OOP in C++ (Object Oriented Programming). Here you will find OOP programs that are very important and very easy.
Program 1:
#include<iostream>
using namespace std;
class Test //create class by using name ‘Test’ along with class
keyword
{
private:
int x; //private data member
float y; //private data member
protected:
public:
int z; //public data member
void setX() //member
function to set data
{
cin>>x; //assigning value to 'x'
}
void
setY() //member
function to set data
{
cin>>y; //assigning value to 'y'
}
void getX() //member
function to get data
{
cout<<x; //displaying value of 'x'
}
void
getY() //member
function to get data
{
cout<<y; //displaying value of 'y'
}
};
int
main() //main function
{
Test obj; //object declaration
obj.x=10; //private data member
obj.y=20; //private data member
obj.z=30; //public data member
obj.setX(); //public data member
obj.setY(); //public member function
obj.getX(); //public member function
obj.getY(); //public member function
cout<<obj.z; //public data
member
return 0;
}
Program 2:
#include
<iostream>
using namespace
std;
class Box //create class by using name ‘Box’ along
with class keyword
{
private:
int length; //
Length of a box
int breadth; //
Breadth of a box
public:
int
height; //
Height of a box
void setData(int l, int
b,int h) //member function to set data
{
length=l;
breadth=b;
height=h;
}
int
getLength() //member
function to get data
{return length;}
int
getBreadth() //member function to get data
{return breadth;}
};
int main( ) //main function
{
Box
b1;
//setting length, breadth and height
b1.setData(10,6,5);
//accessing private members using member
functions
cout<<"Length
of Box: "<<b1.getLength()<<endl;
cout<<"Breadth of Box:
"<<b1.getBreadth()<<endl;
//accessing public member height using (.)
operator
cout<<"Height
of Box: "<<b1.height<<endl;
return 0;
}
Program 3:
Write a program that will display the
result card of a student: a result card will contain marks of five subjects and
display the CGPA of the student in the first semester.
#include <iostream>
using namespace std;
class student //create class by using
name ‘student’ along with class keyword
{
private: //private access specifier
int l; //private data member
public: //public access specifier
void
calculateCGPA() //member function
to calculate CGPA
{
cout<<"-------------- CGPA
Calculating -----------------"<<endl;
cout<<"How many semester
results do you want input :";
cin>>l; //assigning value to ‘l’
cout<<endl;
float
sems[l];
for(int
i=1;i<=l;i++) //using for loop
{
cout<<" Enter Semester
"<<i<<" Result(GPA): ";
cin>>sems[i];
cout<<endl;
}
float sem_total=0;
for(int j=1;j<=l;j++) //using
for loop
{
sem_total=sem_total+sems[j];
}
cout<<"*** Your CGPA is
"<<sem_total/l<<" *****"<<endl;
}
}; //we must use semicolon at the end of class.
int main() //main
function
{
student result;
result.calculateCGPA();
return 0;
}
Program 4:
#include
<iostream>
using namespace
std;
class
Student //create class by using
name ‘student’ along with class keyword
{
private: //private access
specifier
char name[10]; //private data members
int roll_No; //private data members
int m1, m2, m3; //private data members
int total, average; //private data members
protected: //protected access
specifier
public: //public access
specifier
void set_Data() //member function to set data
{
cout<<"Enter
student name::";
cin>>name;
cout<<"Enter
roll no of the student::";
cin>>roll_No;
cout<<"Enter
marks of first subject::";
cin>>m1;
cout<<"Enter
marks of second subject::";
cin>>m2;
cout<<"Enter
marks of third subject::";
cin>>m3;
}
void get_Average() //member
function to get data
{
cout<<"student
name::”<< name <<endl;
cout<<"roll
no::"<< roll_No<<endl;
cout<<"marks
of first subject::” <<
m1<<endl;
cout<<"marks
of second subject:: "<< m2<<endl;
cout<<"marks of third subject:: "<< m3<<endl;
total=m1+m2+m3;
average=total/3;
cout<< "Average marks of "
<<name<< " will be "<<average;
}
}; //we must use semicolon
at the end of class.
int main() //main function
{
Student S1, S2, S3;
S1.set_Data();
S1.get_Average();
S2.set_Data();
S2.get_Average();
S3.set_Data();
S3.get_Average();
}
Program 5 :
Write a program that declares a class
with one integer data member and two member function in() and out() to input
and output data in the data member.
