C ++ study Note 5

 

Add some functions to the simple graphics system: Perimeter (), area () and volume () to calculate its perimeter, area and volume (only for threedimentionalshape) respectively; a function draw () to draw a shape with different colors, thickness and styles.

A simple graphic system can be created to provide the following functions:

? Perimeter (): calculates the graph perimeter;
? Area (): calculates the image area;
? Volume (): calculates the image volume (only for 3D images );
? Draw (): draws a graph.
Note:
1. Use of polymorphism;
2. Only the feature information can be output when drawing a graph, without the need to draw a specific graph.

 

// BookProgramDebug through vcsp6

# Include <iostream>
# Include <math. h>
Using namespace STD;
Const double Pi = 3.1415926;

class shape // define the shape abstract class
{< br>
Public:
virtual float perimeter () = 0;
virtual float volume () = 0; // define the volume function
virtual float area () = 0; // define the area function
virtual void disp () = 0; // define the output function
virtual void draw () = 0;
};

Class rectangle: Public shape // defines the rectangular derived class
{
Public:
Void setvalue (int m, int N)
{
X = m;
Y = N;
}
Float area () // The definition version of the virtual function in the rectangle class
{
Sr = x * Y;
Return 1;
}
Float perimeter ()
{
PR = 2 * (x + y );
Return 1;
}
Float volume ()
{
Return 1;
}
Void disp ()
{
Cout <"rectangular area =" <Sr <Endl;
Cout <"rectangular perimeter =" <Pr <Endl;
}
Void draw ()
{
Cout <"draw a rectangle." <Endl;
}

PRIVATE:
Double SR;
Double X, Y;
Double PR;
};

Class circle: Public shape // defines the derived class of the circle
{
Public:
Void setvalue (INT m)
{
X = m;
}
Float perimeter ()
{
PC = 2 * pI * X;
Return 1;

}
Float volume ()
{
Return 1;
}
Float area () // The definition version of the virtual function in the circle class
{
SC = pI * x * X;
Return 1;
}
Void disp ()
{
Cout <"Area of the Circle =" <SC <Endl;
Cout <"circle perimeter =" <Pc <Endl;
}
Void draw ()
{
Cout <"draw a circle." <Endl;
}
PRIVATE:
Double SC;
Double X;
Double PC;

};

Class sphere: Public shape // defines the derived class of the ball
{
Public:
Void setvalue (INT m)
{
X = m;
}
Float volume ()
{
Vs = 4/3 * pI * x * X;
Return 1;
}
Float perimeter ()
{
Return 1;
}
Float area ()
{
As = 4 * pI * x * X;
Return 1;
}
Void disp ()
{
Cout <"ball volume =" <vs <Endl;
Cout <"Ball Surface Area =" <as <Endl;

}
Void draw ()
{
Cout <"draw a sphere." <Endl;
}
PRIVATE:
Double;
Double X;
Double;
};

Class cuboid: Public shape // defines the cube class
{
Public:
Void setvalue (int l, int W, int H)
{
X = L;
Y = W;
Z = h;
}
Float volume ()
{
VC = x * y * z;
Return 1;
}
Float area ()
{
AC = 2 * (x * Y + x * z + y * z );
Return 1;
}
Void disp ()
{
Cout <"cube volume =" <VC <Endl;
Cout <"cube surface area =" <AC <Endl;
}
Float perimeter ()
{
Return 1;
}
Void draw ()
{
Cout <"draw a cuboid." <Endl;
}

PRIVATE:
Double X, Y, Z;
Double VC, AC;
};

Int main ()
{
Rectangle R; // defines a rectangle class object.
Circle C; // defines a circle object.
Sphere S; // defines the ball object
Cuboid Cu; // defines the rectangular object
Int x, y, z;
Int choice; // used to receive the selected option number

Do {// loop selection Option
Cout <"1. rectangular area and perimeter" <Endl; // display the selection menu
Cout <"2. Calculate the area and perimeter of the circle" <Endl ;;
Cout <"3. Ball volume and surface area" <Endl ;;
Cout <"4. estimate the volume and surface area of the cube" <Endl ;;
Cout <"0. Exit" <Endl ;;
Cout <"select function (0-4 ):";
Cin> choice; // enter the option number.
If (choice = 1)
{Cout <"Enter the length and width of the rectangle :";
Cin> x> Y;
R. setvalue (x, y );
R. Area ();
R. Perimeter ();
R. disp ();
R. Draw ();
}

If (choice = 2)
{Cout <"enter the circle radius :";
Cin> X;
C. setvalue (X );
C. Area ();
C. Perimeter ();
C. disp ();
C. Draw ();

}
If (choice = 3)
{
Cout <"Enter the ball radius :";
Cin> X;
S. setvalue (X );
S. Volume ();
S. Area ();
S. disp ();
S. Draw ();

}
If (choice = 4)
{
Cout <"Enter the length, width, and height of the cube (in order ):";
Cin> x> Y> Z;
CU. setvalue (x, y, z );
CU. Volume ();
CU. Area ();
CU. disp ();
CU. Draw ();
}
Cout <Endl;

} While (choice! = 0 );

Return 0;
}