static data member and member function .pptx

S.DHAKSHANAMOORTHY
S.SARAVANAN
M.VISHALVENKAT
N.DINESHKUMAR
K.R.SHAARUKESH

CONTENTS
Static Data Member
Static Member Function
Example - Program

STATIC DATA MEMBERS
• We can define class members static using static keyword.
• A static member variable has certain special characteristics:
i. Shared by all objects of the class.
ii. Initialized to zero when the first object is created.
iii. Initialized outside the class.

EXAMPLE
//Static Member
#include <iostream>
using namespace std;
class Student {
public:
static int total;
Student() { total += 1; }
};
int Student::total = 0;
int main()
{
Student s1;
cout << "Number of students:" << s1.total << endl;
Student s2;
Student s3;
return 0;
}

STATIC MEMBER FUNCTIONS
• A static function can access only other static
members.
• It is called using class name and scope resolution
operator.
class name :: function name;
• It can not use this pointer.

EXAMPLE
//Static Member
//Static Function
#include <iostream.h>
#include <conio.h>
class test
{
int code;
static int count;
public:
void set(void)
{
code=++count;
}
void show(void)
{
cout<<"Object number:"<<code<<endl;
}
static void showcount(void)
{
cout<<"Count:"<<count<<endl;
}
};

//Initializing Static Member
//Accessing Static Function
int test::count;
void main()
{
test t1,t2,t3;
clrscr();
t1.set();
test::showcount();
t2.set();
test::showcount();
t3.set();
test::showcount();
t1.show();
t2.show();
t3.show();
getch();
}

EXAMPLE
#include <iostream>
using namespace std;
class Box
{
private:
static int length;
static int breadth;
static int height;
public:
static void print()
{
cout << "The value of the length is: " << length << endl;
cout << "The value of the breadth is: " << breadth << endl;
cout << "The value of the height is: " << height << endl;
}
};
int Box :: length = 10;
int Box :: breadth = 20;
int Box :: height = 30;

int main()
{
Box b;
cout << "Static member function is called through Object name: n" <<
endl;
b.print();
cout << "nStatic member function is called through Class name: n" <<
endl;
Box::print();
return 0;
}

static data member and member function .pptx

static data member and member function .pptx

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