Write a program to define the type of abstract Shape, derived by him three classes: Circle (round), a Rectangle (rectangular), Trapezoid (Trapezoid), with a function printArea respectively output the area of the three, three graphics data in the definition of object is given,

CodePudding user response:

Pleasure, pleasure

 class Shape 
{
Public: 
Virtual void printArea ()=0; 
}; 

The class Circle: public Shape 
{
Public: 
Circle (radius, float) : _radius (radius) {} 
~ Circle () {} 

Virtual void printArea () {cout & lt; <3.1415 * (_radius ^ 2) & lt; 
Private: 
Float _radius; 
}; 

Class a Rectangle: public Shape 
{
Public: 
A Rectangle (float length, float width) : _length (length), _width (width) {} 
~ a Rectangle () {} 

Virtual void printArea () {cout & lt; <_length * _width & lt; 
Private: 
Float _length; 
Float _width; 
}; 

The class Trapezoid: public Shape 
{
Public: 
Trapezoid (float float top, bottom, float height) : _top (top), _bottom (bottom), _height (height) {} 
~ Trapezoid () {} 

Virtual void printArea () {cout & lt; <(_top + _bottom) * _height/2 & lt; 
Private: 
Float _top; 
Float _bottom; 
Float _height; 
};