an example of operator overloading:

Say you want to add 2 complex numbers (in mathematics, a complex number is a number with 2 parts, a real and an imaginary, written like (1,2i) with the first number being the real number and the second being the imaginary.) Say you want to add 2 of these complex numbers (added as ((xr + yr), (xi + yi)i).) In C, you would probably devise a structure something like this to hold the data:

struct complex
double real;
double imag;

And you would add these two structs something like this, needing to devise a function that adds complex numbers and returns the sum:

added = addComplex(a, b);

But wouldn't it make more sense to be able to do it like this?

added = a + b;

Well, with operator overloading you can. Devise your class like this:

class complex
double real;
double imag;
complex operator+(complex &);

You will, of course, need to define your class constructor (complex()) and your destructor (~complex()). Then, you tell the compiler how to overload the addition operator to add two of these classes together:

compex complex::operator+(comlex & cnum)
complex temp; // new temporary class

temp.real = real + cnum.real;
temp.imag = imag + cnum.imag;
return temp;

This enables the compiler to know how to add two of the same classes together. You can use any standard operator for C++ overloading.

Another cool feature of operator overloading is the ability to kind-of re-write the istream and ostream classes (those are the classes in C++ that deal with input/output, roughly equivalent to stdio.h in C) to be able to tell cout (basically printf()) to print the class merely by passing the class to the ostream.

I am not very good at explaining things, but I hope I have demonstrated to you the basics of C++ operator overloading.