Object as function argument , friend and static function by shahzad younas

2) Friend Function
1) Object as Function Argument
3) Static Function
By Shahzad Younas
Superior University Depalpur
E-Mail: shzadyounas@gmail.com

Group Leader M.Shahzad Roll# 15
Group Member Fiaz Tabish Roll# 40
Group Member Ali Shahzad Roll# 28

1) Object as Function Argument
3) Static Function
2) Friend Function
Present by
M.Shahzad
Present by Fiaz
Tabish
Present by Ali
Shahzad

Review
Defining Member Function Outside
Class The member function of a class can also be
defined outside the class
 The resolution Operator :: is used in function
declarator if the function is defined outside the
class
Syntax:
Return_type class_name ::
function_name(Parameters)

Defining Member
Function in Class
class test
{
public:
void disp()
{
cout<<“Show”;
}
};
Defining Member
Function Outside Class
class test
{
public:
void disp();
};
void test :: disp()
{
cout<<“Show”;
}

Object as Function Argument
Object pass as parameters to
member function.
Same method as passing simple
variables.

Class test
{
Public:
Void disp(test);
}
Void test :: disp(test t)
{
……….;
……….;
}
Simple Example

#include<iostream.h>
#include<conio.h>
class time
{
private:
int h, m;
public:
void gettime()
{
cout<<"Enter Time
in Hours:" ;
cin>>h;
cout<<"Enter Time
in Mints:";
cin>>m;
}
void show()
{
cout<<"Hours is:"<<h<<endl;
cout<<"Mints is:"<<m<<endl;
}
void tshow()
{
cout<<"total Hours="<<h<<“ Minets=“;
cout<<m;
}
void sum(time,time);
};

void time::sum(time t1,time
t2)
{
m=t1.m+t2.m;
h=m/60;
m=m%60;
h=h+t1.h+t2.h;
}
void main()
{
time t,t1,t2;
t1.gettime();
t2.gettime();
t.sum(t1,t2);
t1.show();
t2.show();
t.tshow();
getch();
}
Program Continue . . . .

Who is a Friend ????????
A friend is one who has access to all
your “PRIVATE” stuff.

Friend Function
 Has access to all the private and
protected members of class
 A non member function
 Definition part should be kept outside
the class body, as it is not a member
function of the class.

class BSCS
{
Private:
int roll;
public:
void disp(void);
};
class MCS
{
Private:
int roll;
public:
void disp(void);
};
frien
d
frien
d
Void disp(void)
{
……….;
……….;
}

Rules for Friend Function
 Scope resolution :: not used
 Call as simple function as
exp: disp();
 Void disp(BSCS a, MCS b)
Objects of class

#include<conio.h>
class A; // Forward Decleration
class B
{
private:
int b;
public:
void getval(int x)
{
b=x;
}
void showval(void)
{
cout<<"Value of b:"<<b<<endl;
}
friend void add(A,B);
};
class A
{
private:
int a;
public:
void getval(int x)
{
a=x;
}
void showval(void)
{
cout<<"Value of A:"<<a<<endl;
}
friend void add(A,B);
};

void add (A obj1, B obj2)
{
cout<<"Addition of A and B:"<<obj1.a+obj2.b;
}
void main()
{
A a;
B b;
clrscr();
a.getval(100);
b.getval(200);
a.showval();
b.showval();
add(a,b);
getch();
}
Program Continue . . . .

Static Functions
 A type of member function that can be
accessed without any object of class
is called static Function.

Class test
{
Static void dis(void);
};
Test::dis()
Simple Example

#include<conio.h>
class Test
{
private:
static int n;
public:
static void show()
{
cout<<"n="<<n<<endl;
}
};
int Test :: n=10;
void main()
{
clrscr();
Test::show();
getch();
}

Object as function argument , friend and static function by shahzad younas

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