Answer the given question with a proper explanation and step-by-step solution. C++ Virtual Methods Create the following 3 classes: 1. AppWindow class, containing: - A protected instance of a rectangle class Rect defining the AppWindow's position (x,y) and size (w,h). (You may use the Rect class you developed in the previous lab. In main(), the width and height are assumed to be public and called "w" and "h".) - The following constructors to initialize the dimensions: AppWindow(); // initialize member rect's dimensions to 0 AppWindow( float x, float y, float w, float h ); // initialize member rect's dimensions with the 4 floats AppWindow( const Rect& r ); // initialize member rect's dimensions with r's dimensions - A method to retrieve the member rectangle: const Rect& get_rect(); - A virtual method called resize(). When this method is called, your implementation is supposed to change the dimensions of the internal rectangle of the window. virtual void resize( int w, int h ); 2. CircleWin class, which inherits from AppWindow, containing: - A protected float called "radius". For this class, radius is considered to be the maximum dimension among w and h of the rectangle. - The same three constructors as AppWindow. You should only initialize the value of radius in this class, after using AppWindow's constructor to initialize the inherited rectangle. (Recall the initializer list.) - An overriden resize() method such that it will recompute the radius and print it out like this: "radius: ", where is the maximum dimension. Remember to still change the dimensions of the internal rectangle. 3. RectWin class, which also inherits from AppWindow, containing: - A protected float called "area". The area is equal to w * h. - The same three constructors as AppWindow. You should only initialize the value of area in this class, after using AppWindow's constructor to initialize the inherited rectangle. (Again, recall the initializer list.) - An overriden resize() method such that it will recompute the area and print it out like this: "area: ". Remember to still change the dimensions of the internal rectangle. Upload your three classes in a single header file named App.h. Your code will be tested for correctness using the file virtualMethods.cpp. SAMPLE OUTPUT radius: 4 radius: 10 area: 12 area: 40 virtualMethods.cpp #include #include #include "App.h" using namespace std; int main( int argc, const char* argv[] ) { Rect r( 2, 0, 4, 5 ); vector w; w.push_back( new CircleWin( 1, 1, 3, 2 ) ); w.push_back( new CircleWin( r ) ); w.push_back( new RectWin( 1, 1, 2, 3 ) ); w.push_back( new RectWin( r ) ); for( int i = 0; i < w.size(); i++ ) w[i]->resize( w[i]->get_rect().w, w[i]->get_rect().h * 2 ); return 0; }
Types of Loop
Loops are the elements of programming in which a part of code is repeated a particular number of times. Loop executes the series of statements many times till the conditional statement becomes false.
Loops
Any task which is repeated more than one time is called a loop. Basically, loops can be divided into three types as while, do-while and for loop. There are so many programming languages like C, C++, JAVA, PYTHON, and many more where looping statements can be used for repetitive execution.
While Loop
Loop is a feature in the programming language. It helps us to execute a set of instructions regularly. The block of code executes until some conditions provided within that Loop are true.
Answer the given question with a proper explanation and step-by-step solution.
C++
Virtual Methods
Create the following 3 classes:
1. AppWindow class, containing:
- A protected instance of a rectangle class Rect defining the AppWindow's position (x,y) and size (w,h). (You may use the Rect class you developed in the previous lab. In main(), the width and height are assumed to be public and called "w" and "h".)
- The following constructors to initialize the dimensions:
AppWindow(); // initialize member rect's dimensions to 0
AppWindow( float x, float y, float w, float h ); // initialize member rect's dimensions with the 4 floats
AppWindow( const Rect& r ); // initialize member rect's dimensions with r's dimensions
- A method to retrieve the member rectangle:
const Rect& get_rect();
- A virtual method called resize(). When this method is called, your implementation is supposed to change the dimensions of the internal rectangle of the window.
virtual void resize( int w, int h );
2. CircleWin class, which inherits from AppWindow, containing:
- A protected float called "radius". For this class, radius is considered to be the maximum dimension among w and h of the rectangle.
- The same three constructors as AppWindow. You should only initialize the value of radius in this class, after using AppWindow's constructor to initialize the inherited rectangle. (Recall the initializer list.)
- An overriden resize() method such that it will recompute the radius and print it out like this: "radius: <max>", where <max> is the maximum dimension. Remember to still change the dimensions of the internal rectangle.
3. RectWin class, which also inherits from AppWindow, containing:
- A protected float called "area". The area is equal to w * h.
- The same three constructors as AppWindow. You should only initialize the value of area in this class, after using AppWindow's constructor to initialize the inherited rectangle. (Again, recall the initializer list.)
- An overriden resize() method such that it will recompute the area and print it out like this: "area: <area>". Remember to still change the dimensions of the internal rectangle.
Upload your three classes in a single header file named App.h. Your code will be tested for correctness using the file virtualMethods.cpp.
SAMPLE OUTPUT
radius: 4
radius: 10
area: 12
area: 40
virtualMethods.cpp
#include <iostream>
#include <
#include "App.h"
using namespace std;
int main( int argc, const char* argv[] )
{
Rect r( 2, 0, 4, 5 );
vector<AppWindow*> w;
w.push_back( new CircleWin( 1, 1, 3, 2 ) );
w.push_back( new CircleWin( r ) );
w.push_back( new RectWin( 1, 1, 2, 3 ) );
w.push_back( new RectWin( r ) );
for( int i = 0; i < w.size(); i++ )
w[i]->resize( w[i]->get_rect().w, w[i]->get_rect().h * 2 );
return 0;
}
Trending now
This is a popular solution!
Step by step
Solved in 6 steps with 3 images
