Member Functions

MEMBER FUNCTIONS

Defining member functions

Data members of a class must be declared within the body of the class. Member functions can be defined in Two ways:

Inside the class Outside the class

^§    Member functions inside the class body:

^§    This is similar to a normal function definition expect that it is enclosed within the body of a class.

^§    These are considered as inline by default.

^§    In some implementations member function a having loops like for, do, while etc. are not treated as inline function.

#include<iostream.h>

Class date

{

private: int day;

int month;

int year;

public: void set(int d, int m, int y)

{

day = d;

month= m; year = y;

}

void show()

{                               cout<<    day<<“-”    month<<“-”         year<<endl;                     }

};

void main()

{

Date d1, d2;

// creating two objects D1.set(15,8,2011); d2,.set(26,1,2011);

Cout<<“ independence day”;

D1.show();

Cout<<“ republic day”;

D2.show();

}

Inline is actually just a request, not a command, to the compiler. The compiler can choose to ignore it.

Also, some compilers may not inline all types of functions.

For example, it is common for a compiler not to inline a recursive function. Inline functions may be class member functions.

For example, this is a perfectly valid C++ program

#include <iostream>

class myclass

{

int a, b; public:

void init(int i, int j);

void show();

};

// Create an inline function.

inline void myclass::init(int i, int j)

{

a = i; b = j;

}

// Create another inline function. inline void myclass::show()

{

cout << a << " " << b << "\n";

}

int main()

{

myclass x; x.init(10, 20); x.show(); return 0;

}