What is the difference between C ++ class and struct?

The C language struct keyword is retained in C ++ and expanded. In C language, struct can only contain member variables, not member functions. In C ++, struct is similar to class and can contain both member variables and member functions.

struct能包含成员函数吗？ 能！

struct能继承吗？ 能！！

struct能实现多态吗？ 能！！！

#include <iostream>
using namespace std;

struct A
{
public:
    A() { cout << "A construct..." << endl;}
    virtual ~A(){ cout << "A deconstruct..." << endl;}
};

struct B: public A
{
public:
    B() { cout << "B construct..." << endl;}
    ~B(){ cout << "B deconstruct..." << endl;}
};

int main()
{
    A *a = new B();
    delete a;
    return 0;
}
// A construct...
// B construct...
// B deconstruct...
// A deconstruct...

The struct and class in C ++ are basically universal, only a few details are different:

使用 class 时，类中的成员默认都是 private 属性的；而使用 struct 时，结构体中的成员默认都是 public 属性的。
class 继承默认是 private 继承，而 struct 继承默认是 public 继承。
class 可以使用模板，而 struct 不能。

C ++ did not abandon the struct keyword in the C language, its significance is to give the C language program developers a sense of belonging, and make the C ++ compiler compatible with projects previously developed in the C language.

When writing C ++ code, I strongly recommend using class to define the class and struct to define the structure, which makes the semantics more clear.

What is the difference between C ++ class and struct?

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