Write a C++ program to calculate area of circle,sphere and cylinder using base class round-shape

Create a base class round-shape(radius). define three different
shapes as circle, sphere and cylinder(height) from round-shape.
class round-shape
{
protected :float radius;
public:static float pi;
round-shape(float)//default argument
virtual float area()=0;
}
Write a C++ program to calculate area of circle,sphere and cylinder



#include<iostream.h>
#include<conio.h>
class round
{
protected:float radius;
public:static float pi;
       round(float r=0)
       {
       cout<<"\n Enter the radius:-";
       cin>>r;
       radius=r;
       }
       virtual float area()=0;
       };
class circle:public round
{
public:float circle;
       float area()
       {
       circle=pi*radius*radius;
       cout<<"\n Area of circle:-"<<circle;
       return 0;
       }
       };
class sphere:public round
{
public:float sph;
       float area()
       {
       sph=4*pi*radius*radius;
       cout<<"\n Area of sphere:-"<<sph;
       return 0;
       }
};
class cylinder:public round
{
public:float ac;
       float h;
public:cylinder(float height=0)
       {
       cout<<"\n Enter height:-";
       cin>>height;
       h=height;
       }
       float area()
       {
       float tsac,csac,vc,acbc;
       tsac=2*pi*radius*(h+radius);
       csac=2*pi*radius*h;
       vc=pi*radius*radius*h;
       acbc=pi*radius*radius;
       ac=tsac+csac+vc+acbc;
       cout<<"Area of cylinder is:-"<<ac;
       return 0;
       }
};
float round::pi=3.14;
int main()
{
int height;
clrscr();
cout<<"\n\t\t To calculate area of circle\n\n";
circle c;
c.area();
cout<<"\n\t\t To calculate area of sphere\n\n";
sphere s;
s.area();
cout<<"\n\t\t To calculate area of cylinder\n\n";
cylinder cl;
cl.area();
getch();
return 0;
}






============================================
OUTPUT

                To calculate area of circle                                    
                                                                               
                                                                               
Enter the radius:-1                                                           
                                                                               
Area of circle:-3.14         
                                                 
                To calculate area of sphere                                    
                                                                               
                                                                               
Enter the radius:-1                                                           
                                                                               
Area of sphere:-12.56  
                                                       
                To calculate area of cylinder                                  
                                                                               
                                                                               
Enter the radius:-1                                                           
                                                                               
Enter height:-1
Area of cylinder is:-25.120001

Write a cpp program for car passing through toll booth

Imagine a tollbooth at a bridge. a car passing by the booth
is expected to pay a toll. the tollbooth keeps the track of the number
car that gone and total cash amount collected.
create a class tollbooth with the data member
-total number of cars passed
-total toll collected
write necessary member function
1.a constructor that initializes both data member to zero.
2.paying ca(): when any cars passes through the tollbooth. that much
toll gets added into total toll collected and total number of cars passed is
incremented by one
3. nonpaying car(); increment the car total but adds nothing to cash total
4.display(); the total number car passed and total cash collected


#include<iostream.h>
#include<conio.h>
class toolbath
{
int noc,tot;
public:tollbooth(int n=0,int t=0)
       {
       noc=n;
       tot=t;
       }
       void pay()
       {
       int i;
       noc++;
       cout<<"\n Enter the amount to pay toll:-";
       cin>>i;
       tot=tot+i;
       }
       void non_pay()
       {
       noc++;
       }
       void display()
       {
       cout<<"\n Total number of car passed:-"<<noc;
       cout<<"\n Total toll collected:-"<<tot;
       }
};
int main()
{
int n,t,ans;
char ch='y';
clrscr();
cout<<"\n Enter total number of car passed:-";
cin>>n;
cout<<"\n Enter total toll collected:-";
cin>>t;
tollbooth b(n,t);
while(ch=='y'||ch=='Y')
{
cout<<"\n Enter the car type:-";
cout<<"\n Press 1: for paying car";
cout<<"\n Press 2: for non-paying car";
cin>>ans;
if(ans==1)
b.pay();
if(ans==2)
b.non_pay();
cout<<"\n Do you want to continue(Y|N):-";
cin>>ch;
}
b.display();
getch();
return 0;
}

=========================================================

OUTPUT

Enter total number of car passed:-123                                          
                                                                               
Enter total toll collected:-7478                                               
                                                                               
Enter the car type:-                                                           
Press 1: for paying car                                                        
Press 2: for non-paying car1                                                   
                                                                               
Enter the amount to pay toll:-12                                               
                                                                               
Do you want to continue(Y|N):-y                                                
                                                                               
Enter the car type:-                                                           
Press 1: for paying car                                                        
Press 2: for non-paying car1                                                   
                                                                               
Enter the amount to pay toll:-14                                               
                                                                               
Do you want to continue(Y|N):-y                                                

Enter the car type:-
Press 1: for paying car
Press 2: for non-paying car2

Do you want to continue(Y|N):-n

Total number of car passed:-126
Total toll collected:-7504