C++ classes with static members, methods with default arguments and friend functions

 

Implementation of Static members, Default arguments and Friend functions

Aim

        To design a C++ classes with static members, methods with default arguments and friend functions.

Algorithm

Default arguments:

Step 1: Start the Program Execution

Step 2:Create the Classes  and declare all the Variables and Member functions.

Step 3: Function may be defined to take default values for the omitted arguments

           by providing the default values in the function prototype.

Step 4: Declare the default function.

Step 5: Invoke the default function.

Step 6: Display the result

Step 7:Stop the Program Execution.

Static Member Functions:

Step 1: Start the Program Execution

Step 2: Create the Classes and declare all the Variables and Member functions.

Step 3: Static member function of class is shared by all the instances of the class. A static                 

             member functions cannot access auto members of a class.

Step 4: Create class TEST with static member function.

Step 5: Invoke the static member function using class name with scope

            Resolution operator and function name.

Step 6: Display the value

Step 7: Stop the Program Execution.

Static Data members:

Step 1: Start the Program Execution

Step 2: Create the Classes and declare all the Variables and Member functions.

Step 3: Static data member of class is shared by all the instances of the class.

Step 4: Create class ITEM with static data member as count.

Step 5: Create a member function to increment the count.

Step 6: Declare the static data member using scope resolution operator.

Step 7: Display the count value.

Step 8: Stop the Program Execution.

Friend functions:

Step 1: Start the Program Execution

Step 2: Create the Classes and declare all the Variables and Member functions.

Step 3: Friend function is used to access the private data member and member

             Function.

Step 4: Create the class and declare the data member as private.

Step 5: Declare the friend function using the keyword friend.

Step 6: Perform the operation

Step 7: Display the result.

Step 8: Stop the Program Execution.

 

Program:

Default arguments:

Static Data members:

#include<iostream.h>

class item

{

static int count;

int num;

public:

void getdata(int a)

{

num=a;

count++;

cout<<”Number”<<num;

}

void showcount()

{

cout<<”count”;

cout<<count<<”\n”;

}

};

int item::count;

int main()

{

item a,b,c;

a.showcount();

b.showcount();

c.showcount();

a.getdata(20);

b.getdata(30);

c.getdata(40);

a.showcount();

b.showcount();

c.showcount();

}

OUTPUT:

count 0

count 0

count 0

Number 20

Number 30

Number 40

count 3

count 3

count 3

Static Member Functions:

#include

class test

{

int code;

static int count;

public:

void setcode()

{

cout<<”Object Number:”<<code<<”\n”;

}

};

int test::count;

int main()

{

test t1,t2;

t1.setcount();

t2.setcount();

test::showcount();

test t3;

t1.showcode();

t2.showcode();

t3.showcode();

return(0);

}

OUTPUT:

count 2

count 3

Object Number 1

Object Number 2

Object Number 3

Friend functions:

Posted in: C / C++ Program