Declaring friend function with inline code

OBJECT ORIENTED PROGRAMMINGS (C++) 2010

Program No 01) Write a program using friend
function.

1
Page

RAJEEV SHARAN ROLL NO-23 APPAREL PRODUCTION (08-12)/SEM-04/DFT/NIFT BANGALORE


//Declaring friend function with inline code

#include<iostream.h>

#include<conio.h>

class sample

{ private:

int x;

public:

inline void getdata();

friend void display(class sample);

};

inline void sample :: getdata()

{ cout<<" Enter a value for x n";

cin>>x;

}

inline void display(class sample abc)

{ cout<<" Entered number is : "<<abc.x;

cout<<endl;

}

void main()

{ clrscr();

sample obj;

obj.getdata();
2

cout<<" Accessing the private data by non-member";
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cout<<" Function n";

display(obj);

getch();

}

OUTPUT

Enter a value for x

75

Accessing the private data by non-member Function

Entered number is : 75

3
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Program No 02) Write a program to store
information about students using file handling
operations. 4
Page



// array of nested class objects using file operations

#include<fstream.h>

#include<string.h>

#include<iomanip.h>

#include<conio.h>

const int max=100;

class student_info

{ private:

char name[20];

long int rollno;

char sex;

public:

void getdata();

void display();

class date

{ private:

int day, month, year;

public:

void getdate();

void show_date();

class age_class

{ private:
5

int age;
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public:

void getage();

void show_age();

}; // end of age class declaration

}; // end of date class declaration

}; // end of student_info class declaration

void student_info:: getdata()

{ cout<<" enter a name : t";

cin>>name;

cout<<endl;

cout<<" roll no : t";

cin>>rollno;

cout<<endl;

cout<<" sex : t";

cin>>sex;

cout<<endl;

}

void student_info::date::getdate()

{ cout<<" enter a date of birth"<<endl;

cout<<" day : ";

cin>>day;

cout<<" month : ";
6

cin>>month;
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cout<<" year : ";

cin>>year;

}

void student_info :: date :: age_class :: getage()

{ cout<<" enter an age : ";

cin>>age;

}

void student_info::display()

{ cout<<name<<" ";

cout<<rollno<<" ";

cout<<sex<<" ";

}

void student_info:: date :: show_date()

{cout<<day<<"/"<<month<<"/"<<year;

}

void student_info :: date :: age_class :: show_age()

{ cout<<"t"<<age<<endl;

}

void main()

{ clrscr();

student_info obj1[max];

student_info :: date obj2[max];
7

student_info :: date :: age_class obj3[max];
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int n, i;

fstream infile;

char fname[10];

cout<<" enter a file name to be stored?n";

cin>>fname;

infile.open(fname, ios::in ||ios::out ||ios::app );

cout<<" how many students?n";

cin>>n;

//reading from the keyboard

cout<<" enter the following information n";

for(i=0; i<=n-1; ++i)

{ int j=i+1;

cout<<" n object : "<<j<<endl;

obj1[i].getdata();

obj2[i].getdate();

obj3[i].getage();

}

// storing onto the file

infile.open(fname, ios::out);

cout<<" storing onto the file................n";

for(i=0; i<=n-1; ++i)

{ infile.write ((char*) &obj1[i], sizeof(obj1[i]));
8

infile.write ((char*) &obj2[i], sizeof(obj2[i]));
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infile.write ((char*) &obj3[i], sizeof(obj3[i]));

}

infile.close();

// reading from the file

infile.open(fname, ios::in);

cout<<" reading from the file................n";

cout<<"nnn"<<endl;

cout<<" contents of the array of nested classes n";

cout<<"_________________________________________________________"
<<endl;

cout<<" name roll no sex date of birth age n";

cout<<"_________________________________________________________
"<<endl;

for(i=0; i<=n-1; ++i)

{ infile.read ((char*) &obj1[i], sizeof(obj1[i]));

infile.read ((char*) &obj2[i], sizeof(obj2[i]));

infile.read ((char*) &obj3[i], sizeof(obj3[i]));

obj1[i].display();

obj2[i].show_date();

obj3[i].show_age();

}

cout<<"_________________________________________________________
9

"<<endl;
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infile.close();

getch();

}

OUTPUT

enter a file name to be stored?

AP

how many students?

3

enter the following information

object : 1

enter a name :

Abhishek

roll no : 1

sex : M

enter a date of birth

day :16

month : 6

year: 1989

enter an age : 20

object : 2

enter a name :
10

Abhishek
Page

roll no : 2



sex : M


day :7

month : 2

year: 1989

enter an age : 21

object : 3

enter a name :

Adarsh

roll no : 3

sex : M


day :26

month : 6

year: 1989

enter an age : 20

storing onto the file..................................

reading from the file............................
11
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contents of the array of nested classes

name roll no sex date of birth age

Abhishek 1 M 16/6/1989 20

Abhishek 2 M 7/2/1989 21

Adarsh 3 M 24/6/1989 20

__________________________________________________________________________

12
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Program no 03) Write a program of multiple level
inheritances.

