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Class & Object

In side of class we define the member function definitions they are two type s to declare the class &object.

          · Inside of class
     ·    Outside of class

Fig: Class & Object In C++

Definition of member function

Member functions of a class can be defined either outside the class definition or inside the class definition. In both the cases, the function body remains the same.

1.   Inside the Class: 

A member function of a class can also be defined inside the class. when a member function is defined inside the class, the class name and the scope resolution operator are not specified in the function header. The member functions defined inside a class definition are by default inline functions.

Syntax:

class MCA

{

private:

int a,b;

public:

void getdata();

void display()

{

cout<<a<<b;

}

};

2.   Outside the Class: 

Defining a member function outside a class requires the function declaration (function prototype) to be provided inside the class definition. The member function is declared inside the class like a normal function. This declaration informs the compiler that the function is a member of the class and that it has been defined outside the class. After a member function is declared inside the class, it must be defined (outside the class) in the program.

Syntax:

class MCA

{

private:

int a,b;

void getdata()

};

void MCA :: getdata()

{

cout<<”input two no”;

cin>>a>>b;

}

Program:

#include<iostream.h>

#include<conio.h>

class MCA

{

private:

int a,b,c,d;

public:

void getdata();

void display() //inside class

{

cout<<”d=”<<d;

}

};

void MCA :: getdata() //outside class

cout<<”input three value”;

cin>>a>>b>>c;

d=a*b*c;

}

void main()

{

MCA  x;

x.getdata();

x.getdisplay();

getch();

}

Output:

Input three value:

4

4

5

d=80