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Python: Making a beep noise
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The cross-platform way to do this is to print('\a'). This will send the ASCII Bell character to stdout, and will hopefully generate a beep (a for 'alert'). Note that many modern terminal emulators provide the option to ignore bell char...
What do single quotes do in C++ when used on multiple characters?
... = 'celp',
} ;
There's a lot of chatter about this not being "platform independent", but when you're using an api that's made for a specific platform, who cares about portability. Checking for equality on the same platform will never fail. These enum'd values are easier to read and th...
System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second
...is not included in the .NET Standard Library and is not available on other platforms, such as .NET Core or the Universal Windows Platform. On these platforms, as well as for portability across all .NET platforms, you should use the System.Threading.Timer class instead.
– NotAga...
Clear terminal in Python [duplicate]
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A simple and cross-platform solution would be to use either the cls command on Windows, or clear on Unix systems. Used with os.system, this makes a nice one-liner:
import os
os.system('cls' if os.name == 'nt' else 'clear')
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如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
...且默认的系统没有开启supplementing log，所以能查看的内容有限。
或许还有审计的方法可用，我没测试。每种方法都有各自的缺陷，看来很难有一种完备的查看SQL执行历史的方法。
Oracle 执行历史
How can I generate an MD5 hash?
... byte representation in. If you just use string.getBytes() it will use the platform default. (Not all platforms use the same defaults)
import java.security.*;
..
byte[] bytesOfMessage = yourString.getBytes("UTF-8");
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] thedigest = md.diges...
C++ Best way to get integer division and remainder
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You cannot trust g++ 4.6.3 here with 64 bit integers on a 32 bit intel platform. a/b is computed by a call to divdi3 and a%b is computed by a call to moddi3. I can even come up with an example that computes a/b and a-b*(a/b) with these calls. So I use c=a/b and a-b*c.
The div method gives a ca...
Facebook App: localhost no longer works as app domain
...asic tab
1.) In the center under the first box of options, click "+ Add Platform" and choose "Website" (or whatever is appropriate for your app.)
2.) In the box that comes up for the website you just added: Site URL: http://localhost:3000/
3.) In the box above that (Settings => Basic): A...
What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
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This doesn't necessarily mean that a long long is wider than a long. Many platforms / ABIs use the LP64 model - where long (and pointers) are 64 bits wide. Win64 uses the LLP64, where long is still 32 bits, and long long (and pointers) are 64 bits wide.
There's a good summary of 64-bit data models...
How to insert newline in string literal?
...e. In my others it isn't. You really need to know that you want to use the platform-specific one. For example, it isn't a good idea if you're using a network protocol which should define line terminators itself.
– Jon Skeet
Nov 3 '10 at 9:50
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