default decimal separator depends on the locale used. You can set it in 2 ways: On a per-view basis by the locale attribute of the <f:view> tag: <f:view locale=”#{bean.locale}”> On a per-converter basis by the locale attribute of the <f:convertNumber> tag: <f:convertNumber locale=”#{bean.locale}” /> It’s unclear what locale you’re targeting, but the use of … Read more
It can be useful to represent a number including its accuracy – so 0.5m could be used to mean “anything between 0.45m and 0.55m” (with appropriate limits) and 0.50m could be used to mean “anything between 0.495m and 0.545m”. I suspect that most developers don’t actually use this functionality, but I can see how it … Read more
The type of a literal without the m suffix is double – it’s as simple as that. You can’t initialize a float that way either: float x = 10.0; // Fail The type of the literal should be made clear from the literal itself, and the type of variable it’s assigned to should be assignable … Read more
In fact CultureInfo.InvariantCulture can be used here. The parameter expects IFormatProvider, an interface that CultureInfo implements. But InvariantCulture is invariant in the sense that it does not vary with the user’s settings. In fact, there is no culture that accepts either , or . as decimal separator – they are all one or the other. … Read more