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How do I declare a 2d array in C++ using new?
... using a loop, like this:
int** a = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
a[i] = new int[colCount];
The above, for colCount= 5 and rowCount = 4, would produce the following:
share
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When should Flask.g be used?
...ss to any request object (e.g. when running batch DB operations in a shell script). If you try and extend the application context to encompass more than one request context, you're asking for trouble. So, rather than my test above, you should instead write code like this with Flask's contexts:
from...
How do I check for C++11 support?
...et to the version of the C++ standard supported see this
#if __cplusplus <= 199711L
#error This library needs at least a C++11 compliant compiler
#endif
It is set to 199711L in Visual Studio 2010 SP1, but I do not know if vendors will be so bold to increase it already if they just have (part...
How to write a simple database engine [closed]
...of delimiter is never used in your data itself. i.e. if you have selected <*> for example to separate columns, you should validate the data you are placing in this table not to contain this pattern. you could also use a row header and a column header by specifying size of row and some internal...
C# vs C - Big performance difference
...a problem because you could distribute your source and create installation scripts that compile the code using the appropriate optimization. On the windows or closed source platform, you will have to distribute multiple executables, each with specific optimizations. The windows binaries that will be...
What are the differences between “=” and “
What are the differences between the assignment operators = and <- in R?
7 Answers
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Single vs Double quotes (' vs ")
...
The w3 org said:
By default, SGML requires that all attribute values be delimited using either double quotation marks (ASCII decimal 34) or single quotation marks (ASCII decimal 39). Single quote marks can be included within the attribute value when ...
Retrieving a random item from ArrayList [duplicate]
...lass Catalogue
{
private Random randomGenerator;
private ArrayList<Item> catalogue;
public Catalogue()
{
catalogue = new ArrayList<Item>();
randomGenerator = new Random();
}
public Item anyItem()
{
int index = randomGenerator.nextInt...
Usage of protocols as array types and function parameters in swift
... classes used with it conform to SomeProtocol, like this:
class SomeClass<T: SomeProtocol> {
typealias ElementType = T
var protocols = [ElementType]()
func addElement(element: ElementType) {
self.protocols.append(element)
}
func removeElement(element: ElementType...
How to find files that match a wildcard string in Java?
... slow compared to an ls with the same file pattern (milliseconds using ls <pattern> vs. minutes when using the DirectoryScanner)...
– dokaspar
Apr 24 '18 at 9:35
add a c...