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App Inventor 2 经典蓝牙(SPP) 硬件接入：hc05 · App Inventor 2 中文网
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HC05 简单介绍
基本接入代码参考
乱码问题排查思路
参与讨论
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经典蓝牙硬件有很多款，但是hc05尤为常见，这里以hc05为例，介绍一下经典蓝牙模块如何接入AppInventor。
HC05 简...
Using Java with Nvidia GPUs (CUDA)
...of the matrix. In this case, one can expect that the GPU will outperform a CPU at a certain matrix size. Another example could be when many complex trigonometric computations (sine/cosine etc) are performed on "few" data elements.
As a rule of thumb: You can assume that reading/writing one data el...
Why is address zero used for the null pointer?
...
@GMan - You are correct. On early CPUs, memory address zero was special and had hardware protection against access from running software (in some cases it was the start of the reset vector, and modifying it could prevent the CPU from resetting or starting up)...
Why does my application spend 24% of its life doing a null check?
...uting instructions, it is accessing memory. The execution core of a modern CPU is many times faster than the memory bus. A problem related to distance, the further an electrical signal has to travel, the harder it gets to get that signal delivered to the other end of the wire without it being corrup...
Stack Memory vs Heap Memory [duplicate]
...m C++.
Generally speaking, the stack is preferred as it is usually in the CPU cache, so operations involving objects stored on it tend to be faster. However the stack is a limited resource, and shouldn't be used for anything large. Running out of stack memory is called a Stack buffer overflow. It's...
Virtual functions and performance - C++
...curious, so I went ahead and ran some timings on the 3GHz in-order PowerPC CPU we work with. The test I ran was to make a simple 4d vector class with get/set functions
class TestVec
{
float x,y,z,w;
public:
float GetX() { return x; }
float SetX(float to) { return x=to; } // and so on...
Debug Error \"pure virtual function call\" 原因解析 - 更多技术 - 清泛...
...函数中抛出异常，不然，我们不得不面对以下两个严重的问题：
二次异常导致程序退出;
遗留下来的未完全销毁的对象与未完成的工作导致的后续问题
pure virtual function call就是这种情况。
但是理想与现实总是有差距的，...
How can I check if a Perl array contains a particular value?
...grep, hash...
any: 0 wallclock secs ( 0.67 usr + 0.00 sys = 0.67 CPU) @ 149253.73/s (n=100000)
first: 1 wallclock secs ( 0.63 usr + 0.01 sys = 0.64 CPU) @ 156250.00/s (n=100000)
grep: 42 wallclock secs (41.95 usr + 0.08 sys = 42.03 CPU) @ 2379.25/s (n=100000)
hash: 0 ...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
....
@echo off
setlocal
del /q /f %temp%\timestampfile_*
Logman.exe stop ts-CPU 1>nul 2>&1
Logman.exe delete ts-CPU 1>nul 2>&1
Logman.exe create counter ts-CPU -sc 2 -v mmddhhmm -max 250 -c "\Processor(_Total)\%% Processor Time" -o %temp%\timestampfile_ >nul
Logman.exe start ...
LinkedIn联合创始人：初创企业早期别花钱买用户 - 资讯 - 清泛网 - 专注C/C...
...程是如何运作的”的数据以及信息，虽然他们设计的招聘问题很有趣，但事实上经过专业训练的HR都不会提出(Google报告里)这些问题，这些问题的设计者，要是很熟悉HR问的问题但又不拘泥于传统观念的人，他也必须是要理解招聘...