#include <iostream>
using namespace std;
class
Test //create class by using
name ‘Test’ along with class keyword
{
private: //private access specifier
int n; //private data member
public: //public access specifier
void
in() //member
function to input data
{
cout<<"Enter a
number:";
cin>>n;
}
void out() //member
function to receive or display data
{
Cout<<"The value
of n = "<<n;
}
}; //we
must use semicolon at the end of class.
int main() //main
function
{
Test obj; //object
declaration
obj.in();
obj.out();
return 0;
}
Program 6:
Write a class Marks with three data
members to store three marks. Write three member functions in() to input marks,
sum() to calculate and return the sum, avg() to calculate and return the
average marks.
#include <iostream>
using namespace std;
class
Marks //create class by using
name ‘Marks’ along with class keyword
{
private: //private access specifier
int a,b,c; //private data members
public: //public access specifier
void
in() //member function to input data
{
cout<<"Enter three
marks: ";
cin>>a>>b>>c;
}
int
sum() //member function to get sum
{
return a+b+c;
}
float
avg() //member function to get avg
{
return (a+b+c)/3;
}
}; //we
must use semicolon at the end of class.
int main() //main
function
{
Marks m; //object
declaration
int s;
float a;
m.in();
s = m.sum();
a = m.avg();
cout<<"Sum =
"<<s<<endl;
cout<<"Average =
"<<a;
return 0;
}
Program 7:
Write a class circle with one data
member radius. Write three member function get_radius() to set radius value
with parameter value, area() to display radius and circum() to calculate and
display the circumference of circle.
#include <iostream>
using namespace std;
class
circle //create class by using name ‘circle’ along
with class keyword
{
private: //private access specifier
float radius; //private data member
public: //public access specifier
void get_radius(float
r) //member
function to get radius
{
radius = r;
}
void
area() //member function to calculate area
{
cout<<"Area of
circle "<<3.14*radius*radius<<endl;
}
void
circum() //member
function to calculate circumference
{
cout<<"Circumference
of circle "<<2*3.14*radius;
}
}; //we must use semicolon at the end of class.
int main() //main function
{
circle c; //object
declaration
float rad;
cout<<"Enter radius ";
cin>>rad;
c.get_radius(rad);
c.area();
c.circum();
return 0;
}
Program 8:
#include <iostream>
using namespace std;
class
Book //create class by using
name ‘Book’ along with class keyword
{
private: //private access specifier
int BookID, Pages; //private data member
float Price; //private
data member
public: //public access specifier
void
get() //member function to get data
{
cout<<"Enter Book
ID:";
cin>>BookID;
cout<<"Enter
Pages:";
cin>>Pages;
cout<<"Enter
price:";
cin>>Price;
}
void
show() //member function to show data
{
cout<<"BookID =
"<<BookID<<endl;
cout<<"Pages =
"<<Pages<<endl;
cout<<"Price =
"<<Price<<endl;
}
void set(int
id,int pg, float pr) //member function to set data
{
BookID = id;
Pages = pg;
Price = pr;
}
float
getPrice()
//member function to get price
{
return Price;
}
}; //we must use semicolon at the end of class.
