2. Operation of pointer variable
(1) Assignment operation
The assignment operation of a pointer variable has the following several forms:① pointer variable initialization assignment, as described earlier.
② assigns the address of a variable to a
1.nil
>defines the ID of a null instance.
Defines an instance that is empty, pointing to an empty pointer to an object in OC.
> Sample code:
NSString *somestring = nil;
Nsurl *someurl = nil;
ID someobject = nil;
if (Anotherobject = = nil)//do
topoic= Dynamic Storage Allocation
In the array chapter, it was introduced that the length of several groups was predefined and fixed throughout the program. Dynamic array types are not allowed in C language. For example: int n;scanf ("%d", &n);
This article mainly introduces the iOS in Nil, Nil, NULL, Nsnull detailed information, the need for friends can refer to the
OBJC inside a few empty value symbols will almost kill me, these basic things should be clear to the line, in order to
[Example 7.14] set up the list above, delete the node, insert the function of the node together, build a function to output all the nodes, and then call them with the main function.#define NULL 0#define TYPE struct STU#define LEN sizeof (struct
One of the easiest ways to do this is to reverse input and then use the "root right left" sequence to build two-prong trees.
*********************************/ /**//**********gamesduan*********/ /**//**********bitreeinlast*********/ #include
Design one, global name space
All the global variables and functions in the routing simulation system are implemented in a name space.
Name space: Netsource
Name Space variables:
#define NULL 0
Network Device Type Table
Enum Netelementtype{fiber=1,
1, the link is to determine whether there is a loop?
(1) Loop definition:
1-2-3-4-5-6-7
| |
----8
As in the case above, it means that there is a loop.
(2) solve the idea:
Description: Use the speed pointer, the slow pointer each time only
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