How does a C++ pointer reference an object?

In C++, a pointer can refer to an object. The steps include: declaring a pointer variable, obtaining the object address and assigning it to the pointer. This allows programmers to access and modify an object's properties and methods through pointers.

C++ Pointer Reference Object

In C++, a pointer is a data type that stores the address of another variable or object . Pointers can refer to objects, allowing us to access and modify the object's data in a way that references the object.

Usage:

To make a pointer refer to an object, the following steps are required:

1. Declare a pointer variable with the same type as the one to be referenced The object types are the same.
2. Use the address operator (&) to get the address of the object.
3. Assign the address of the object to the pointer variable.

Grammar:

<对象类型>* 指针名 = &对象;

Practical case:

Suppose there is a person named Person A class that contains name and age data members. We create a Person object and then reference it using a pointer.

#include <iostream>

class Person {
public:
    std::string name;
    int age;
};

int main() {
    Person person = {"Alice", 25};

    // 声明一个指向 Person 对象的指针
    Person* personPtr = &person;

    // 使用指针访问对象的属性
    std::cout << "Name: " << personPtr->name << std::endl;
    std::cout << "Age: " << personPtr->age << std::endl;

    // 通过指针修改对象的属性
    personPtr->age++;
    std::cout << "Updated Age: " << personPtr->age << std::endl;

    return 0;
}

Run result:

Name: Alice
Age: 25
Updated Age: 26

In this case, personPtr points to the person object, allowing us to pass the pointer Access and modify data members of person.

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