Octal equivalent in C#
No, there are no octal number literals in C#. For strings: Convert.ToInt32(“12”, 8) returns 10.
numbers
Prevent negative inputs in form input type=”number”?
This uses Javascript, but you don’t have to write your own validation routine. Instead just check the validity.valid property. This will be true if and only if the input falls within the range. <html> <body> <form action=”#”> <input type=”number” name=”test” min=0 oninput=”validity.valid||(value=””);”><br> <input type=”submit” value=”Submit”> </form> </body> </html>
HTML input type=”number” still returning a string when accessed from javascript
It’s normal you get a string. The purpose of the number type is that mobile browsers use this for showing the right keyboards and some browsers use this for validation purposes. For example the email type will show a keyboard with the @ and ‘.’ on the keyboard and number will show a numeric keyboard.
Convert Java Number to BigDecimal : best way
This is fine, remember that using the constructor of BigDecimal to declare a value can be dangerous when it’s not of type String. Consider the below… BigDecimal valDouble = new BigDecimal(0.35); System.out.println(valDouble); This will not print 0.35, it will infact be… 0.34999999999999997779553950749686919152736663818359375 I’d say your solution is probably the safest because of that.
Why does double in C print fewer decimal digits than C++?
With MinGW g++ (and gcc) 7.3.0 your results are reproduced exactly. This is a pretty weird case of Undefined Behavior. The Undefined Behavior is due to using printf without including an appropriate header, ¹violating the “shall” in C++17 §20.5.2.2 ” A translation unit shall include a header only outside of any declaration or definition, and … Read more
How to extract the decimal part from a floating point number in C?
You use the modf function: double integral; double fractional = modf(some_double, &integral); You can also cast it to an integer, but be warned you may overflow the integer. The result is not predictable then.
how to display a javascript var in html body
Try This… <html> <head> <script> function myFunction() { var number = “123”; document.getElementById(“myText”).innerHTML = number; } </script> </head> <body onload=”myFunction()”> <h1>”The value for number is: ” <span id=”myText”></span></h1> </body> </html>
Get number of digits before decimal point
Solution without converting to string (which can be dangerous in case of exotic cultures): static int GetNumberOfDigits(decimal d) { decimal abs = Math.Abs(d); return abs < 1 ? 0 : (int)(Math.Log10(decimal.ToDouble(abs)) + 1); } Note, that this solution is valid for all decimal values UPDATE In fact this solution does not work with some big … Read more
How do I round a number in JavaScript?
If you need to round to a certain number of digits use the following function function roundNumber(number, digits) { var multiple = Math.pow(10, digits); var rndedNum = Math.round(number * multiple) / multiple; return rndedNum; }
Convert string to decimal number in ruby
You call to_i, you get integer. Try calling to_f, you should get a float. For more string conversion methods, look here.