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C++ convert hex string to signed integer
...gt;> x;
// output it as a signed type
std::cout << static_cast<int>(x) << std::endl;
}
In the new C++11 standard, there are a few new utility functions which you can make use of! specifically, there is a family of "string to number" functions (http://en.cppreference.co...
std::string to float or double
...string to a double.
You can do it with the stringstream or boost::lexical_cast but those come with a performance penalty.
Ahaha you have a Qt project ...
QString winOpacity("0.6");
double temp = winOpacity.toDouble();
Extra note:
If the input data is a const char*, QByteArray::toDouble will b...
Export database schema into SQL file
..._NAME
,''[''+inf.COLUMN_NAME+'']'' as COLUMN_NAME
,CAST(inf.ORDINAL_POSITION AS INT)
,inf.COLUMN_DEFAULT
,dobj.name AS ColumnDefaultName
,CASE WHEN inf.IS_NULLABLE = ''YES'' THEN 1 ELSE 0 END
,inf.DATA_TYPE
,case inf...
Type Checking: typeof, GetType, or is?
...type at execution time. There are rarely any cases to use is as it does a cast and, in most cases, you end up casting the variable anyway.
There is a fourth option that you haven't considered (especially if you are going to cast an object to the type you find as well); that is to use as.
Foo foo ...
Specifically, what's dangerous about casting the result of malloc?
... the first one), you can get an unpredictable runtime error when using the cast without including stdlib.h.
So the error on your side is not the cast, but forgetting to include stdlib.h. Compilers may assume that malloc is a function returning int, therefore converting the void* pointer actually re...
How should I cast in VB.NET?
...t is. Use this if var is not a string already.
CStr(var) is the VB string cast operator. I'm not a VB guy, so I would suggest avoiding it, but it's not really going to hurt anything. I think it is basically the same as CType.
CType(var, String) will convert the given type into a string, using any...
explicit casting from super class to subclass
...does not generate a compilation error, but at runtime it generates a ClassCastException . Why can't the compiler detect this error?
...
How to cast an Object to an int
How can I cast an Object to an int in java?
19 Answers
19
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Type safety: Unchecked cast
...ext().getBean("someMap");
Secondly, the compiler is complaining that you cast the object to a HashMap without checking if it is a HashMap. But, even if you were to do:
if(getApplicationContext().getBean("someMap") instanceof HashMap) {
private Map<String, String> someMap = (HashMap<S...
How do I fix "The expression of type List needs unchecked conversion…'?
...
The warning-free approach is to create a new List<SyndEntry>, then cast each element of the sf.getEntries() result to SyndEntry before adding it to your new list. Collections.checkedList does not do this checking for you—although it would have been possible to implement it to do so.
By d...