I just bombed an interview and made pretty much zero progress on my interview question. Given a number, find the next higher number which has the exact same set of digits as the original number. For example: given 38276 return 38627 I wanted to begin by finding the index of the first digit (from the … Read more
I want to check if a string contains only digits. I used this: var isANumber = isNaN(theValue) === false; if (isANumber){ .. } But realized that it also allows + and -. Basically, I want to make sure an input contains ONLY digits and no other characters. Since +100 and -5 are both numbers, isNaN() … Read more
What I would like is a method to convert a double to a string which rounds using the half-up method – i.e. if the decimal to be rounded is 5, it always rounds up to the next number. This is the standard method of rounding most people expect in most situations. I also would like … Read more
Use setRoundingMode, set the RoundingMode explicitly to handle your issue with the half-even round, then use the format pattern for your required output. Example: DecimalFormat df = new DecimalFormat(“#.####”); df.setRoundingMode(RoundingMode.CEILING); for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) { Double d = n.doubleValue(); System.out.println(df.format(d)); } gives the output: 12 123.1235 0.23 0.1 2341234.2125 EDIT: … Read more
