variables

问题 Program public class Project_X { public static void main(String[] args){ byte x; int a=270; double b =128.128; System.out.println("int converted to byte"); x=(byte) a; System.out.println("a and x "+ a +" "+x); System.out.println("double converted to int"); a=(int) b; System.out.println("b and a "+ b +" "+a); System.out.println("n double converted to byte"); x=(byte) b; System.out.println("b and x "+b +" "+x); } } error get illegal character:\160 回答1: You copy-pasted the program code using a

问题 I recently wrote a class for an assignment in which I had to store names in an ArrayList (in java). I initialized the ArrayList as an instance variable private ArrayList<String> names . Later when I checked my work against the solution, I noticed that they had initialized their ArrayList in the run() method instead. I thought about this for a bit and I kind of feel it might be a matter of taste, but in general how does one choose in situations like this? Does one take up less memory or

问题 I'm trying to make an automated sum based on an increasing number of rows. Here is my sample of code but I'm stuck as I don't know the syntax to include a variable in the formula of a cell. Sheets("Orderboek").Select Range("H" & (rOi + 1)).FormulaR1C1 = "=Sum(H3:H"&rOi&")" My variables are declared as follows: Dim i As Integer, a As Range 'i= index a een gebied Dim prText As String 'product text Dim rOi As Long 'rij nummer in orderboek Dim rng, sumrng As Excel.Range Dim r As Long 'rij number

问题 I need to pick one .csv file from \\\Share\Folder\ with max filename for further import to SQL. File name is alphanumerical, e.g. ABC_DE_FGHIJKL_MNO_PQRST_U-1234567.csv , where numerical part will vary, but I need the only max one each time the package runs. Constraints: no write access on that SQL server, I use ##Temp table for import and this is the least desirable method for filename processing (no for each loops on this server). Ideally it will be function/expr-based variable (combined

问题 I just recently started learning Basics in Java, and was testing around initializing a string variable by concatenating primitive variables. public class Main{ public static void main(String[] args){ byte lbyte = 3; short lshort = 1; int lint = 1; long llong = 0; float lfloat = 2.0f; double ldouble = lfloat; char lchar = 'H'; boolean lbool = true; String lstring = " w0r1d "; String lOutput = lchar+lbyte+lshort+lint+llong+lstring+ldouble+' '+lbool; System.out.println(lOutput); } } In this code

问题 I have a lengthy menu script that relies on a few command outputs for it's variables. These commands take several seconds to run each and I would like to spawn new processes to set these variables. It would look something like this: VAR1=`somecommand` & VAR2=`somecommand` & ... wait echo $VAR1 $VAR2 The problem is that the processes are spawned and die with those variables they set. I realize that I can do this by sending these to a file and then reading that but I would like to do it without

问题 Hello I'm essentially trying to do this inside a new view window in SQL Server 2008: declare @var = (select db from databases); exec ('select name from ' + @var ' + .dbo.Names); This view actually runs in SQL Server but I cannot save it (it gives me an error), I could potentially just create a table returning function, do all of this same stuff in it and return the table and create a view that basically takes everything from that table but I was unsure of performance hits that could occur

问题 For loop with multiple variables in python 2.7. Hello, I am not certain how to go about this, I have a function that goes to a site and downloads a .csv file. It saves the .csv file in a particular format: name_uniqueID_dataType.csv. here is the code import requests name = "name1" id = "id1" dataType = "type1" def downloadData(): URL = "http://www.website.com/data/%s" %name #downloads the file from the website. The last part of the URL is the name r = requests.get(URL) with open("data/%s_%s_

问题 Currently developing a package that passes an expression from a previous date to a filename. The current code I have is the following as a string variable: (DT_WSTR,20)DATEPART("YYYY",Dateadd("DD",-1,dateadd("MM",datediff("MM", (DT_DATE) "1900-01-01",getdate())-2, (DT_DATE) "1900-01-01"))) + RIGHT("0"+(DT_WSTR,20)DATEPART("MM",Dateadd("DD",-1,dateadd("MM",datediff("MM", (DT_DATE) "1900-01-01",getdate())-5, (DT_DATE) "1900-01-01"))),2) + "01" This currently produces the output of: 20171101

问题 In my method, I declare some variables, including int blockCount; . I call this method more than once. Using the Xcode debugger, I found out that after the second time the method was called, the value of blockCount was set to 364265, while it was set to 2, just a few milliseconds earlier. It's not a real problem, since I can just set it to 0 or any other number I'd like, but is it bad programming habit to have a certain variable declared over and over again? I'm quite new to programming, and