c pointers tutorial

The return value of a function pointer is an array of pointers, where the return value of an int function pointer is an array of pointers, and an int pointer is placed in the array.#include #include voidFunintA) {printf ("fun:%d\ n", a);}voidFUN1 (void(*f) (int),intA) {f (a);}intGunintA) {printf ("gun:%d\ n", a);}intGUN1 (intAint(*f) (int) {printf ("gun1:%d\ n", a);}int(*hun (inta)) []{int(*p) [3] = (int(*)

The concept of pointers The pointer is the address that can be used to find the specified data Pointers are addresses, so when used, it's often easy to say pointer variables are pointers A pointer variable is a variable that stores an address int *p1;//applies a variable that opens up a chunk of memory in memory and stores the data Opens up 8 bytes, and the

const* P2;/* Defines a const pointer (must be initialized because the value of the pointer itself cannot be changed) * *int* Const p3=a;/* The pointer itself and the content it points to can not be changed, so also have to initialize the * *Const int* Const p4=a;int const* Const p5=b;p1=p2=a; That's right*p1=*p2=8; Incorrect (the pointer points to content cannot be modified)*p3=5; That's rightP3=P1; Incorrect (the value of the pointer itself cannot be changed)p4=p5;//is incorrect (the pointer i

The nature of the pointer array and the pointer function is unchanged, or arrays and functions. and the array pointer and function pointer, which is the indication that this is the pointer, points to the types of arrays and functions respectively. One Array of pointers: the array that is used to store pointers, that is, the array elements are pointers Char Const

internal copy does not change the P itself. Similar to the outside of the function is an int *p, inside is an int * tmpp, both inside the content is the same, that is the real address, but the address of the two itself is not the same, the changes to TMPP will not affect the p. You can do this by using pointers to pointers. int **p; In the function, the first solution to the reference, actually get the tru

These two days have been asked many times about this aspect of the problem, I have been not very understanding, and did not answer well, now to sweep their own blind. //The following are mostly reproduced, mixed with a few personal views, if inappropriate please inform. Array pointers (row pointers)define INT (*p) [n];() high priority, the first explanation is that p is a pointer to an integer one-dimensio

An array is a contiguous set of data, which can be traversed by the arithmetic operation of the pointer, which in turn points to each element of the array.Defines a pointer to an array element: int a[], *PA; PA=a[0]; or pa=a;After the above definition and assignment:*pa is a[0],* (pa+1) is a[1], ..., * (Pa+i) is a[i].A[i], * (pa+i), * (A+i), pa[i] are equivalent.//example 6-7 (1) using array names and subscripts to access array elements#include using namespacestd;intMain () {inta[Ten] = {1

The best way to understand a thing is to know its purpose. My understanding of pointers is simply one sentence: If you change the value of a variable (including basic variables, struct, classes, pointers) when calling a function ), then you need its pointer. Since C/C ++ always copies a parameter when calling a function, you cannot change the original content (Java references objects ). Therefore, you need

Reference: Baidu Encyclopedia | function pointer | entry.Pointer _ function, do not say. Oneself feel is so-easy. [Declaration format: ReturnType *function (arguments);]The focus is on the function pointer, and an array of function pointers that suddenly pops up; (specifically, I'm used to writing code first, then commenting; case A: The code is left, the comment is to the right.) Case B: The code is on, the comment is under. )function pointer , my im

In-depth understanding of Pointers-) differences between pointer functions and function pointers I, During the learning process, I found that this "pointer function" and "function pointer" are prone to errors. So today, I want to figure it out and find some information, first, the definitions between them: 1. A pointer function is a function with a pointer. A function returns a pointer of a certain type. Ty