int
main() //main
function
{
Book b1, b2; //object
declaration
b1.get();
b2.set(2, 320, 150.75);
cout<<"\nThe detail of most
costly book is as follows:"<<endl;
if(b1.getPrice()>b2.getPrice())
b1.show();
else
b2.show();
return 0;
}
Program 9:
#include <iostream>
using namespace std;
class
Result //create class by using
name ‘Result’ along with class keyword
{
private: //private access specifier
int rno, marks[3]; //private
data member
char name[50]; //private
data member
public: //public access specifier
void
input() //member function to input data
{
cout<<"Enter Roll
No:";
cin>>rno;
cout<<"Enter
name:";
gets(name);
for(int i=0; i<3; i++)
{
cout<<"Enter
marks ["<<i<<"]:";
cin>>marks[i];
}
}
void
show() //member function to show data
{
cout<<"Roll No =
"<<rno<<endl;
cout<<"Name =
"<<name<<endl;
for(int i=0; i<3; i++)
cout<<"Marks["<<i<<"]:"<<marks[i]<<endl;
}
int
total() //member function to get total
{
int t=0;
for(int i=0; i<3; i++)
t=t+marks[i];
return t;
}
float avg() //member function to calculate avg
{
int t=0;
for(int i=0; i<3; i++)
t=t+marks[i];
return t/3.0;
}
}; //we must use semicolon at the end of class.
int main()
{
Result r;
r.input();
r.show();
cout<<"\nTotal marks
="<<r.total()<<endl;
cout<<"Average marks
="<<r.avg()<<endl;
return 0;
}
Program 10:
#include <iostream>
using namespace std;
class
student //create class
by using name ‘student’ along with class keyword
{
private: //private
access specifier
char name[20]; //private
data member
int ad_no; //private data member
float eng,math,science; //private
data member
float total; //private data member
float ctotal() //a function to
calculate eng + math + science with float return type.
{
return eng+math+science;
}
protected: //private access specifier
public: //public access specifier
void
Takedata() //member
function to Take data
{
cout<<"Enter
student name: "; cin>>sname;
cout<<"how many
number you want to enter: "
cin>>ad_no;
cout<<"Enter marks
of English: "; cin>>eng;
cout<<"Enter marks
of Mathematics: "; cin>>math;
cout<<"Enter marks
of Science: "; cin>>science;
total = ctotal();
}
void Showdata()
//member
function to Show data
{
cout<<"Student
name: "<< sname <<endl;
cout<<"The number
you enter is : "<< ad_no <<endl;
cout<<"Marks of
English: "<< eng <<endl;
cout<<"Marks of
Mathematics: "<< math <<endl;
cout<<"Marks of
Science: "<< science <<endl;
cout<<"Total
marks: "<<total;
}
}; //we must use
semicolon at the end of class.
int main() //main
function
{
student obj; //object
declaration
obj.Takedata();
obj.Showdata();
return 0;
}
Program 11:
#include <iostream>
using namespace std;
class batsman //create class by using name ‘batsman’ along with class
keyword
{
private: //private access
specifier
string name;
int b_code;
int
innings,notout,runs;
float
bat_avg;
float
cal_avg()
{
return
runs/(innings-notout);
}
public: //public access
specifier
void set_data() //member
function to set data
{
cout<<"Enter
the name of batsman : "<<endl;
cin>>name;
cout<<"Enter
the code of batsman : "<<endl;
cin>>b_code;
cout<<"Enter
total innings of batsman : "<<endl;
cin>>innings;
cout<<"Enter
total runs of batsman : "<<endl;
cin>>runs;
cout<<"Enter
numbers of Notout of batsman : "<<endl;
cin>>notout;
bat_avg=cal_avg();
cout<<"__________________"<<endl;
}
void get_data() //member
function to get data
{
cout<<"Name
of batsman : "<<name<<endl;
cout<<"Code
of batsman : "<<b_code<<endl;
cout<<"Total
innings :
"<<innings<<endl;
cout<<"Total
runs :
"<<runs<<endl;
cout<<"Notout : "<<notout<<endl;
cout<<"Average
of Batsman is : "<<bat_avg<<endl;
cout<<"--------------------------------------------------"<<endl;
}
}; //we must use semicolon at the end of class.
int main() //main
function
{
batsman obj; //object
declaration
obj.set_data();
obj.get_data();
return 0;
}
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