Funtion over loading is yet another feature of polymorphism.Diff functions with the same function name but diff arguments are defined in a class.During compile time the appropriate function is called dep on the arguments passed.Eg:

class area

{

int sq l b;

float r;

public:

draw()

{cout<< no shape };

float draw(float );

int draw(int );

int draw(int int );

};

float shape:: draw(float cir)

{

r cir;

return(3.14*r*r);

};

int shape::draw(int sq)

{

return(sq*sq);

};

int shape::draw(int l int b)

{

l (a+b);

return(2*l);

};

so dep on the arg passed we get the area of circle square or rectangle.

in overloading we use same function in somany types.

in function overloading the function has single name but when it called from main function by passing different types of agruments then it behaves accroding to the passed from the function.

the function different actions based on arguments hence it's called as function overloading.

the need is that

1. rewriting of the code is not required

2. memory is saved.

c++ is object oriented and constructors create objects frojm dust to create objects in different ways we provide constructors with diff arguments some time without arguments ..thus function overloading is must..AS SIMPLE AS THAT