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Calculating days between two dates with Java
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Simplest way:
public static long getDifferenceDays(Date d1, Date d2) {
long diff = d2.getTime() - d1.getTime();
return TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
}
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What does “dereferencing” a pointer mean?
...effectively a random, invalid pointer within these other memory regions).
3GL programming languages like C and C++ tend to hide this complexity, such that:
If the compiler gives you a pointer to a variable or function, you can dereference it freely (as long as the variable's not destructed/deallo...
How do I calculate percentiles with python/numpy?
... f == c:
return key(N[int(k)])
d0 = key(N[int(f)]) * (c-k)
d1 = key(N[int(c)]) * (k-f)
return d0+d1
# median is 50th percentile.
median = functools.partial(percentile, percent=0.5)
## end of http://code.activestate.com/recipes/511478/ }}}
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Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...6EC2A46 48 8B F9 mov rdi,rcx
0000000076EC2A49 48 8B D1 mov rdx,rcx
0000000076EC2A4C 48 8D 4C 24 40 lea rcx,[rsp+40h]
0000000076EC2A51 49 8B F1 mov rsi,r9
0000000076EC2A54 41 8B E8 mov ebp,r8d
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What's the difference between dynamic (C# 4) and var?
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I am going to explain difference between dynamic and var.
dynamic d1;
d1 = 1;
d1 = "http://mycodelogic.com";
This will work. compiler can re-create the type of dynamic variable.
first it create type as integer and after that compiler will recreate type as string but in case of var
var v...
Insert string at specified position
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$newstr = substr_replace($oldstr, $str_to_insert, $pos, 0);
http://php.net/substr_replace
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How to call a parent class function from derived class function?
...ere"<<endl;
Parent::fun1(++i);
}
};
int main()
{
Child d1;
d1.fun(1);
d1.fun1(2);
return 0;
}
Output:
$ g++ base_function_call_from_derived.cpp
$ ./a.out
Child::fun partial functionality write here
Parent::fun functionality write here
Parent::fun3 functionality write...
How do I find the time difference between two datetime objects in python?
...lta object with the difference.
>>> import datetime
>>> d1 = datetime.datetime.now()
>>> d2 = datetime.datetime.now() # after a 5-second or so pause
>>> d2 - d1
datetime.timedelta(0, 5, 203000)
You can convert dd.days, dd.seconds and dd.microseconds to minutes....
Compare two objects' properties to find differences?
...tic IEnumerable<T> DictionaryDiff<K, T>(Dictionary<K, T> d1, Dictionary<K, T> d2)
{
return from x in d1 where !d2.ContainsKey(x.Key) select x.Value;
}
Then you can do something like this:
static public IEnumerable<PropertyInfo> PropertyDiff(Type t1, Type t2)
{
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Can virtual functions have default parameters?
...er " << n;
return ss.str();
}
int main()
{
Base b1;
Der d1;
Base *pb1 = &b1, *pb2 = &d1;
Der *pd1 = &d1;
cout << pb1->Speak() << "\n" // Base 42
<< pb2->Speak() << "\n" // Der 42
<< pd1->Speak()...