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问题 I am trying to log in in stackoverflow and navigating on the search bar, searching by tidyverse package. The main problem is when I set the url, which is not giving me the form to fill with my email and my password: So url<-"https://stackoverflow.com" doesnt work. I tried the url: url<-"https://stackoverflow.com/users/login?ssrc=head&returnurl=https%3a%2f%2fstackoverflow.com%2f" which is the url that I have when I click on the the Log in bottom, but I also can't find the form to fill with my

问题 I was told that using a temp object was not the most effective way to swap elements in an array. Such as: Object[] objects = new Object[10]; // -- Assign the 10 objects some values var Temp = objects[2]; objects[2] = objects[4]; objects[4] = Temp; Is it really possible to swap the elements of the array without using another object? I know that with math units you can but I cannot figure out how this would be done with any other object type. 回答1: Swapping objects with a temporary is the most

问题 I want to build my own scanf function. Basic idea is data from a memory address and save it to another memory address. What is stdin? Is it a memory-address like 000ffaa? If it is a memory-address what is it so I can build my own scanf function. Thanks!. 回答1: No, stdin is not "a memory address". It's an I/O stream, basically an operating-system level abstraction that allows data to be read (or written, in the case of stdout ). You need to use the proper stream-oriented I/O functions to read

问题 This question already has answers here : Endless while loop problem with try/catch (2 answers) Closed 5 years ago . I need to be able to take user input until the input is greater than the initial price, but I also need to make it robust so that the user can't break the program by entering something other than a double/integer. If the user does enter something other than a double/int. The problem is that it creates a loop and repeats "Please enter valid currency" + "Please enter: price"

问题 I'm working on a C application that interacts with a mssql database running on Windows 2008 R2. I'm able to connect to the database and run specific queries, but when i use SQLBindParameter things fall apart. I found a post on stackoverflow that appears to be the same problem, but the solution doesnt appear to be the same (Problems getting SQLBindParameter to work in C++). According to C Data types SQL_C_CHAR is correct (https://msdn.microsoft.com/en-us/library/windows/desktop/ms714556(v=vs

问题 I have read this post. But when I tried: printf("before null %c after null\n", 0); // (ASCII=0) != '\0' ?? instead of getting: before null I got: before null after null So my question is: Is ASCII value 0 actually equal to '\0'? 回答1: Is ASCII value 0 actually equal to \0 ? Yes The differences in how the strings are stored in memory and handled by functions like printf() are important. "before null %c after null\n" "before null \0 after null\n" Both are stored in memory with an implicit \0

问题 I'm working on a C application that interacts with a mssql database running on Windows 2008 R2. I'm able to connect to the database and run specific queries, but when i use SQLBindParameter things fall apart. I found a post on stackoverflow that appears to be the same problem, but the solution doesnt appear to be the same (Problems getting SQLBindParameter to work in C++). According to C Data types SQL_C_CHAR is correct (https://msdn.microsoft.com/en-us/library/windows/desktop/ms714556(v=vs

问题 Let's say I have connection string for Development environment specified in appsettings.Development.json and connection string for the Staging environment specified in appsettings.Staging.json All I need to do to switch between Development and Staging is to navigate to Visual Studio Debug tab in project properties and change the value for ASPNETCORE_ENVIRONMENT environment variable. Now, of course I don't want to have connection string in appsettings.*.json for security reasons. So I move it

问题 I'm trying to create a generic function which calls another function with an any type parameter. This is what I tried: static GetInstance<T>(): T { return <T>injector.get(T); // get(param: any): any } The problem is this doesn't compile. I'm getting Cannot find name 'T' error. I tried get(typeof T) but typeof T is string "function" . What can I do? For clarification: get() method accept types. For example you can use it like this: import { MyService } from '..' constructor(){ let val = this

问题 I am using PphpStorm 2016.1. The php engine is php 7.0.4 and xdebug version is 2.4.0. I am using ubuntu 16.04 as well. The problem is that I can debug every request. But when I want to debug post request, $_POST global variable is getting empty variable. With debug mode posting a form is working but when enabling debug with PhpStorm I can't see $_POST variable's data. I did everything but but I did not find the solution. 回答1: docs: If you want to debug a script started through a web browser,