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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...他算符兼具等号的功能，我们称后面的算符为等号算符；C：英文CLEAR的缩写，用于清除计算过程中的全部信息；CE：英文CLEAR ENTRY的缩写，用于清除在算符之后输入的所有数字——后数；←（回退）：用于从尾部清除后数中的一...
Is the != check thread safe?
I know that compound operations such as i++ are not thread safe as they involve multiple operations.
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Designing function f(f(n)) == -n
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Do try/catch blocks hurt performance when exceptions are not thrown?
During a code review with a Microsoft employee we came across a large section of code inside a try{} block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only importa...
How does this print “hello world”?
I discovered this oddity:
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Defining static const integer members in class definition
My understanding is that C++ allows static const members to be defined inside a class so long as it's an integer type.
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How do I add a linker or compile flag in a CMake file?
I am using the arm-linux-androideabi-g++ compiler. When I try to compile a simple "Hello, World!" program it compiles fine. When I test it by adding a simple exception handling in that code it works too (after adding -fexceptions .. I guess it is disabled by default).
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Sell me on const correctness
So why exactly is it that it's always recommended to use const as often as possible? It seems to me that using const can be more of a pain than a help in C++. But then again, I'm coming at this from the python perspective: if you don't want something to be changed, don't change it. So with that ...
Generating a drop down list of timezones with PHP
...ists that I found and then one method using the built in PHP DateTime class in PHP 5.
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How to check Django version
I have to use Python and Django for our application. So I have two versions of Python, 2.6 and 2.7. Now I have installed Django. I could run the sample application for testing Django succesfuly. But how do I make sure whether Django uses the 2.6 or 2.7 version and what version of modules Django ...