Problems with unsigned types and signed types in C++

Question 1: "When we assign a value to an unsigned type that exceeds its representation range, the result is the remainder of the initial value modulo the total number of values ​​represented by the unsigned type." How do you understand this sentence? For example, why is the result of assi...

给我你的怀抱 2017-06-19 09:07:29 0  1  1509

In PHP, what is the difference between single and double quoted strings?

I'm a little confused why in PHP some strings in the code use single quotes and some use double quotes. I just know that in .NET or C, if you use single quotes, that means it's a character, not a string.

P粉604507867 2023-08-18 11:45:01 0  2  679

What is the difference between single and double quoted strings in PHP?

I'm a little confused why I see some code in PHP where strings are put in single quotes and sometimes in double quotes. I just know that in .NET, or C, if it's in single quotes, that means it's a character, not a string.

P粉773659687 2023-08-23 20:46:33 0  2  814

What does the symbol "ampersand (&)" in TypeScript type definitions mean?

In line 60359 of this type definition file, there is the following statement: typeActivatedEventHandler=(ev:Windows.ApplicationModel.Activation.IActivatedEventArgs&WinRTEvent<any>)=>void;In this context, what does the & symbol mean?

P粉668804228 2023-08-22 17:25:53 0  2  426

php replaces all symbols or spaces in the string with "-"

How can I replace all symbols or spaces in a string of words with "-", including? @%! $&* (whatever)

PHPz 2017-05-16 13:16:12 0  3  583

python - Convert part of string type in multidimensional list to integer type

shell.txta1 b1 0.2 0a1 c1 0.8 0b1 c1 0.7 0a2 b2 1 0a2 d2 0.4 0d2 b2 0.6 0a1 a2 1 1a2 a1 0.1 1b1 b2 0.5 1b2 b1 0 1 {code...} Since the txt data is loaded in string type, Now we need to convert the last two columns into integers, please give me some clean...

PHPz 2017-05-18 11:02:13 0  1  1010

node.js - When node operates mysql, why do some query strings use backticks `` and some use double quotes ""

When using node to operate mysql, why do some query strings use backticks `` and some use double quotes ""? What is the significance of this? I hope the doubts can be answered {code...}

曾经蜡笔没有小新 2017-05-31 10:39:18 0  2  655

When selecting different options, the input field type can support 20 digit rupee with rupee symbol or replaced with percentage

If the option is selected to select fixed value then the input field type is Rupee value supports only 20 digits with Rupee symbol. If percentage is selected then the rupee symbol is replaced with percentage symbol and the value type is only 2 digits to enter the value without clicking the button My...

P粉022140576 2023-08-13 18:35:32 0  1  446

Way to remove double quotes and convert data type to string in Google BigQuery

The values ​​are of JSON object type and I want to change them to strings and remove the double quote symbols. I tried the replace and trim functions but they require strings as input. I also tried the replace, trim and cast functions but they require the input to be in string format. Select replace...

P粉481035232 2023-08-15 11:25:31 0  1  494

How to remove all strings after question mark in MySQL query

I have a column of urls like http://mydomain/app?u=asdfa&b=fnsn with different number of parameters. I want to remove all strings after the question mark and get different urls.

P粉921165181 2024-03-29 21:23:16 0  1  368

Visual Studio Code: Effective technique for clear dollar sign separation in variable names

I just switched from Atom to VisualStudioCode and I'm looking for a way to visually separate the dollar signs from variable names. Something like this is possible in Atom by editing a personal CSS stylesheet. After applying some CSS rules, this can be achieved: there is no space character between th...

P粉543344381 2024-03-21 20:31:19 0  1  534

javascript - When do double quotes in vue represent strings and when do they represent variables? It's a bit confusing

In Vue, when do double quotes represent strings and when do they represent variables? It’s a bit confusing.

漂亮男人 2017-05-19 10:40:01 0  1  802

javascript - The url parameter value has the special symbol "+", how to escape it?

The encodeURI() method is currently used in the project, so the encodeURI() function will not escape the following ASCII punctuation marks that have special meanings in URIs. When the passed parameter value is "Qu+", the server gets "Qu" and what it needs to get is 'Qu+'. How to ...

typecho 2017-07-05 10:44:04 0  4  929

How to assign a string with angle brackets to a cell in Tabulator.js, for example: "a<b<c"?

I have a cell in a Tabulator table that uses a list type editor. The options are populated by an array of strings, looking like this (for example): ["a

P粉718730956 2023-08-03 13:48:37 0  1  590

React with typescript defining useState type as an object with string key/value pairs

In Reactwithtypescript, I'm trying to define the useState type as an object with string key/value pairs. I couldn't find the answer so I thought I'd add it. I've tried this <{[key:string]:string}>> and some similar variations, but haven't successfully cracked it yet.

P粉014293738 2024-02-03 17:48:59 0  1  430

java - CSV data format contains delimiters within quotation marks. How to write regular expression

Recently, a JAVA project encountered a CSV data separation problem, which includes character types, numeric types and null values. The character type has double quotes, the numeric type does not have double quotes, and some character fields also contain the delimiter "," . "800802&quo...

曾经蜡笔没有小新 2017-05-27 17:41:25 0  1  977

How to delete a line from a file with php?

I have a file called $dir and a string called $line, I know this string is the complete line of the file but I don't know its line number, I want to remove it from the file, what should I do what to do? Can I use awk?

P粉489081732 2023-08-27 19:38:53 0  2  530

javascript - Huawei mate8, mate9 mobile phones and WeChat built-in browser cannot upload files.

It's OK to use other browsers, it's OK to test other mobile phones, and it's also been tested on other Huawei models. For the time being, only the Mate series has this problem. The test found that the file name (file.name) obtained by js has garbled symbols like %3A. If you have a Huawei phone mate8...

天蓬老师 2017-05-16 13:23:15 0  1  934