chapter 5
object-oriented programming
2 primary characteristics of object-oriented programming are Inheritance and Polymorphism
Inheritance: allows us to group classes into families of related types, allowing for the sharing of common operations and data.
Polymorphism: allows us to program these families as a unit rather than as individual classes.
the parent is called base class and child is called derived class
1---in object-oriented programming, we indirectly manipulate the class objects through pointers or reference.(add or remove a derived class without the need for any modification to existing program)
void loan_check_in(LibMat &mat) // no LibMat object in our application
{
mat.check_in(); // mat refers to an actual object
}
2 --
Reproduced in: https: //www.cnblogs.com/ggppwx/archive/2011/01/16/1936555.html