Usage of arrow operator -> in C++

There are different types of operators in C++ such as assignment operators, arithmetic operators, relational operators, logical operators, bitwise operators and many others. The arrow operator
, -> also known as the class member access operator, is a combination of two different operators, the minus operator (-) and the greater than operator (>). It is used to access public members of a class, structure or union members with the help of pointer variables.

access structure

pointer -> class_member_name

Here is the assignment statement and access output:

#include <iostream>
using namespace std;

struct Person
{
    char name[20];
    int age;
};

int main()
{
    // 创建结构体的指针对象
    struct Person *info = NULL;

    //动态分配内存
    info = (struct Person *)
        malloc(sizeof(struct Person));

    //箭头操作符用于赋值
    info->age = 17;

    //访问成员变量
    cout << "The age of the Person is = " << info->age;

    return 0;
}

Program output:

The age of Person is = 17

access class

#include <iostream>
using namespace std;

// 创建一个类
class Student {
    private:
        // 声明私有成员
        int total_marks;
        float total_percentage;

    public:
        // 计算百分比
        void percentage(int total_marks)
        {
            this->total_marks=total_marks;
            total_percentage = (total_marks*100)/500;
        }
        //输出
        void print()
        {
            cout<<"Total percentage of the Student: "<<endl;
            cout<<total_percentage<<"%";
        }

};
 
int main()
{
   
    Student *s = new Student();
 
    // 访问类的成员函数
    s->percentage(387);
    s->print();
 
    return 0;
}

Program output:

Total percentage of the student: 
77%

visit union

#include <iostream>
using namespace std;

union Student
{
    string name;
    int roll;
};

int main()
{

    union Student *st = NULL;
    
    st = (union Student *)
        malloc(sizeof(union Student));

    // 给成员赋值
    st->roll = 21;

    // 打印值
    cout << "Roll: " << st->roll;
}

Program output:

Roll: 21

Regarding the difference between arrow operators and dot operators , please refer to:
https://www.scaler.com/topics/arrow-operator-in-cpp/