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米思齐(Mixly) × App Inventor2 接入调研报告：技术路线、接入步骤与教程...
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• 接收：Clock 定时器 + BluetoothClient.BytesAvailable/ReceiveText 轮询显示
3. 协议约定：建议用简单文本协议如 T:25.5
，App 端按分隔符解析
BLE 路线差异：App 端用 BluetoothLE 扩展（Scan/Connect → 写 Characteristic 发指令、Reg...
2026 第 48 届世界技能大会 移动应用开发 手搓代码竞赛 - 闲聊区 - 清泛IT...
App 手搓代码比赛，还有网页设计，后端开发，AI 时代还用得上？即将用我们的 AI 助手搓出来比一比看看
What is the difference between float and double?
... + 3.9999999 = 0, the exact roots to 10 significant digits are, r1 = 2.000316228 and r2 = 1.999683772.
Using float and double, we can write a test program:
#include <stdio.h>
#include <math.h>
void dbl_solve(double a, double b, double c)
{
double d = b*b - 4.0*a*c;
dou...
What is the C++ function to raise a number to a power?
...yped so it matches one of those three perfectly. I usually use double
pow(2.0, N)
Some lawyer crap from me again. I've often fallen in this pitfall myself, so I'm going to warn you about it.
share
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Log to the base 2 in python
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float → float math.log2(x)
import math
log2 = math.log(x, 2.0)
log2 = math.log2(x) # python 3.4 or later
Thanks @akashchandrakar and @unutbu.
float → int math.frexp(x)
If all you need is the integer part of log base 2 of a floating point number, extracting the exponent i...
When to encode space to plus (+) or %20?
...www-form-urlencoded'. This is used for posting form data.
Now, the HTML 2.0 Specification (RFC1866) explicitly said, in section 8.2.2, that the Query part of a GET request's URL string should be encoded as 'application/x-www-form-urlencoded'. This, in theory, suggests that it's legal to use a '...
IOS: create a UIImage or UIImageView with rounded corners
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I have used this code in Swift 2.0, and it worked properly, thank you. By the way, I have changed YES by true.
– lmiguelvargasf
Aug 19 '15 at 17:31
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RegEx for matching UK Postcodes
... I can't get this to work in JavaScript. Does it only work with certain regex engines?
– NickG
Mar 27 '14 at 9:57
13
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How to generate the JPA entity Metamodel?
In the spirit of type safety associated with the CriteriaQuery JPA 2.0 also has an API to support Metamodel representation of entities.
...
Merging two arrays in .NET
Is there a built in function in .NET 2.0 that will take two arrays and merge them into one array?
21 Answers
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