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Why does appending “” to a String save memory?

I used a variable with a lot of data in it, say String data . I wanted to use a small part of this string in the following way: ...
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How can I unit test Arduino code?

...rks-in-progress in branches other than master, so check those branches for extra tests, too. I chose to write my own lightweight test routines, but more robust unit-test frameworks like CppUnit are also available. share ...
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How to create an array from a CSV file using PHP and the fgetcsv function

... I have created a function which will convert a csv string to an array. The function knows how to escape special characters, and it works with or without enclosure chars. $dataArray = csvstring_to_array( file_get_contents('Address.csv')); I tried it with your csv sample and...
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How can I generate a self-signed certificate with SubjectAltName using OpenSSL? [closed]

... add the following to the existing [ v3_ca ] section. Search for the exact string [ v3_ca ]: subjectAltName = @alternate_names You might change keyUsage to the following under [ v3_ca ]: keyUsage = digitalSignature, keyEncipherment digitalSignature and keyEncipherment are standard fare fo...
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hash function for string

I'm working on hash table in C language and I'm testing hash function for string. 9 Answers ...
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JSONDecodeError: Expecting value: line 1 column 1 (char 0)

...or is due to : non-JSON conforming quoting XML/HTML output (that is, a string starting with <), or incompatible character encoding Ultimately the error tells you that at the very first position the string already doesn't conform to JSON. As such, if parsing fails despite having a data-bo...
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Returning an array using C

...nd of the sizeof or unary & operators, or if the array expression is a string literal being used to initialize another array in a declaration. Among other things, this means that you cannot pass an array expression to a function and have it received as an array type; the function actually rec...
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各编程语言读写文件汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术

...p); C#读写文件: using System.IO; private void ReadWriteFunc(string str) { // 写文件 using (StreamWriter sw = new StreamWriter(@"test.txt")) { sw.WriteLine("file content..."); sw.Flush(); sw.Close(); } // 读文件...
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HTTP POST and GET using cURL in Linux [duplicate]

...re useful to see the results in a clean JSON format instead of a very long string. Just add | grep }| python -mjson.tool to the end of curl commands here is two examples: GET approach with JSON result curl -i -H "Accept: application/json" http://someHostName/someEndpoint | grep }| python -mjson.t...
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What can be the reasons of connection refused errors?

...king for firewalls and that the port is open, use telnet to connect to the ip/port to test connectivity. This removes any potential issues from your application. share | improve this answer ...