syntax-error

问题 Im trying to read a row of information from a DB and write that out to a txt file. I have most of it figured out, but I get the following error "A field initializer cannot reference the non-static field, method, or property 'reader_writer.filewriter.filePath'" and I dont know why. Can someone please explain my problem? using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Data.SqlClient; using System.Data.Common; namespace reader

问题 I'm trying a very, very simple QT networking program. For some reason it crashes when executing without any error message, since it's not printing out any of the outputs to the command line as expected. Here's the code: qtTCPservertest.pro QT += core QT += network QT -= gui TARGET = qtTCPservertest CONFIG += console CONFIG -= app_bundle TEMPLATE = app SOURCES += main.cpp \ theserver.cpp HEADERS += \ theserver.h theServer.h #ifndef THESERVER_H #define THESERVER_H #include <QTcpServer> #include

问题 public static int biggestArrayGap(int []a, int n) { int biggestGap = Math.abs(a[1]-a[0]); for (int i=1; i<n-1; i++) { if (Math.abs(a[i]-a[i-1]) > biggestGap) Math.abs(a[i]-a[i-1]) = biggestGap; } return biggestGap; } For some reason, the second line in the if statement is returning as unexpected type– required: variable found: value. I tried == and that obviously didn't work. Any insight? 回答1: You switched the operands in your assign statement. Switch this Math.abs(a[i]-a[i-1]) = biggestGap;

问题 I'm trying to find all the primes less than some integer n as concisely as possible, using list comprehensions. I'm learning Haskell, and this is just an exercise. I'd like to write something like: isqrt :: Integral a => a -> a isqrt = floor . sqrt . fromIntegral primes :: Integral a => a -> [a] primes n = [i | i <- [1,3..n], mod i k /= 0 | k <- primes (isqrt i)] which of course doesn't work. Is there a way to have a list comprehension inside a list comprehension? Here is the error I'm

问题 I would like to use worksheet_change() to run macro1 if cell1 is changed, macro2 if cell2 is changed, etc. I understand that worksheet_change() only allows target and sh, and that only one sub can be used. I thought I could run something like: Private Sub Targets(ByVal Target As Range) Select Case Target.Address Case "cell1" Call SheetChange.macro1 Case "cell2" Call SheetChange.macro2 Case "cell3" Call SheetChange.macro3 End Select End Sub But, apparently I cannot! I also tried Private Sub

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I just realized the professor Google is unable to present a specific page where I can find out, when static keyword added to PHP 4. Though following the

问题 is it possible that a variable is referenced without using the $? For example: if ($a != 0 && a == true) { ... } I don't think so, but the code (not written by me) doesn't show an error and I think it's weird. I've overlooked the code and a is not a constant either. 回答1: In PHP, a constant can be defined, which would then not have a $ , but a variable must have one. However, this is NOT a variable, and is not a substitute for a variable. Constants are intended to be defined exactly once and

问题 I installed Eclipse SDK Indigo and then followed the following instructions to install PDT on it: This is the original solution posted by ben-k link to the topic: Eclipse indigo PDT 3.0 gotcha download "Eclipse Classic" unzip/install to a new folder location (e.g. c:\eclipse-indigo-win32\ go to help->install new software select Indigo - http://download.eclipse.org/releases/indigo from the "Work with" drop down list type "php" in the filter text Select "PHP Development Tools (PDT) SDK Feature

问题 I'm trying to make a buffer to hold 16, 16-bit wide instructions for a small CPU design. I need a way to load instructions into the buffer from my testbench. So I wanted to use an array of std_logic_vectors to accomplish this. However, I am getting a syntax error and I'm not sure why (or if I'm allowed to do this in VHDL for that matter). The syntax error is at the line where I declare instructions library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.NUMERIC_STD.ALL; entity instruction_buffer

问题 This question already has answers here : Incorrect Syntax: Create Procedure must be the only statement in the batch (2 answers) Closed 2 years ago . I'm creating this table but I'm running into a problem with the first procedure (sp_joseview) create table josecustomer( name varchar(50), address varchar(300), ssnid int, balance bigint, accountnumber bigint ) insert into josecustomer values('Aman','Canada',10000,5000,100000000) insert into josecustomer values('Shubham','USA',10001,6000