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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...不需要回复的可留空~ 请描述您的问题（300字以内）： 给个鼓励也行呐~o~ 提供截图（仅截取当前可视区域...
When would anyone use a union? Is it a remnant from the C-only days?
...neral endianness interface to an unknown external host.
Manipulate foreign CPU architecture floating point data, such as accepting VAX G_FLOATS from a network link and converting them to IEEE 754 long reals for processing.
Provide straightforward bit twiddling access to a higher-level type.
union...
Sleep for milliseconds
...
cout << "urrrrggghhhh!" << endl;
}
Corrected code - now CPU stays in IDLE state [2014.05.24]:
#include <iostream>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif // _WIN32
using namespace std;
void sleepcp(int milliseconds);
void s...
Why does Decimal.Divide(int, int) work, but not (int / int)?
...ase-3: 0.1).
Floating-point numbers are faster to work with (in terms of CPU time; programming-wise they are equally simple) and preferred whenever you want to minimize rounding error (as in scientific applications).
shar...
AsyncTask threads never die
...xecution. How many will run at once is based on the number of cores of the CPU. AFAIK, the current algorithm is 2N+1 parallel threads, where N is the number of cores.
– CommonsWare
Feb 16 '18 at 11:40
...
Java “Virtual Machine” vs. Python “Interpreter” parlance?
...ndbox unto itself. The VM is analogous to an instruction set of a specific CPU and tends to work at a more fundamental level with very basic building blocks of such instructions (or byte codes) that are independent of the next. An instruction executes deterministically based only on the current stat...
“hello, world” 起源及其他 - 创意 - 清泛网 - 专注C/C++及内核技术
...章（我的hello world）、环境搭建成功后的第一个测试…
问题的提出
相传古时候有个退休的程序员，在家闲来无事，决定修习书法之道。第一日，备好笔墨纸砚，便挥毫写下一行大字：“hello, world”。
学过编程语言的人都笑了...
boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...以自定义比较函数。另外，如果调试过程中遇到很奇怪的问题，可以在自定义比较函数中下断点进行调试。
// boost_demo.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "boost/shared_ptr.hpp"
#include "boost/bimap.hpp"
#in...
CMap用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...Y要选LPCTSTR。
遇到好几个人说CMap在用CString做key类型时有问题，说用int和DWORD就可以，用CString就不行。因此很多人推荐使用MFC中的CMapStringToPtr之类。关键是ARG_KEY要选LPCTSTR，否则编译报错。
CMap<CString, LPCTSTR, int, int> typeMap;
typeM...
mfc 画圆角矩形 - C/C++ - 清泛网 - 专注C/C++及内核技术
...大家自行调整下。
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mfc 画图 圆角矩形