13
Page



//program using multiple level of inheritance


#include<conio.h>

#include<stdio.h>

#include<string.h>

#include<iomanip.h>

const int max=100;

class basic_info

{

private: char name[30];

long int rollno;

char sex;

public: void getdata();

void display();

}; //end of class declaration

class academic_fit:private basic_info

{ private: char course[20];

char semester[10];

int rank;


void display();

};
14

class physical_fit:private academic_fit
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{ private: float height, weight;


void display();

};

class financial_assist: private physical_fit

{ private: float amount;


void display();

};

void basic_info::getdata()

{

cout<<"ENTER A NAME ? n";

cin>>name;

cout<<"ROLL No. ? n";

cin>>rollno;

cout<<"SEX ? n";

cin>>sex;

}

void basic_info::display()

{

cout<<name<<"t";

cout<<rollno<<"t";
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cout<<sex<<"t";
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}

void academic_fit::getdata()

{basic_info::getdata();

cout<<"COURSE-NAME (BFTECH/MFTECH/BFDES/MFM/MFDES)?n";

cin>>course;

cout<<"SEMESTER (First/Second etc.)?n";

cin>>semester;

cout<<"RANK OF THE STUDENT?n";

cin>>rank;

}

void academic_fit::display()

{ basic_info::display();

cout<<course<<"t";

cout<<semester<<"t";

cout<<rank<<"t";

}

void physical_fit::getdata()

{ academic_fit::getdata()

cout<<"ENTER height?n";

cin>>height;

cout<<"WEIGHT?";

cin>>weight;
16

}
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void physical_fit::display()

{ academic_fit::display()

cout<<height<<"t";

cout<<weight<<"t";

}

void financial_assist::getdata()

{physical_fit::getdata();

cout<<"AMOUNT IN RUPEESn";

cin>>amount;

}

void financial_assist::display()

{physical_fit::display();

cout<<setprecision(2);

cout<<amount<<"t";

}

void main()

{ clrscr();

financial_assist f[max];

int n;

cout<<"HOW MANY STUDENTS?n";

cin>>n;

cout<<"ENTER THE FOLLOWING INFORMATION FOR FINANCIAL
17

ASSISTANCEn";
Page

for(int i=0; i<=n-1; ++i)



{cout<<"RECORD NO. "<<i+1<<endl;

f[i].getdata();

cout<<endl;

}

clrscr() ;

cout<<endl;

cout<<"ACADEMIC PERFORMANCE FOR FINANCIAL
ASSISTANCEn";

cout<<"_________________________________________________________
_____________________n";

cout<<"NAME ROLLNO SEX COURSE SEMESTER RANK
HEIGHT WEIGHT AMOUNT n";

cout<<"_________________________________________________________
_____________________n";

for(i=0; i<=n-1; ++i)

{

f[i].display();

cout<<endl;

}

cout<<endl;

cout<<"_________________________________________________________
______________________n";

getch();
18
Page

}



OUTPUT

HOW MANY STUDENTS?
3
ENTER THE FOLLOWING INFORMATION
RECORD: 1
ENTER A NAME?
Sarvesh
ROLL No. ?
13
SEX?
M
COURSE?
BFTECH
SEMESTER?
Fourth
RANK?
1
HEIGHT?
174
WEIGHT?
59
AMOUNT IN RUPEES?
60000
RECORD : 2
ENTER A NAME?
Prashant
ROLL No. ?
19
SEX ?
M
COURSE?
BFTECH
SEMESTER?
Fourth
RANK?
3
HEIGHT?
166
WEIGHT?
63
AMOUNT IN RUPEES?
40000
RECORD : 3
19

ENTER A NAME ?
Rajeev
Page

ROLL No. ?



23
SEX ?
M
COURSE?
BFTECH
SEMESTER?
Fourth
RANK?
15
HEIGHT?
164
WEIGHT?
53
AMOUNT IN RUPEES?
80000

ACADEMIC PERFORMANCE FOR FINANCIAL ASSISTANCE
___________________________________________________________________________
NAME ROLLNO SEX COURSE SEMESTER RANK HEIGHT WEIGHT AMOUNT
___________________________________________________________________________
Sarvesh 13 M BFTECH Fourth 1 174 59 60000

Prashant 19 M BFTECH Fourth 3 166 63 4 0000

Rajeev 23 M BFTECH Fourth 15 164 53 80000

__________________________________________________________________________________________

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Program No 04) Write a program using virtual
functions.

21
Page



// virtual functions

#include<conio.h>
#include<stdio.h>
#include<string.h>
class baseA
{
public: int a;
virtual void getdata()
{cout<<"enter the value for A:"<<endl;
cin>>a;
}
virtual void display()
{
cout<<"the value of a in base class A:t"<<a;
cout<<endl;
}
};
class baseB:public baseA
{
public: int a;
{cout<<"enter the value for B:"<<endl;
cin>>a;
}
{
cout<<"the value of a in base class B:t"<<a;
cout<<endl;
}
};
class baseC:public baseB
{
public: int a;
{cout<<"enter the value for C:"<<endl;
cin>>a;
}
{
22

cout<<"the value of a in base class C:t"<<a;
Page

cout<<endl;



}
};
class derivedD: public baseC
{
private:
float x;
public:
derivedD()
{ x=12.03;
}
{cout<<"enter the value for D:"<<endl;
cin>>a;
}
{
cout<<"the value of a in derived class D:t"<<a;
cout<<endl;
cout<<"The value of float constant in derived class D;t"<<x<<endl;
}
};
void main()
{
clrscr();
derivedD objd;
baseA obja;
baseB objb;
baseC objc;
baseA *ptr[4];
ptr[0]=&obja;
ptr[1]=&objb;
ptr[2]=&objc;
ptr[3]=&objd;
for(int i=0;i<4;i++)
{ ptr[i]->getdata();
cout<<endl;
}
for(int j=0;j<4;j++)
{ ptr[j]->display();
cout<<endl;
}
23

getch();
Page

}



OUTPUT

enter the value for A:
65
enter the value for B:
78
enter the value for C:
45
enter the value for D:
89
the value of a in base class A: 65
the value of a in base class B: 78
the value of a in base class C: 45
the value of a in derived class D: 89
The value of float constant in derived class D: 12.03

24
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Program no 05) Write a program of exception
handling

25
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26
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Declaring friend function with inline code

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