string-length

I have a function which needs to encode strings, which needs to be able to accept 0x00 as a valid 'byte'. My program needs to check the length of the string, however if I pass in "\x00" to std::string the length() method returns 0. How can I get the actual length even if the string is a single null character? You're passing in an empty string. Use std::string(1, '\0') instead. Or std::string{ '\0' } (thanks, @zett42) std::string is perfectly capable of storing nulls. However, you have to be wary, as const char* is not, and you very briefly construct a const char* , from which you create the

I have been tasked with writing a Fortran 95 program that will read character input from a file, and then (to start with) simply spit it back out again. The tricky part is that these lines of input are of varying length (no maximum length given) and there can be any number of lines within the file. I've used do read( 1, *, iostat = IO ) DNA ! reads to EOF -- GOOD!! if ( IO < 0 ) exit ! if EOF is reached, exit do I = I + 1 NumRec = I ! used later for total no. of records allocate( Seq(I) ) Seq(I) = DNA print*, I, Seq(I) X = Len_Trim( Seq(I) ) ! length of individual sequence print*, 'Sequence

I want to find the longest VARCHAR in a specific column of a SQL Server table. Here's an example: ID = INT IDENTITY DESC = VARCHAR(5000) ID | Desc ---|----- 1 | a 2 | aaa 3 | aa What's the SQL to return 3? Since the longest value is 3 characters? aweis Use the built-in functions for length and max on the description column: SELECT MAX(LEN(DESC)) FROM table_name; Note that if your table is very large, there can be performance issues. for mysql its length not len SELECT MAX(LENGTH(Desc)) FROM table_name Watch out!! If there's spaces they will not be considered by the LEN method in T-SQL. Don't

Microsoft documentation states that this code will return 7 characters The Length property returns the number of Char objects in this instance, not the number of Unicode characters. string characters = "abc\u0000def"; Console.WriteLine(characters.Length); // Displays 7 I will need a function to return as result 12 because there are 12 different characters. Which function I may use? You would have to prevent the interpretation of the literal by the compiler. This can be done with the @ prefix, like this: var characters = @"abc\u0000def"; The Length property of this string will then return 12,

I've had severas problems with strings in access-vba. The thing is, access (sometimes) limit the string's length to about 255 characters. However, depending on HOW the string was built, it may be able to grow bigger then 255 chars. There's an example of WORKING code : Dim strReq as String strReq = "SELECT exampleField1, exampleField2, exampleField3, exampleField4, exampleField5 " strReq = strRec & ", exampleField6, exampleField7, exampleField8, .... [etc. insert many fields, you get it]" strReq = strReq & " FROM myTable INNER JOIN Tbl2 ON ...[many JOINs as well]" And so on, I often work with