c pointers tutorial

//PointtoMemberFunction.cpp:Defines the entry point for the console application.//#include"stdafx.h"#includeusing namespacestd;classa{ Public: voidf () {cout"f ()"Endl; } Virtual voidg () {cout"g ()"Endl; } Static voidh () {cout"h ()"Endl; }};intMainintargcChar*argv[]) {A*PA =NewA; typedefvoid(A::* PFUNCF) (void); PFUNCF TESTF= A::f;//printf ("%d\n", TESTF);(pa->*testf) (); typedefvoid(A::* PFUNCG) (void); As with normal member functions PFUNCG TESTG= a::g;//printf ("%d\n", TESTG);(p

1. Pointer to integral type#include int main (){int a=5;int *p;p=a;printf ("a=%d a=%x *p=%d p=%x \ n", a,a,*p,p);printf ("Pointer variable P's address =%x\n", p);} A a *p P 5 12ff7c 5 12ff7c p 12ff78 2. Pointer to character#include int main (){Char str[5]= "ABCD";Char *p;P=STR;printf ("str=%s p=%s str=%x *p=%c p=%x \ n", str, p, str, *p, p);printf ("Pointer variable P's

21}2223cout return 0;27}Run the result diagram as follows:Let's look at the memory allocation diagram first:It can be seen that the address of ' W ' is stored in a[0], the address of ' T ' is stored in a[1], the address of ' C ' is stored in a[2], except that these addresses are pointing to the character type, so the direct cout output string, and the address of the pointer p is stored in a[0], so *p equals a[0], All are obtained the ' W ' address, that is, 00A778CCC, and **p and a[0][0] equiva

Array of pointersAn array of pointers is a special kind of array that holds all the memory addresses of the same data type. The pointer array is defined in the form:Data type * array name [length];For example:const char *c[4] = {"We", "USA", "Rassia", "Japan"}; Defines a constant-character pointer array of length 4, pointing the array element to 4 string constants, respectivelyint i;for (i = 0; i {Puts (* (c + i)); The string that the array-pointer ar

above problem, I think of the method of using a function pointer array to solve this problem. The concept of the function pointer, as mentioned in the classic tutorial of Mr. Tam Hao's C programming, is not used in most cases and ignores its existence. The function name is actually a pointer to the entry address of the function, but it is different from the normal, such as int*, double* pointers, see the

processing function, code execution efficiency is not high. In response to the above problem, I think of the method of using a function pointer array to solve this problem.The concept of function pointers, mentioned in the classic tutorial of Mr. Tam Hao's C language program, is not used in most cases and ignores its existence. The function name is actually a pointer to the entry address of the function, b

Comparison of pointers and comparison of pointersI. Preface Some people say that pointers are the soul of the C language, and some people say that if you don't learn pointers well, it will not be the C language. In modern C ++, we recommend that you avoid using native raw pointers instead of smart pointer and reference

Preface: Description of Complex TypeTo understand pointers, some of the more complex types appear, so I first introduce how to fully understand a complex type, to understand the complex type is very simple, there will be a lot of operators in a type, they also like ordinary expressions, have priority, the same priority and operation priority, So I summed up the principle: from the variable name, according to the operator priority combination, step-by-

Pointers and Memory 2017-04-26 Why do you use pointers Pointers solve two types of software problems. First, pointers allow different parts of the code to simply share information. Copying information before and after can achieve the same effect, but pointers can better sol

Interpreting pointers in C and language pointers I think pointers are undoubtedly a challenge for many beginners who are new to C language learning. However, I think pointers are also an important feature of C language. Maybe you rarely see pointers in programming languages

Array pointers and pointers arrays are literally tangled, and sometimes I can't figure out which is an array pointer, which is an array of pointers. This thing is not by memory, we take the analysis and contrast layer stripping method analysis.1. Conceptual Differences1.1. Array pointer : The attribute is in front, the subject is behind. That is, the pointer to t

pointers, which have always been very favored in the C + + language; A C + + application that does not use pointers is almost impossible to find. The address used to store data and programs, which is the basic function of pointers. Used to point to integers, with integer pointers (int*), floating point

Objective A function that returns a pointer Second, pointers to functions Description: This C language topic is the prelude to learning iOS development. And for programmers with an object-oriented language development experience, you can quickly get started with C language. If you don't have programming experience, or are not interested in C or iOS development, please ignore.ObjectiveBefore we spent nearly 3 chapters

) Mechanism: Request a resource in the class's constructor, then use it, and finally release the resource in the destructor.Without a smart pointer, the programmer must ensure that the new object can delete at the right time, write exception capture code around to free resources, and the smart pointer can always call delete when exiting the scope (whether it is a normal process or leaving because of an exception) to deconstruct dynamically allocated objects on the heap.Let's look at the Qt famil

Detailed description of C ++ function pointers and function pointers In the process of learning c ++, pointers are difficult. After getting familiar with pointers, there is also a tough problem, that is, function pointers. This blog introduces the common function

Simply put, the pointer contains the memory address. The key to understanding pointers is to understand C's memory management patterns. There are three kinds of memory in C:①, static global memory (life cycle from the beginning of the program to the end of the program, global variables scope is global, static variable scope within the function that defines them);②, automatic memory (variables declared inside the function, created when the function is

For beginners. This is the purpose of my post. I am also a beginner (I have emphasized it for countless times). I use my understanding to write things that beginners find difficult to understand in simple languages. Since I was not good at Chinese in elementary school, I did my best to achieve this goal. Do your best. Pointers are both difficult and important in C and C ++. I only master basic in DOS. Other features of C language are similar in basic.

C/C ++ Near commands, remote pointers, and giant pointers inSong Baohua Email: 21cnbao@21cn.com sweek in our C/C ++ learning career, in our brain impression, usually only pointer concept, I seldom heard that pointers are far, near, and giant. I have never heard of near pointers, far

Clause 8: rules for the use of smart pointers familiar with more terms please go to the original article: http://blog.csdn.net/liuchang5 In chapter 1, we came into contact with the general interface reference counting rules (Clause 2 ). Before starting this chapter, let's take a look at the rules that smart pointers should follow. The rules used by smart pointers