c ++ 函數(shù)的esp指針

Create a class along with data member and member functions and then access the member functions by using a pointer in C++.

創(chuàng)建一個(gè)類(lèi)以及數(shù)據(jù)成員和成員函數(shù)，然后使用C ++中的指針訪問(wèn)成員函數(shù)。

如何通過(guò)指針訪問(wèn)成員函數(shù)？ (How to access a member function by pointer?)

To access a member function by pointer, we have to declare a pointer to the object and initialize it (by creating the memory at runtime, yes! We can use new keyboard for this).

要通過(guò)指針訪問(wèn)成員函數(shù) ，我們必須聲明一個(gè)指向該對(duì)象的指針并將其初始化(通過(guò)在運(yùn)行時(shí)創(chuàng)建內(nèi)存，是的！我們可以為此使用新鍵盤(pán))。

The second step, use arrow operator -> to access the member function using the pointer to the object.

第二步，使用箭頭運(yùn)算符->使用指向?qū)ο蟮闹羔樤L問(wèn)成員函數(shù)。

Syntax:

句法：

//pointer to object declaration class_name *pointe_name; //memory initialization at runtime pointer_name = new class_name; //accessing member function by using arrow operator pointer_name->member_function();

Example:

例：

In the below example - there is a class named Number with private data member num and public member functions inputNumber(), displayNumber().

在下面的示例中-有一個(gè)名為Number的類(lèi)，具有私有數(shù)據(jù)成員num和公共成員函數(shù)inputNumber()和displayNumber() 。

In the example, we are creating simple object N and a pointer to the object ptrN and accessing the member functions by using simple object N and the pointer to the object ptrN.

在該示例中，我們將創(chuàng)建簡(jiǎn)單對(duì)象N和指向?qū)ο髉trN的指針，并通過(guò)使用簡(jiǎn)單對(duì)象N和指向?qū)ο髉trN的指針來(lái)訪問(wèn)成員函數(shù)。

Program:

程序：

#include <iostream> using namespace std;class Number {private:int num;public://constructorNumber(){ num=0; };//member function to get inputvoid inputNumber (void){cout<<"Enter an integer number: ";cin>>num;}//member function to display number void displayNumber(){cout<<"Num: "<<num<<endl;} };//Main function int main() {//declaring object to the class numberNumber N;//input and display number using norn objectN.inputNumber();N.displayNumber();//declaring pointer to the object Number *ptrN;ptrN = new Number; //creating & assigning memory //printing default valuecout<<"Default value... "<<endl;//calling member function with pointer ptrN->displayNumber();//input values and print ptrN->inputNumber();ptrN->displayNumber();return 0; }

Output

輸出量

Enter an integer number: 10 Num: 10 Default value... Num: 0 Enter an integer number: 20 Num: 20

Explanation:

說(shuō)明：

The main three steps needs to be understood those are:

需要理解的主要三個(gè)步驟是：

Pointer to object creation: Number *ptrN;

指向?qū)ο髣?chuàng)建的指針： Number * ptrN;

Dynamic memory initialization to the pointer object: ptrN = new Number;

指針對(duì)象的動(dòng)態(tài)內(nèi)存初始化： ptrN = new Number;

Accessing member function by using "Arrow Operator": ptrN->displayNumber();

通過(guò)使用“箭頭運(yùn)算符”訪問(wèn)成員函數(shù)： ptrN-> displayNumber();

翻譯自: https://www.includehelp.com/cpp-programs/accessing-member-function-by-pointer.aspx

c ++ 函數(shù)的esp指針

總結(jié)

以上是生活随笔為你收集整理的c ++ 函数的esp指针_在C ++中通过指针访问成员函数的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。