type-conversion - w3toppers.com

How to convert UTF-8 byte[] to string

string result = System.Text.Encoding.UTF8.GetString(byteArray);

NumPy or Pandas: Keeping array type as integer while having a NaN value

NaN can’t be stored in an integer array. This is a known limitation of pandas at the moment; I have been waiting for progress to be made with NA values in NumPy (similar to NAs in R), but it will be at least 6 months to a year before NumPy gets these features, it seems: … Read more

Signed to unsigned conversion in C – is it always safe?

Short Answer Your i will be converted to an unsigned integer by adding UINT_MAX + 1, then the addition will be carried out with the unsigned values, resulting in a large result (depending on the values of u and i). Long Answer According to the C99 Standard: 6.3.1.8 Usual arithmetic conversions If both operands have … Read more

Convert integer to hexadecimal and back again

// Store integer 182 int intValue = 182; // Convert integer 182 as a hex in a string variable string hexValue = intValue.ToString(“X”); // Convert the hex string back to the number int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber); from http://www.geekpedia.com/KB8_How-do-I-convert-from-decimal-to-hex-and-hex-to-decimal.html HINT (from the comments): Use .ToString(“X4”) to get exactly 4 digits with leading 0, or .ToString(“x4”) … Read more

Convert a Unicode string to a string in Python (containing extra symbols)

See unicodedata.normalize title = u”Klüft skräms inför på fédéral électoral große” import unicodedata unicodedata.normalize(‘NFKD’, title).encode(‘ascii’, ‘ignore’) ‘Kluft skrams infor pa federal electoral groe’

How do I convert from int to String?

Normal ways would be Integer.toString(i) or String.valueOf(i). The concatenation will work, but it is unconventional and could be a bad smell as it suggests the author doesn’t know about the two methods above (what else might they not know?). Java has special support for the + operator when used with strings (see the documentation) which … Read more

What does “Incompatible types: void cannot be converted to …” mean?

Quick answer The compiler is telling you that your code is trying to use the “result” of a method that doesn’t return a result. Solution: Read the javadoc for the method you are trying to call (or the source code if you don’t have javadocs). From the javadocs (or source code), work out how the … Read more

Converting a String to DateTime

Since you are handling 24-hour based time and you have a comma separating the seconds fraction, I recommend that you specify a custom format: DateTime myDate = DateTime.ParseExact(“2009-05-08 14:40:52,531”, “yyyy-MM-dd HH:mm:ss,fff”, System.Globalization.CultureInfo.InvariantCulture);