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浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...减法，它会转化为1+(-1) ,因此
0000 0001
+ 1000 0001
____________________
1000 0010 …………… -2 ，1-1= -2? 这显然是不对了，所以为了避免减法运算错误，计算机大神们发明出了反码，直接用最高位表示符号位的叫做...
Objective-C : BOOL vs bool
...It also means that this example code will run differently on different platforms (tested it myself):
int myValue = 256;
BOOL myBool = myValue;
if (myBool) {
printf("i'm 64-bit iOS");
} else {
printf("i'm 32-bit iOS");
}
BTW never assign things like array.count to BOOL variable because abo...
Underscore vs Double underscore with variables and methods [duplicate]
...butes: interface, _internal, __private
But try to avoid the __private form. I never use it. Trust me. If you
use it, you WILL regret it later.
Explanation:
People coming from a C++/Java background are especially prone to
overusing/misusing this "feature". But __private names don't...
How do I move to end of line in Vim?
...
I use _ and g_ for visual/yanking, as $ will also copy/delete the new line (LN) character.
– Ernest
May 8 '14 at 13:08
...
What is the meaning of single and double underscore before an object name?
...n someone please explain the exact meaning of having leading underscores before an object's name in Python, and the difference between both?
...
Benchmarking (python vs. c++ using BLAS) and (numpy)
... extensive use of BLAS and LAPACK linear algebra functionalities. Since performance is an issue I did some benchmarking and would like know, if the approach I took is legitimate.
...
SQL Add foreign key to existing column
...sing the following SQL command in SQL Server 2008 to update a table with a foreign key constraint:
6 Answers
...
ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged)
...ou change a value inside the collection, instead you should be looking out for the CollectionChanged event firing.
public class CollectionViewModel : ViewModelBase
{
public ObservableCollection<EntityViewModel> ContentList
{
get { return _contentList; }
}
pu...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
... crash scenario is shown in GDB (checked with GDB version 7.1 on Ubuntu).
For example:
$ ./crash -p param1 -o param2
Segmentation fault (core dumped)
$ gdb ./crash core
GNU gdb (GDB) 7.1-ubuntu
...
Core was generated by `./crash -p param1 -o param2'. <<<<< See this line shows crash ...
Calendar Recurring/Repeating Events - Best Storage Method
...
Storing "Simple" Repeating Patterns
For my PHP/MySQL based calendar, I wanted to store repeating/recurring event information as efficiently as possibly. I didn't want to have a large number of rows, and I wanted to easily lookup all events that would take place...