MEMBER FUNCTIONS IN CLASSES
Member functions are the functions, which have their declaration inside the class definition and works on the data members of the class. The definition of member functions can be inside or outside the definition of class.
Member functions are the functions, which
have their declaration inside the class definition and works on the data
members of the class. The definition of member functions can be inside or
outside the definition of class.
If the member function is defined inside
the class definition it can be defined directly, but if its defined outside the
class, then we have to use the scope resolution
:: operator
along with class name alng with function name.
Example :
class Cube
{ public:
int side;
int
getVolume(); // Declaring function
getVolume with no argument and return type int.
};
If we define the function inside class
then we don't not need to declare it first, we can directly define the function.
class Cube{
public:
int side;
int getVolume()
{ return side*side*side; //returns volume of cube
}
};
But if we plan to define the member
function outside the class definition then we must declare the function inside
class definition and then define it outside.
class Cube
{ public:
int side;
int getVolume();
}
int Cube :: getVolume()
// defined outside class definition
{
return
side*side*side;
}
The maine function for both the function
definition will be same. Inside main() we will create object of class, and will
call the member function using dot (
.) operator.
int main()
{
Cube C1;
C1.side=4;
// setting side value
cout<< "Volume of cube C1
="<< C1.getVolume();
}
Similarly we can define the getter and
setter functions to access private data members, inside or outside the class
definition.
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