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Calculate number of days between two dates in r

I need to calculate the number of days elapsed between multiple dates in two ways and then output those results to new ... 29, 54, 54, 730)) See Question&Answers more detail:os...

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java - Where to put external jars in jdk10

I've been putting external jars in jre/lib/ext in JDK8 However ,when i update my jdk to jdk10,i cannot ... should I put those external jars? See Question&Answers more detail:os...

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c++ - variable nested for loops

I'm trying to figure out how I can use recursion to do n-level nested for loops. For example, if n=3, there would be 3 ... 1 3 2 4 3 . . . 12 1 See Question&Answers more detail:os...

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c++ - Unable to read frames from VideoCapture from secondary webcam with OpenCV

Code: Simple example that works perfectly with primary webcam (device 0): VideoCapture cap(0); if (!cap. ... Any help will be appreciated. See Question&Answers more detail:os...

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javascript - Return value from a Promise constructor

Consider two examples below... TEST 1 function test1() { return new Promise(function () { return 123; }); } ... object as per the promise spec. See Question&Answers more detail:os...

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java - Meaning of "Cannot reduce the visibility of the inherited method" with an interface

I have two files: public interface PrintService { void print(PrintDetails details); class PrintDetails { private String ... this means for me? See Question&Answers more detail:os...

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javascript - createImageBitmap alternative on Safari

I'd like to generate images in a bit of asm.js code running on a web worker. And I'd like to ... is irrelevant for the question at hand. See Question&Answers more detail:os...

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Printing a Unicode Symbol in C

I'm trying to print a unicode star character (0x2605) in a linux terminal using C. I've followed the ... this work with the ncurses library. See Question&Answers more detail:os...

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angular - Cannot Instantiate DatePipe

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php - Is htmlspecialchars enough to prevent an SQL injection on a variable enclosed in single quotes?

Although many sources quote the htmlspecialchars function with ENT_QUOTES to be not enough to prevent SQL ... around mysql_real_escape_string()? See Question&Answers more detail:os...

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java - Two ArrayList one RecyclerView Adapter

I have a chat screen where i can chat with other user, i am sending chat data (message,time and ... or adapter.notifyDataSetChanged should work? See Question&Answers more detail:os...

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node.js - Mongoose - caused by :: 11000 E11000 duplicate key error index?

Why do I get this duplicate error - Error creating new user: WriteError({"code":11000,"index":0,"errmsg":" ... "__v":0}}) any ideas? See Question&Answers more detail:os...

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c# - IIS 7.5, Web Service and HTTP 405 error

I have a web service which I host on my machine. I use Windows 7 and IIS 7.5. Problem: When the client ... ? Web service is built using WCF. See Question&Answers more detail:os...

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c# - DateTime column type becomes String type after deserializing DataTable

I have a DataTable having two columns. ShipmentDate(DateTime) and Count(Int). after I deserialize the string I ... create strongly typed class. See Question&Answers more detail:os...

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linux - SUID not working with shell script

I have created a small shell script with the following content: cat /usr/bin/checksuid.sh !/bin/bash echo " ... that why SUID is not working? See Question&Answers more detail:os...

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c++ - How is its lifetime of a return value extended to the scope of the calling function when it is bound to a const reference in the calling function?

"If you return a value (not a reference) from the function, then bind it to a const reference in the ... Am I missing something trivial here? See Question&Answers more detail:os...

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c++ - when do we need to pass the size of array as a parameter

I am a little bit confused about pass an array in C/C++. I saw some cases in which the signature is like this ... and when and how to use it? See Question&Answers more detail:os...

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html - transition for background-image in firefox?

I am trying to find an alternative for this: "transition:background-image 1s whatever" in firefox since it only ... using opacity. Thank you. See Question&Answers more detail:os...

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python - calculate the difference between two datetime.date() dates in years and months

I want to calculate the difference between two datetime.date() dates in years and months. For example; d1 = date( ... years & 4 months. Thanks. See Question&Answers more detail:os...

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in app billing - Android - protecting in app purchases with server side verification

I'm new to android development but created an app and I implemented in-app purchase to remove ads from the app ... me to a tutorial. Thanks See Question&Answers more detail:os...

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compilation - Is there a compiler preprocessor in Dart?

Since a compilation is required before launching a dart application, i wonder if compiler preprocessor is available, or is ... if you have one). See Question&Answers more detail:os...

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Trigger a Browser's Save-As Dialog via Javascript using only On-page data

As part of my page's output, I'm including a CSV formatted version of a data table in a text area, so ... the copied CSV. Is this possible? See Question&Answers more detail:os...

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sql server 2005 - SQL Sorting and hyphens

Is there a way to easily sort in SQL Server 2005 while ignoring hyphens in a string field? Currently I have ... to ignore the hypen in strings. See Question&Answers more detail:os...

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android how to finish an activity from other activity

In my app i have 3 activities. From 1st activity it goes to 2nd and from 2nd it goes to 3rd. From 3rd it is ... 2nd activity. How can I do that? See Question&Answers more detail:os...

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c - How to check Ethernet in Linux?

I need the test case for Ethernet in Linux using C code to check eth0. If eth0 is down, we enable the net then ... if up and the test is passed. See Question&Answers more detail:os...

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How to create sticky header bar for a website

I want to create a sticky header bar for a website just like the sticky header on this website (http://www. ... be of great help to me. See Question&Answers more detail:os...

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c++ - How do you set the cout locale to insert commas as thousands separators?

Given the following code: cout << 1000; I would like the following output: 1,000 This can be done using std::locale, ... '))); cout << 1000; } See Question&Answers more detail:os...

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dependency injection - How to use a DI / IoC container with the model binder in ASP.NET MVC 2+?

Let's say I have an User entity and I would want to set it's CreationTime property in the constructor to ... this simple/elegant/etc? :D See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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