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How do pointer to pointers work in C?
How do pointers to pointers work in C?
When would you use them?
14 Answers
14
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Android Camera : data intent returns null
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The default Android camera application returns a non-null intent only when passing back a thumbnail in the returned Intent. If you pass EXTRA_OUTPUT with a URI to write to, it will return a null intent and the picture is in the URI that you passed in.
You can verify this by looking...
How many levels of pointers can we have?
How many pointers ( * ) are allowed in a single variable?
14 Answers
14
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What is the difference between a reference type and value type in c#?
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Your examples are a little odd because while int, bool and float are specific types, interfaces and delegates are kinds of type - just like struct and enum are kinds of value types.
I've written an explanation of reference types and value types in this article. I'd be ...
Best way to require all files from a directory in ruby?
...ure will not be loaded if its name already appears in $". The file name is converted to an absolute path, so "require 'a'; require './a'" will not load a.rb twice. ruby-doc.org/core/classes/Kernel.html#M001418
– Derek
Jan 29 '11 at 17:47
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Remove characters from C# string
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Am I the only one who gets "Argument 2: cannot convert from 'string' to 'char'" om string.Empty?
– OddDev
Oct 25 '16 at 16:25
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Randomize a List
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public static void Shuffle<T>(this IList<T> list)
{
int n = list.Count;
while (n > 1) {
n--;
int k = rng.Next(n + 1);
T value = list[k];
list[k] = list[n];
list[n] = value;
}
}
Usage:
List<Product> pro...
Difference between const & const volatile
...ised due to the const qualifier) - at least through that particular name/pointer.
The volatile part of the qualifier means that the compiler cannot optimize or reorder access to the object.
In an embedded system, this is typically used to access hardware registers that can be read and are updated ...
ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...码
//包含zmq的头文件
#include <zmq.h>
#include "stdio.h"
int main(int argc, char * argv[])
{
void * pCtx = NULL;
void * pSock = NULL;
const char * pAddr = "tcp://*:7766";
//创建context，zmq的socket 需要在context上进行创建
if((pCtx = zmq_ctx_ne...
What issues should be considered when overriding equals and hashCode in Java?
...y. An example:
public class Person {
private String name;
private int age;
// ...
@Override
public int hashCode() {
return new HashCodeBuilder(17, 31). // two randomly chosen prime numbers
// if deriving: appendSuper(super.hashCode()).
append(nam...