#include < iostream >
using namespace std;
class Area
{
int 1, b, a;
public:
area( );
area(int);
area(int, int);
area(area&);
void calculate ( )
};
area: .area ( )
{
cout < < "\n Enter the value of length and breath";
cin > > 1 > > b;
cout < < "\n\n non parameterized constructor";
}
area :: area (int c)
{
1=b=c;
cout < < "\n\n non parameterized constructor with one argument";
}
area ::area(int 11, int b 1)
{
cout < < "\n\n Non parameterized constructor with two argument";
1=11;
b=b1
}
area :: area(area & a)
{
=a1;
1= a.b;
cout < < "\n\n copy constructor";
}
void area::calculate ( )
{
a = 1*b;
cout < < a;
}
int main ( )
{
area obj;
cout < < "\n area of Rectangle is";
obj.calculate ( )
area obj1(2);
cout < < "\n area of Rectangle";
obj 1.calculatet);
area obj2 (2,3);
cout < < "\n area of Rectangle";
obj2.calculatet);
area obj3 (obj2); .
cout < < "\n area of Rectangle";
obj3.calculate ( );
return 0;
}
Output:
Enter the value of length and breadth 10 20
Non parameterized constructor area of Rectangle is 60
Parameterized constructor with one argument area of Rectangle 8
Parameterized constructor with two argument area of Rectangle 10
copy constructor area of Rectangle 10

#include< iostream >
using namespace std;
class add
{
int num1, num2, sum;
public:
add ( )
{
cout < < "\n Constructor without parameters ...";
num1=0;
num2=0;
sum=0;
}
add (int s1, int s2)
{
cout < < "\n Parameterized constructor ...";
num1= s1;
num2=s2;
sum=0;
}
add (add &a)
{
cout < < "\n Copy Constructor ...";
num1= a.num1;
num2=a.num2;
sum=0;
}
void getdata ( )
{
cout < < "\n Enter data ...";'
cin > > num 1 > > num2;
}
void addition ( )
{
sum=num1+num2;
}
void putdata ( )
{
cout < < "\n The numbers are ..";
cout< <num 1 < < '\t' < < num2;
cout < < "\n The sum of the numbersare .."< < sum;
}
};
int main ( )
{
add a, b (10, 20) , c(b);
a.getdata ( );
a.addition( );
b.addition( );
c.addition( );
cout< < "\n Object a:";
a.putdatat);
cout < < "\n Object b :";
b.putdata( );
cout < < "\n Object c..";
c.putdata( );
return 0;
}

#include < bit sf std C++.h >
using namespace std;
class Greeks
{
Public:
void func(int x)
{
cout < < "value of';
}
void func(double x)
{
cout < < "value of';
}
void func(int X, int)
{
cout < < "value of';
}
};
int inain ( )
{
Greeks obj 1;
obj 1.func(7);
obj 1.func(9 .132);
obj 1.func(85, 64);
return 0;
}
Output
value of x is 7
value of x is 9.132
value of x and y is 85, 64

#include< string.h >
#include< iostram >
using namespace std;
class strings
{
public:
char s[20];
void getstring( char str[])
{
strcpy(s,str);
}
void operator+(strings);
};
void strings::operator+(strings ob)
{
strcat(s,ob.s);
cout << "\nConcatnated String is:"<< s;
}
intmain()
{
strings ob 1, ob2;
char string 1 [10], string2[10];
cout << "\nEnter First String:";
cin>>string 1 ;
ob1.getstring(string 1);
cout << "\nEnter Second String:";
cin>>sting 2;
ob2.getstring(string2);
//Calling + operator to Join/Concatenate strings
obl +ob2;
return 0;
}
Output:
Enter First String:COMPUTER
Enter Second String:SCIENCE
Concatenated String is:COMPUTERSCIENCE

//Complex number addition and subtraction
#include < iostream >
using namespace std;
class complex
{
int real, img;
public;
void readt)
{
cout << "\nEnter the REAL PART :";
cin >> real;
cout << "\nEnter the IMAGINARY PART :";
cin >> img;
}
complex operator +( complex c2)
{
complex c3;
c3.real=real-c2.real;
c3 .img=img-c2.img;
return c3;
}
void display()
{
cout << real << "+" << img << "i";
}
};
int maim)
{
complex c 1,c2,c3;
int choice, cout;
do
{
cout << "\t\tCOMPLEX NUMBERS\n\n1.
ADDITION\n\n2.SUBTRACTION\n\n";
cout << "\nEnter your choice:";
cin>>choice;
if(choice== 1llchoice=2)
{
cout << "\n\nEnter the First Complex Number";
c1.read();
cout << "\n\nEnter the Second Complex
Number";
c2.readO;
}
switch( choice)
{
case 1 :c3=c1 +c2; //binary + overloaded
cout << "\n\nSUM .= ";
c3.dispaly();
break;
case 2 :c3=cl-c2; //binary -overloaded
cout << "\n\nResult = ";
c3.display();
break;
default :cout << "\n\nUndefined Choice";
}
cout«"\n\nDo You Want to Continue?
(1-Y,0-N)";
cin>>cout;
}while(cout==1);
return 0;
}