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C++ Operator Overloading

What is operator overloading
Rules for overloading Operators
Operator Overloading restrictions
List of operators that cannot be overloaded.
Overloading Unary operator
Overloading increment operator(++)
Overloading decrement operator(–)
Overloading unary operator(-)
Overloading increment operator(++) postfix
Overloading decrement operator(–) postfix
Overloading increment operator (++) with friend function
Overloading increment operator (–) with friend function
Increment the time using ++
Decrement the time using ++
Overloading Binary operator(+,-,*,/,%)
Add two object using “+” operator with friend function
Overloading “-” operator
Overloading “*” operator
Overloading “/” operator
Overloading “%” operator
overloading all (+,-,*,/,%)
Overloading “+” operator with friend function
class distance (feet,inches) with “+” operator
class distance (feet,inches) with “+” operator with friend function
class distance (km,m) with “+” operator
class distance (km,m) with “+” operator with friend function
class distance (m,cm) with “+” operator
class distance (m,cm) with “+” operator with friend function
class distance (km,m,cm) with “+” operator
class distance (km,m,cm) with “+” operator with friend function
class distance (km,m,cm,mm) with “+” operator
class distance (km,m,cm,mm) with “+” operator with friend function
class time(hh,mm,ss) with “+” operator
class time(hh,mm,ss) with “+” operator with friend function
class complex(real,ing) with “+” operator
class complex(real,ing) with “+” operator with friend function
class string(str) with “+” operator
class string(str) with “+” operator with friend function
overloading “+=” operator

C++:Overloading operators (+=, -=, *=, /=, %=)

Overloading operators (+=, -=, *=, /=, %=)

Example:1
Add two objects using the overloaded operator “+=”.

// to overload +=
// add two objects using "+=" operator
//without friend function

#include<iostream>
#include<conio.h>
using namespace std;
class sample
{
	int a;
public:
	sample();
	sample(int n);
	void get();
	void disp();
	void operator+=(sample s);
};
sample::sample()
{
	a=0;
}
sample::sample(int n)
{
	a=n;
}
void sample::get()
{
	cout<<"Enter the value of a ";
	cin>>a;
}
void sample::disp()
{
	cout<<"a= "<<a<<endl;
}
void  sample::operator+=(sample s)
{
	a+=s.a;
}
int main()
{
	sample s1,s2;
	s1.get();s2.get();
	s1.disp();s2.disp();
	//+=
	cout<<"sum"<<endl;
	s2+=s1;//s2.operator+=(s1);
	s2.disp();
	getch();
	return(0);
}

Output:

Enter the value of a 10
Enter the value of a 20
a= 10
a= 20
sum
a= 30

Example:2
overloading operator “-=”.

// to overload -=
// add two objects using "-=" operator
//without friend function

#include<iostream>
#include<conio.h>
using namespace std;
class sample
{
     int a;
public:
     sample();
     sample(int n);
     void get();
     void disp();
     void operator-=(sample s);
};
sample::sample()
{
     a=0;
}
sample::sample(int n)
{
     a=n;
}
void sample::get()
{
     cout<<"Enter the value of a ";
     cin>>a;
}
void sample::disp()
{
     cout<<"a= "<<a<<endl;
}
void  sample::operator-=(sample s)
{
     a-=s.a;
}
int main()
{
     sample s1,s2;
     s1.get();s2.get();
     s1.disp();s2.disp();
     //-=
     cout<<"Difference"<<endl;
     s2-=s1;//s2.operator-=(s1);
     s2.disp();
     getch();
     return(0);
}

Output:

Enter the value of a 25
Enter the value of a 6
a= 25
a= 6
sum
a= -19

Example:3
overloading operator “*=”.

// to overload *=
// add two objects using "*=" operator
//without friend function

#include<iostream>
#include<conio.h>
using namespace std;
class sample
{
     int a;
public:
     sample();
     sample(int n);
     void get();
     void disp();
     void operator*=(sample s);
};
sample::sample()
{
     a=0;
}
sample::sample(int n)
{
     a=n;
}
void sample::get()
{
     cout<<"Enter the value of a ";
     cin>>a;
}
void sample::disp()
{
     cout<<"a= "<<a<<endl;
}
void  sample::operator*=(sample s)
{
     a*=s.a;
}
int main()
{
     sample s1,s2;
     s1.get();s2.get();
     s1.disp();s2.disp();
     //*=
     cout<<"Product"<<endl;
     s2*=s1;//s2.operator*=(s1);
     s2.disp();
     getch();
     return(0);
}

Output:

Enter the value of a 10
Enter the value of a 25
a= 10
a= 25
Product
a= 250