Member Functions defined outside the class in C++ program

In our previous examples we have defined all functions within the class body. C++ program allows defining functions outside the body of classes also. In such case we have to declare the functions within the class body.

Here is a C++ program to demonstratethe above feature.

#include< iostream.h>

#include< conio.h>

class Rect

{

private:

int len, br;

public:

void getData ();

void setData (int l, int b);

void displayData ();

void area ();

Rect (int a, int b);

Rect ();

};

void Rect::getData ()

{

cout<< endl<< "Enter Length and Breadth: -";

cin >>len >>br;

}

void Rect::setData (int l, int b)

{

len=l;

br=b;

}

void Rect::displayData ()

{

cout<< endl<< "Length="<< len;

cout<< endl<< "Breadth="<< br;

}

void Rect::area ()

{

int a, p;

a=len*br;

p=2*(len+br);

cout<< endl<< "Area="<< a;

cout<< endl<< "Perimeter="<< p;

}

Rect::Rect ()

{

}

Rect::Rect (int a, int b)

{

len=a;

br=b;

}

void main ()

{

clrscr ();

Rect r1 (2,3), r2, r3;

cout<< endl<< "For object number 1: -";

r1.displayData ();

r1.area ();

cout<< endl<< "For object number 2: -";

r2.setData (3,5);

r2.displayData ();

r2.area ();

cout<< endl<< "For object number 3: -";

r3.getData ();

r3.displayData ();

r3.area ();

getch ();

}