C++中基类和派生类的区别

基类：基类是面向对象编程语言中的一个类，从该类派生出其他类。继承基类的类具有基类的所有成员，也可以具有一些附加属性。基类成员和成员函数继承到派生类的Object。基类也称为父类或超类。
派生类：从现有类创建的类。派生类继承基类的所有成员和成员函数。派生类相对于 Base 类可以具有更多功能，并且可以轻松访问 Base 类。派生类也称为子类或子类。
创建派生类的语法：

class BaseClass{
  // members....
  // member function 
}
     
class DerivedClass : public BaseClass{
  // members....
  // member function 
}

基类和派生类的区别：

S.No.	BASE CLASS	DERIVED CLASS
1.	A class from which properties are inherited.	A class from which is inherited from the base class.
2.	It is also known as parent class or superclass.	It is also known as child class subclass.
3.	It cannot inherit properties and methods of Derived Class.	It can inherit properties and methods of Base Class.
4.	Syntax: Class base_classname{ … }.	Syntax: Class derived_classname : access_mode base_class_name { … }.

下面是说明Base Class和Derived Class 的程序：

CPP

// C++ program to illustrate
// Base & Derived Class
 
#include 
using namespace std;
 
// Declare Base Class
class Base {
public:
    int a;
};
 
// Declare Derived Class
class Derived : public Base {
public:
    int b;
};
 
// Driver Code
int main()
{
    // Initialise a Derived class geeks
    Derived geeks;
 
    // Assign value to Derived class variable
    geeks.b = 3;
 
    // Assign value to Base class variable
    // via derived class
    geeks.a = 4;
 
    cout << "Value from derived class: "
         << geeks.b << endl;
 
    cout << "Value from base class: "
         << geeks.a << endl;
 
    return 0;
}

输出：

Value from derived class: 3
Value from base class: 4

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