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LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...到30元，应否改变生产计划？
模型代码如下：
max=72*x1+64*x2;
x1+x2<=50;
12*x1+8*x2<=480;
3*x1<=100;
求解这个模型并做灵敏性分析，结果如下。
Global optimal solution found at iteration: 0
Objective value: 3360.0...
What's the advantage of a Java enum versus a class with public static final fields?
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casablancacasablanca
64.3k55 gold badges121121 silver badges142142 bronze badges
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javac is not recognized as an internal or external command, operable program or batch file [closed]
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CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
...
The most important variable is PATH. It is a list of paths, separated by ;. When a command is entered into cmd, each directory in the list will be scanned for a matching executable.
O...
Why does typeof NaN return 'number'?
...9: Number value
primitive value corresponding to a double-precision 64-bit binary format IEEE 754 value.
ECMA 262 5e Section 4.3.23: NaN
Number value that is a IEEE 754 "Not-a-Number" value.
IEEE 754 on Wikipedia
The IEEE Standard for Floating-Point Arithmetic is a ...
Python: Convert timedelta to int in a dataframe
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abeboparebopabeboparebop
4,73644 gold badges2727 silver badges3838 bronze badges
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How to switch to the new browser window, which opens after click on the button?
...Security → Untick Enable Enhanced Protected Mode
Code:
Browser: IE11 x64 (Zoom: 100%)
OS: Windows 7 x64
Selenium: 3.5.1
WebDriver: IEDriverServer x64 3.5.1
public static String openWindow(WebDriver driver, By by) throws IOException {
String parentHandle = driver.getWindowHandle(); // Save pare...
Scripting TFS Command Line for Get Latest Version, Check Out and Check in, programmatically
...is: %ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE, or on Windows x64: %ProgramFiles(x86)%\Microsoft Visual Studio 10.0\Common7\IDE (depending on Visual Studio version and installation settings).
Example for get:
cd C:\TFS\Arquitectura
"%PathToIde%\TF.exe" get $/Arquitectura/Main /recursiv...
What is the optimal length for an email address in a database?
...er", and the domain part is "example.com".
The local part must not exceed 64 characters and the domain part cannot be longer than 255 characters.
The combined length of the local + @ + domain parts of an email address must not exceed 254 characters. As described in RFC3696 Errata ID 1690.
I got t...
unable to copy/paste in mingw shell
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[Alternative] For MINGW64 (mintty 2.7.9) terminal in Windows 10, you can enable "Ctrl+Shift+letter shortcuts" to perform copy with (Ctrl+Shift+c) and paste with (Ctrl+Shift+v).
To enable the feature:
right-click command window
Click on 'Keys'
C...
Realistic usage of the C99 'restrict' keyword?
... *b
add R2 += R1
set R2 → *b
Does GCC really do it?
GCC 4.8 Linux x86-64:
gcc -g -std=c99 -O0 -c main.c
objdump -S main.o
With -O0, they are the same.
With -O3:
void f(int *a, int *b, int *x) {
*a += *x;
0: 8b 02 mov (%rdx),%eax
2: 01 07 add ...