session 6-Abstract Class Virtual Function and Friend Function.md

1).Jaganath and his Juniours

#include <iostream>

using namespace std;

class Point{
    int px;
public:
  Point(int px){
    this->px = px;
  }

void show(){
    cout << px << endl;
  }

  friend void operator++(Point &);
};

void operator++(Point &p){
  p.px++;
}

int main() {
  int px;
  cin >> px;
  Point ob1(px);
  ++ob1;
  ob1.show();
 return 0;
}

2).Polio

#include <iostream>

using namespace std;
class country
{
    public:
    virtual void getdata() = 0;
    virtual void display() = 0;
}; 

class state:public country
{
    public:
     char a[20];
      int b,c;
      char d[20];
      int e,f;
  void getdata()
    {
      cin>>a>>b>>c>>d>>e>>f;
    }
    void display()
    {
        cout<<"Country Name "<<a;
          cout<<endl<<"Country Polio% "<<b;
          cout<<endl<<"Country Litteracy%"<<c;
          cout<<endl<<"The Measure of Interdependency "<<(float)b/c;
          cout<<endl<<"State Name "<<d;
          cout<<endl<<"%Age of Polio of State "<<e;
          cout<<endl<<"%Age of Literacy of State "<<f;
          cout<<endl<<"The Measure of Interdependency "<<(float)e/f;
   }
  };
  int main() {
    state s;
      s.getdata();
      s.display();
  return 0;
}

3).Engineering Counselling

  #include <iostream>

  using namespace std;

  class Counselling{
  int num, m1, m2, m3;
    string name;
  public:
    void read(){
      cin >> num >> name >> m1 >> m2 >> m3;
    }


      friend class enggstudent; 
    };

    class enggstudent{
        float co;
         int tot;
  public:
    void cutoff(Counselling c){
      tot = c.m1+c.m2+c.m3;
      co = (tot)/3.0;       
  }
    void display(Counselling c){
        cutoff(c);
        cout << c.num << " " << c.name << " ( " << c.m1 << " " << c.m2 << " " << c.m3 << " ) " << tot << " " << co << endl;
    }
  };

  int main() {
    int n;
   cin >> n;
   Counselling c;
   enggstudent ceg;
    cout << "Number Name Marks Total Cutoff" << endl;
    for(int i=0; i<n; i++){
        c.read();
         ceg.cutoff(c);
        ceg.display(c);
      }
   return 0;
  }

4).Shape and Measurements

#include<iostream>
using namespace std;
class Shape {
public:
virtual int getPerimeter()=0;
};

  class Rectangle:public Shape {
  public:
  int getPerimeter()
  {
    int a,b;
    cin>>a>>b;
    return 2*(a+b);
  }
};

  int main() {
  Shape *ptr = new Rectangle;
  Rectangle r;
  int perimeter;
  perimeter=r.getPerimeter();
  cout<<"Perimeter of Rectangle is: "<<perimeter;
  return 0;
}

5).Numbers

#include <iostream>

using namespace std;

class Super{
public:
   virtual void nSum()=0;
};

class Sub:public Super{
    int n, b, c;
    public:
      void read(){
      cin >> n;
  }
  void nSum(){
      cout << (n*(n-1)/2)+n << endl;
  }
  };

  int main() {

  Super *s;
  Sub sb;
  s=&sb;
  sb.read();
  s->nSum();
 return 0;
}

6).Difference Problem

  #include <iostream>

  using namespace std;
  class parent
  {
    public:
    virtual void difference(int a, int b)=0;
  };
  class child:public parent
    {
      public:
      int z;
      void difference(int a, int b)
      {
        z=a-b;
        cout<<"Difference="<<z;
      }
    };
    int main()
    {
       parent *p;
       child c;
       p=&c;
       int a,b;
        cin>>a>>b;
        p->difference(a,b);
        return 0;
    }

7).Friends in Maths tutuion

#include <iostream>
using namespace std;
class complex
{
    public:
    int a,b,c,d;
    friend void sum();
    void input()
    {
      cin>>a>>b>>c>>d;
    }
  void display()
  {
      cout<<a+c<<"+i"<<b+d;
  }
};
void sum(complex obj)
{
  }
  int main()
  {
     complex obj;
     obj.input();
     obj.display();
      return 0;
  }

