Constructor Part-2

#include<iostream.h>
class Bulb
{
int w;
public:
void askinfo()
{
cout<<"Enter the wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}


};
void main()
{
Bulb k;
Bulb g(60);
}
---------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w;
public:
void askinfo()
{
cout<<"Enter the wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
Bulb()
{
w=0;
}


};
void main()
{
Bulb k;
Bulb g(60);
}
--------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w;
public:
void askinfo()
{
cout<<"Enter the wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
Bulb()
{
w=0;
}
Bulb(int e)
{
w=e;
}


};
void main()
{
Bulb k;
Bulb g(60);
}


---<<<Part-1---      --------Continue>>>Part-3---

Constructor Part-1

#include<iostream.h>
class Bulb
{
private:
int w;
public:
void askinfo()
{
int x;
cout<<"Enter wattage";
cin>>x;
if(x>=0&&x<=24)
{
w=x;
}
else
{
x=0;
}
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb k;
k.printinfo();
}
--------------------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w=0;    //Class level
public:
void askinfo()
{


cout<<"Enter wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb g,t;
g.printinfo();
t.printinfo();
Bulb k;
k.printinfo();
}
-----------------------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w;
public:
void initialize()
{
w=0;
}
void askinfo()
{


cout<<"Enter wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb g,t;
g.printinfo();
t.printinfo();
Bulb k;
k.printinfo();
}
-----------------------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w;
public:
Bulb()
{
w=0;
}


void askinfo()
{


cout<<"Enter wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb g,t;
g.printinfo();
t.printinfo();
Bulb k;
k.printinfo();
}
---------------------------------------------------------

#include<iostream.h>
class Bulb
{
int w;
public:
Bulb()
{
w=0;
}
Bulb(int e)
{
if(e>=0&&e<=240)
{
w=e;
}
else
{
w=0;
}
}


void askinfo()
{


cout<<"Enter wattage";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb g(60);
g.printinfo();


Bulb k;
k.printinfo();
}


Note:- Practice all and try to understand the output.
------------------ Continue >>>Part-2----

Method Overriding

Example:-1



#include<iostream.h>
class Movie
{
public:
void start()
{
cout<<"Welcome"<<endl;
}
void interval()
{
cout<<"Interval - Have coffee of Rs. 5/-"<<endl;
}
void end()
{
cout<<"Thank you - come back again"<<endl;
}
};
class jungleBook:public Movie
{
public:
void reelone()
{
cout<<"Mowgli enters the jungle"<<endl;
}
void reeltwo()
{
cout<<"Bagheera saves mowgli"<<endl;
}
};
void main()
{
jungleBook jb;
jb.start();
jb.reelone();
jb.interval();
jb.reeltwo();
jb.end();
}
-----------------------------------
Example:-2



#include<iostream.h>
class Movie
{
public:
void start()
{
cout<<"Welcome"<<endl;
}
void interval()
{
cout<<"Interval - Have coffee for Rs. 5/-"<<endl;
}
void end()
{
cout<<"Thank you - come again"<<endl;
}
};
class JungleBook:public Movie
{
public:
void reelone()
{
cout<<"Mowgli enters the jungle"<<endl;
}
void reeltwo()
{
cout<<"Bagheera saves mowgli"<<endl;
}
void interval()  //Interval method Overrided
{
cout<<"Interval- Have Pepsi for Rs.10/-"<<endl;
}
};
void main()
{
JungleBook jb;
jb.start();
jb.reelone();
jb.interval();
jb.reeltwo();
jb.end();
}
---------------------------------------------------
Example:-3



#include<iostream.h>
class Movie
{
public:
void start()
{
cout<<"Welcome"<<endl;
}
void interval()
{
cout<<"Interval- Have coffee for Rs.5/-"<<endl;
}
void end()
{
cout<<"Thank you come again"<<endl;
}
};
class JungleBook:public Movie
{
public:
void reelone()
{
cout<<"Mowgli enters the jungle"<<endl;
}
void reeltwo()
{
cout<<"Bagheera saves the mowgli"<<endl;
}
void interval()
{
interval();
cout<<"and have Pepsi for Rs.10/-"<<endl;
}
};
void main()
{
JungleBook jb;
jb.start();
jb.reelone();
jb.interval();
jb.reeltwo();
jb.end();
}
-------------------------------------------------------
Example:-4


