Questions

In Windows cmd, how do I prompt for user input and use the result in another command?

I have a Windows .bat file which I would like to accept user input and then use the results of that input as part of the call to additional commands. For example, I'd like to accept a process ID from...

27 Jun at 12:49

How do I connect to a MySQL Database in Python?

How do I connect to a MySQL database using a python program?

28 Jul at 17:48

How to add elements to an empty array in PHP?

If I define an array in PHP such as (I don't define its size): ``` $cart = array(); ``` Do I simply add elements to it using the following? ``` $cart[] = 13; $cart[] = "foo"; $cart[] = obj; ``` ...

14 Apr at 08:20

How can I convert an int to a string in C?

How do you convert an `int` (integer) to a string? I'm trying to make a function that converts the data of a `struct` into a string to save it in a file.

6 Feb at 16:27

How to replace item in array?

Each item of this array is some number: ``` var items = Array(523,3452,334,31, ...5346); ``` How to replace some item with a new one? For example, we want to replace `3452` with `1010`, how would we ...

12 Jan at 19:42

How to mount a host directory in a Docker container

I am trying to mount a host directory into a Docker container so that any updates done on the host is reflected into the Docker containers. Where am I doing something wrong. Here is what I did: ``` ...

15 Mar at 11:42

How can I compare numbers in Bash?

I'm unable to get numeric comparisons working: ``` echo "enter two numbers"; read a b; echo "a=$a"; echo "b=$b"; if [ $a \> $b ]; then echo "a is greater than b"; else echo "b is greater tha...

25 Apr at 16:22

How do I make a textbox that only accepts numbers?

I have a windows forms app with a textbox control that I want to only accept integer values. In the past I've done this kind of validation by overloading the KeyPress event and just removing character...

20 Jan at 21:55

How to get the image size (height & width) using JavaScript

Is there a JavaScript or jQuery API or method to get the dimensions of an image on the page?

31 Jan at 23:41

How do I add an empty directory to a Git repository?

How do I add an empty directory (that contains no files) to a Git repository?

18 Jul at 18:41

Message "Support for password authentication was removed. Please use a personal access token instead."

I got this error on my console when I tried to use `git pull`: > remote: Support for password authentication was removed on August 13, 2021. Please use a personal access token instead. remote: Please ...

Remove all child elements of a DOM node in JavaScript

How would I go about removing all of the child elements of a DOM node in JavaScript? Say I have the following (ugly) HTML: ``` <p id="foo"> <span>hello</span> <div>world</div> </p> ``` And I ...

7 Feb at 17:47

How to convert UTF-8 byte[] to string

I have a `byte[]` array that is loaded from a file that I happen to known contains [UTF-8](http://en.wikipedia.org/wiki/UTF-8). In some debugging code, I need to convert it to a string. Is there a one...

6 Aug at 16:10

Get difference between two lists with Unique Entries

I have two lists in Python: ``` temp1 = ['One', 'Two', 'Three', 'Four'] temp2 = ['One', 'Two'] ``` Assuming the elements in each list are unique, I want to create a third list with items from the fir...

Changing image size in Markdown

I just got started with Markdown. I love it, but there is one thing bugging me: How can I change the size of an image using Markdown? The documentation only gives the following suggestion for an imag...

14 May at 10:29

MySQL - UPDATE query based on SELECT Query

I need to check (from the same table) if there is an association between two events based on date-time. One set of data will contain the ending date-time of certain events and the other set of data w...

6 Jun at 02:30

How do I send a POST request with PHP?

Actually I want to read the contents that come after the search query, when it is done. The problem is that the URL only accepts `POST` methods, and it does not take any action with `GET` method... I...

22 Sep at 17:53

What is the JavaScript string newline character?

Is `\n` the universal newline character sequence in JavaScript for all platforms? If not, how do I determine the character for the current environment? I'm not asking about the HTML newline element (`...

5 Nov at 15:7

How do I create an empty array and then append to it in NumPy?

I want to create an empty array and append items to it, one at a time. ``` xs = [] for item in data: xs.append(item) ``` Can I use this list-style notation with [NumPy](http://en.wikipedia.org/w...

20 Jun at 01:58

How can I get last characters of a string

I have ``` var id="ctl03_Tabs1"; ``` Using JavaScript, how might I get the last five characters or last character?

1 Apr at 11:12

How do you get the index of the current iteration of a foreach loop?

Is there some rare language construct I haven't encountered (like the few I've learned recently, some on Stack Overflow) in C# to get a value representing the current iteration of a foreach loop? For...

23 Mar at 08:51

How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

I am working on an app using `Vue js`. According to my setting I need to pass to a variable to my URL when setting change. ``` <!-- language: lang-js --> $.get('http://172.16.1.157:8002/firstco...

26 Oct at 23:23

How to get the browser to navigate to URL in JavaScript

What is the best (correct, modern, cross-browser, safe) way to get a web browser to navigate to a URL of your choice using JavaScript?

6 Feb at 14:54

Correct format specifier for double in printf

What is the correct format specifier for `double` in printf? Is it `%f` or is it `%lf`? I believe it's `%f`, but I am not sure. ### Code sample ``` #include <stdio.h> int main() { double d = 1....

How do I check if a file exists in Java?

> How can I check whether a file exists, before opening it for reading in (the equivalent of `-e $filename`)? The only [similar question on SO](https://stackoverflow.com/questions/1237235/check-f...

17 Apr at 18:8