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Is writing then reading different union members undefined according to the C standard? [duplicate]

This question already has an answer here:I read that this code it is undefined according to the c standard but I cant find why. It is compiles without errors in gcc 8.1.0 and clang-6.0 and prints 1.

10月04日发表评论

How to create a map of maps from a list of maps with Java 8 streaming api

I have a list of maps that looks something like this:and I want the output to look like this:...where the values of old and new are summed for each related entry.

10月04日发表评论

Get first Monday in Calendar month

I am trapped in a Calendar/TimeZone/DateComponents/Date hell and my mind is spinning.I am creating a diary app and I want it to work worldwide (with a iso8601 calendar).

10月04日发表评论

Java for loop declaring initialization outside

According to the documentation of Oracle for loop is formed as we know it:E.g.,Why can't we declare the initialization part outside the for loop like this?

10月04日发表评论

Why should I not update all my CPAN modules?

I thought it would be a good idea in general to update all software on my computer regularly. Since CPAN modules are not managed by my package manager I figured I should do cpan -u every once in a while. It was only after executing this that I read the...

10月04日发表评论

How to delete a published crate from crates.io?

I have accidentally published my private crate to crates.io. How do I delete it? I checked the documentation but it seems like there is no way to delete a published crate.

10月04日发表评论

How to make both up/down arrow in select input field in CSS?

I am working on a website (built on Wordpress, custom theme) in which I want to add up/down arrow in the select input field in CSS. The HTML code which I am using in order to create up/down arrow for the select input field is:

10月04日发表评论

Better way to write jquery add/remove class

I'm not an expert on JS and jQuery, but I would like to improve my knowledge. I made this code that works for me, but I'm sure it can be done better. can you help me and explain how to synthesize it? It's a piece of a slideshow when a...

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How to escape double quotes in haskell?

I know that to escape special characters in Haskell we can use /", so if I try to pass as parameter:to the function

10月04日发表评论

Undefined behavior of right-shift in C++

From cppreference.com:For unsigned a and for signed a with nonnegative values, the value of a >> b is the integer part of a/2b . For negative a, the value of a >> b is implementation-defined (in most implementations, this performs arithmetic right shift, so that the result remains negative).

10月04日发表评论