#include<iostream.h>
class Movie
{
public:
void start()
{
cout<<"Welcome"<<endl;
}
void interval()
{
cout<<"Interval- Have coffee for Rs.5/-"<<endl;
}
void end()
{
cout<<"Thank you come again"<<endl;
}
};
class JungleBook:public Movie
{
public:
void reelone()
{
cout<<"Mowgli enters the jungle"<<endl;
}
void reeltwo()
{
cout<<"Bagheera saves the mowgli"<<endl;
}
void interval()
{
Movie::interval();
cout<<"and have Pepsi for Rs.10/-"<<endl;
}
};
void main()
{
JungleBook jb;
jb.start();
jb.reelone();
jb.interval();
jb.reeltwo();
jb.end();
}


-------------------------------------------------------------------------------

Call by Value / Reference

Call by Value:-


#include<iostream.h>
void lmn(int);
void main()
{
int x;
x=10;
lmn(x);
cout<<"Value is :"<<x<<endl;
}
void lmn(int p)
{
p=50
}
-----------------------------------------------------------
Call by Reference:-



#include<iostream.h>
void lmn(int *);
void main()
{
int x=10;
lmn(&x);
cout<<x<<endl;
}
void lmn(int *p)
{
*p=50;
}


-------------------------------------------------------------------


#include<iostream.h>
void lmn(int &);
void main()
{
int x=10;
lmn(x);
cout<<x<<endl;

}
void lmn(int &p)
{
p=50;
}

-------------------------------------------------------------

Inheritance

Program:-5


#include<iostream.h>
class Rectangle
{
int l,b;
public:
void askinfo()
{
cout<<"Enter length:";
cin>>l;
cout<<"Enter breadth:";
cin>>b;


}
void printinfo()
{
cout<<"Length:"<<l<<endl;
cout<<"breath:"<<b<<endl;
}
};
class Box:public Rectangle
{
int h;
public:
void askinformation()
{
cout<<"Enter height";
cin>>h;
}
void printinformation()
{
cout<<"Height:"<<h<<endl;
}
};
void main()
{
Box x;
x.askinfo();
x.printinfo();
x.askinformation();
x.printinformation();
}
-------------------------------------
Program:-6



#include<iostream.h>
class Rectangle
{
int l,b;
public:
void askinfo()
{
cout<<"Enter length:";
cin>>l;
cout<<"Enter breadth:";
cin>>b;


}
void printinfo()
{
cout<<"Length:"<<l<<endl;
cout<<"breath:"<<b<<endl;
}
};
class Box:private Rectangle
{
int h;
public:
void askinformation()
{
askinfo();
cout<<"Enter height";
cin>>h;
}
void printinformation()
{
printinfo();
cout<<"Height:"<<h<<endl;
}
};
void main()
{
Box x;
x.askinformation();
x.printinformation();
}
---------------------------------------

Encapsulation

Program:-3


#include<iostream.h>
class Bulb
{
private:
int w;
public :
void askinfo()
{
cout<<"Enter wattage:";
cin>>w;
}
void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb k,t;
k.askinfo();
t.askinfo();
k.printinfo();
t.printinfo();
}


------------------------------
Program:-4



#include<iostream.h>
class Bulb
{
private:
int w;
public:
void askinfo()
{
int x;
cout<<"Enter wattage:";
cin>>x;
if(x>=0 && x<=240)
{
w=x;
}
else
{
w=0;
}
}


void printinfo()
{
cout<<"Wattage is:"<<w<<endl;
}
};
void main()
{
Bulb k,t;
k.askinfo();
t.askinfo();
k.printinfo();
t.printinfo();
}


-------------------------------------------------

Polymorphism

Program:-2


#include<iostream.h>
void lmn(int,int)     ;
void lmn(int,int,int);


void main()
{
lmn(20,30);
lmn(20,30,40);
}
void lmn(int p,int q,int r)
{
int s=p+q+r;
cout<<"Total is"<<s<<endl;
}
void lmn(int p,int q)
{
int r;
r=p+q;
cout<<"Total is"<<r<<endl;
}

Simplicity Introduced In C++

Program:- 1


#include<iostream.h>
void main()
{
cout<<"Enter a number";
int x;
cin>>x;
cout<<"Enter another number";
int y;
cin>>y;
int z;
z=x+y;
cout<<"Total is"<<z<<endl;
}