What is Operator Overloading? !!!

What is Operator Overloading? How to use operator overloading in C++
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C++ lets you build operators that implement unary and binary operations on objects o classes. This is called as Operator overloading. You can write a function to make the operator do your custom operation. For example:

cpp code

Date dt1( 1,2, 2004);
Date dt2( 2,4, 2005);
Dt1+=100;
Int diff = dt2-dt1;

Here, the plus operator and the subtract operator have been overloaded to perform custom operations for the Date class.

Another example in class definition:
cpp code

class NewNumberType
{
      double real,
             imag;
public:
      NewNumberType( double real = 0., double imag = 0.);  
      NewNumberType operator+(const NewNumberType&) const;        
};

 
NewNumberType::NewNumberType( double r, double i )
{
      real = r; imag = i;
}

//  Overloading + (plus) operator
NewNumberType NewNumberType::operator+ (const NewNumberType& c) const
{
      NewNumberType result;
      result.real = (this->real + c.real);
      result.imag = (this->imag + c.imag);
      return result;
}

int main()
{
      NewNumberType x(4,4);
      NewNumberType y(6,6);
      NewNumberType z = x + y;  
}

updated.