def isfloat(x): try: a = float(x) except (TypeError, ValueError): return False else: return True def isint(x): try: a = float(x) b = int(a) except (TypeError, ValueError): return False else: return a == b
BigDecimal is immutable, any operation on it including setScale(2, BigDecimal.ROUND_HALF_UP) produces a new BigDecimal. Correct code should be BigDecimal bd = new BigDecimal(1); bd.setScale(2, BigDecimal.ROUND_HALF_UP); // this does change bd bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP); System.out.println(bd); output 1.00 Note – Since Java 9 BigDecimal.ROUND_HALF_UP has been deprecated and you should now use RoundingMode.ROUND_HALF_UP.
With a test script I’ve found a factor of less than 1.5. My code would look like: tmco = {‘NumHeaderLines’, 1 , … ‘NumColumns’ , 5 , … ‘ConvString’ , ‘%f’ , … ‘InfoLevel’ , 0 , … ‘ReadMode’ , ‘block’, … ‘ReplaceChar’ , {‘,.’} } ; A = txt2mat(filename, tmco{:}); Note the different ‘ReplaceChar’ … Read more
Implement the shouldChangeCharactersInRange method like this: // Only allow one decimal point // Example assumes ARC – Implement proper memory management if not using. – (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string]; NSArray *arrayOfString = [newString componentsSeparatedByString:@”.”]; if ([arrayOfString count] > 2 ) return NO; return YES; } This creates … Read more
You should use basic_ios::imbue to set the preferred locale. Take a look here: http://www.cplusplus.com/reference/ios/ios_base/imbue/ Locales allow you to use the preferred way by the user, so if a computer in Italy uses comma to separate decimal digits, in the US the dot is still used. Using locales is a Good Practice. But if you want … Read more
decimal module comes in handy. >>> from decimal import * >>> getcontext().prec = 100 >>> Decimal(2).sqrt() Decimal(‘1.414213562373095048801688724209698078569671875376948073176679737990732478462107038850387534327641573’)
According to the specification, a DecimalLiteral is defined as: DecimalLiteral :: DecimalIntegerLiteral . DecimalDigitsopt ExponentPartopt . DecimalDigits ExponentPartopt DecimalIntegerLiteral ExponentPartopt and for satisfying the parseFloat argument: Let inputString be ToString(string). Let trimmedString be a substring of inputString consisting of the leftmost character that is not a StrWhiteSpaceChar and all characters to the right of that … Read more
If you’re doing this to several fields, or doing it quite often, then perhaps a plugin is the answer. Here’s the beginnings of a jQuery plugin that formats the value of a field to two decimal places. It is triggered by the onchange event of the field. You may want something different. <script type=”text/javascript”> // … Read more
string.Format is your friend. String.Format(“{0:0.00}”, 123.4567); // “123.46”
Tip for CSV exports: SELECT REPLACE(CAST(prijs_incl AS CHAR), ‘.’, ‘,’) will give you input that can be used as numeric fields in european excelsheets.