8).Measure the Area

  #include <iostream> 
  using namespace std;
  class Shape
  {
      protected:
      double x, y;
      public:

      void set_dim(double i, double j=0)
      {
          x = i;
          y = j;
      }
    virtual int getArea()=0;
    };

  class Rectangle:public Shape{
  public:

  int getArea() {
      cout <<"Area of Rectangle is:"<< x * y << "\n";
  }
  };

  main(void)
  {
      Shape *p;
      Rectangle r;
      int l,b;
      cin>>l>>b;
      p = &r;
      p->set_dim(l, b);
      p->getArea();
      return 0;
      }

9).Multiples

  #include <iostream>

  using namespace std;

  class base{
  public:
  virtual void mTable()=0;
  };

  class derived:public base{
  int i1, i2;
  public:
  void input(){
      cin >> i1;
  }
  void mTable(){
      cout << i1*1 << " " << i1*2 << " " << i1*3 << " " << i1*4 << " " << i1*5 << endl;
  }
  };

  int main() {

     base *b;
     derived d;
     b=&d;
     d.input();
     b->mTable();
     return 0;
  }  

10).Super Market

#include <iostream>

using namespace std;
class consumer
{
    public:
    virtual void getdata()=0;
    virtual void display()=0;
};

class transaction:public consumer
{
  public:
      int c,q,p,tp;
      long t;
      char n[100];
      void getdata()
      {
          cin>>n>>c>>t>>q>>p>>tp;
       }
       void display()
      {
            cout<<"Name : "<<n<<endl;
            cout<<"Code : "<<c<<endl;
             cout<<"Telephone : "<<t<<endl;
            cout<<"Quantity : "<<q<<endl;
             cout<<"Price : "<<p<<endl;
            tp=q*p;
            cout<<"Total Price : "<<tp<<endl;
    }

    };

    int main()
    {
      consumer *c;
      transaction t;
       c=&t;
      c->getdata();
      c->display();
      return 0;
      }

11).Jadeja and Googly

  #include <iostream>

  using namespace std;

  class googly{
   int num;
     public:
    void getballnumber(){
     cin >> num;
    }
    friend int isgoogly(googly);
  };

  int isgoogly(googly g){
  if(g.num%2 == 0){
    cout << "Not a Googly Ball" << endl;
    return 0;
  }
  cout << "Googly Ball" << endl;
   return 1;
  }

int main() {
    googly e1;
    e1.getballnumber();
    isgoogly(e1);
    return 0;
}

12).Kajal and her Shopping

  #include <iostream>

  using namespace std;
  class Bill
    {
      public:
      int a,b;
      void getamount()
      {
          cin>>a>>b;
      }
      friend float billavg(Bill&,int,int);
      };
      float billavg(Bill& x,int a,int b)
      {
        float y;
        y=(float)(a+b);
        return y/2;
      }
      int main()
      {
      Bill obj;
      obj.getamount();
      cout<<"Average amount spent:"<<billavg(obj,obj.a,obj.b);
    return 0;
    }

13).ONGC

#include<iostream>
using namespace std;
class Employee
{public:
virtual int getSalary()=0;
};
class Developer:public Employee
{
    public:
    int salary;
    int getSalary()
    {cin>>salary;
  cout<<"Salary of Developer : "<<salary<<endl;
  }};
  class Driver:public Employee
  {public :
int getSalary()
{int salary;
cin>>salary;
cout<<"Salary of Driver : "<<salary;}};

int main() {
Developer d;
d.getSalary();
Driver w;
w.getSalary();
return 0;
}

14).Varun and his Students

#include <iostream>
using namespace std;

class parent{
public:
virtual float average(int a, int b, int c)=0;

};

class child:public parent{
public:
float average(int a, int b, int c){
return (a+b+c)/3.0f;
}
};

int main() {

parent *p;
child c;
p=&c;
int a,b,d;
cin>>a>>b>>d;
cout << "Average=" << p->average(a,b,d);
return 0;
}

15).District Sports Meet

#include <iostream>

using namespace std;
class Sports
{
  public:
    virtual void getdata();
    virtual void display();
};
void Sports::getdata()
{}
  void Sports::display()
{}
class Student:public Sports
 {
  private:
  long roll;
  string name;
  public:
  void getdata()
  {
     cin>>roll>>name;
  }
  void display()
  {
    cout<<"Student Name is: "<<name;
    cout<<"\nStudent Roll no is: "<<roll;
  }
  };
  int main() {


        Student o;

       o.Student::getdata();
       o.Student::display();
   return 0;
  }