c pointers tutorial

reduced to 0, the base object is deleted ). A smart pointer is a class that simulates pointer actions. All Smart pointers are reloaded-> and * operators. Smart pointers also have many other functions, which are useful for automatic destruction. This mainly uses the limited scope of the stack object and the temporary object (limited scope implementation) destructor to release the memory. Of course, smart

Knowledge Points:• Pointers and variables (pointers to variables)• Pointers and functions (address passing)• Pointers and arrays (pointers to arrays)• Pointers and strings=================================

PointerI believe you are not unfamiliar with the following code:int i=2;int *p;p=i;This is the simplest pointer application and is the most basic usage. Let's get acquainted. What is a pointer: First the pointer is a variable, it holds not the usual data, but the address of the variable. As in the code above, the address information of the integer variable i is saved in pointer p.Next look at how to define a pointer, since the pointer is also a variable, then its definition as well as other vari

PointerI believe you are not unfamiliar with the following code:inti=2; int*p; p=i; This is the simplest pointer application and is the most basic usage. Let's get acquainted. What is a pointer: First the pointer is a variable, it holds not the usual data, but the address of the variable. As in the code above, the address information of the integer variable i is saved in pointer p.Next look at how to define a pointer, since the pointer is also a variable, then its definition as well as other

Document directory This should not discuss data and pointers. It should be reading notes! However, this question is better. Chapter 4 of Expert C Programming: shocking fact: arrays and pointers are different. I also learned a lot about myself. I learned a lot about the basic things, which is very helpful to those who are new to C developers. Let's talk about it. We always think that data and

The pointer is a more headache-prone problem in C/A + + learning, and in the process of programming, pointers are often the cause of hidden bugs. Here to talk about the application of pointers and need to pay attention to some of the problems, which may have you usually did not notice the problem, hoping to help readers understand the good pointers. 　　First, we

5.1 Pointers and addressesThe pointer is a variable that holds the address of the variable ANSI C uses the type void* (pointer to void) instead of char * as a generic pointer to the type unary operator can be used to fetch an object's address: p = c assigns the address of C to the variable p, We call p a pointer to C. The address operator can only be applied to objects in memory, that is, variables and array elements. Cannot act on an expression con

A pointer is a special variable. The value stored in it is interpreted as an address in the memory. To understand a pointer, we need to understand four aspects of the pointer: the pointer type, the pointer type, the pointer value, or the memory zone pointed by the pointer, there is also the memory zone occupied by the pointer itself. Let's explain it separately.First, declare several pointers for example: Example 1: (1) int * PTR;(2) char * PTR;(3) i

The difference between a reference and a pointer in C + +The difference between pointers to different types is that the pointer type knows what the compiler interprets in memory content and size in a particular address (the address the pointer points to), whereas the void* pointer represents only one memory address, and the compiler cannot pass the pointer to the object's type and size, so you want to pass void* The pointer manipulation object must be

There are always people who think that arrays are pointers, pointers are arrays, and both seem to be exactly the same thing. I have been naïve to think so before. In fact, thingsThis is not the case, pointers are pointers, arrays are arrays, and the two are completely different things. The reason we think of an array i

Some knowledge of C pointers and arrays is written in the front, but there are some important knowledge not explained, here is a supplement.First look at the way the normal variable (the pointer is also a variable) and the array name to view the address is different.To view the address of an array variable, you do not need to use . in the c,c++ language, the operation of an array variable is the equivalent of a direct action on the address of the vari

1. Array of pointers It is an array, the elements of the array are pointers, and how many bytes of the array are determined by the array itself, The abbreviation is: An array of stored pointers. "Example" int *p1[10]; Analysis: "[]" priority is higher than "*", P1 first with "[]" to form an array of names, the array named P1;int * is decorated with the contents o

program errors. This type of program error makes it difficult to find the cause of the problem, usually resulting in a segment error (on the Linux system) and general protection errors (in the Windows system). The system's stability may be affected if the operating system's memory allocator allocates the data areas that have already been overwritten. Some programming languages allow an uninitialized pointer to exist, and such pointers are wild

values to P1 3 The pointer variable can have a null value, that is, the pointer variable does not point to any variable, you can say this: P=null; Actually null represents an integer 0, which means that P points to a cell with address 0. This allows the pointer to not point to any valid cells. In fact, the system has defined NULL first: #define NULL 0 The above null definition is included in the iostream header file, and null is a symbolic constant. It should b

1. Pointers to arraysint balance[ }; int *//ptr is a pointer to the array balance // or it is also possible: ptr = balance[]; The difference between balance and PTR is that PTR is a variable and balance is a constant: // This is not possible, the IDE will error that the expression must be a modifiable lvalue 2. Pointer as function return valueAccording to rookie tutorial: http://www.runoob.com/cpluspl

Transferred from: http://blog.csdn.net/xt_xiaotian/article/details/5714477---------------------------------------------------------------------------------------------------C + + Smart pointer ExplanationFirst, IntroductionSince the C + + language does not have an automatic memory recycling mechanism, the programmer will manually delete each new memory. The programmer forgets the delete, the process is too complex, resulting in no delete, the exception causes the program to exit prematurely, and