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NB : These programs are compiled & executed in Dev C++ 5.11 application.
Example : A basic C++ program to show class-object concept ?
#include<iostream>
using namespace std;
class employee
{
public:
int salary1;
int salary2;
};
int main()
{
employee emp1;
employee emp2;
emp1.salary1=450;
emp1.salary2=210;
emp2.salary1=85;
emp2.salary2=23;
cout <<" First Object salary is : "<< emp1.salary1 << " and " << emp1.salary2<<endl;
cout <<" Second Object salary is : "<< emp2.salary1 << " and " << emp2.salary2;
return 0;
}
Output :
First Object salary is : 450 and 210
Second Object salary is : 85 and 23
NB: main() is always defined after class to declare object inside it that needs class name.
/* --------------------------- OR --------------------------- */
#include<iostream>
using namespace std;
class employee
{
public:
int salary1=5600;
int salary2=6300;
};
int main()
{
employee emp1;
employee emp2;
cout <<" First object salary is : "<< emp1.salary1 << " and " << emp1.salary2<<endl;
cout <<" Second object salary is : "<< emp2.salary1 << " and " << emp2.salary2;
return 0;
}
Output :
First object salary is : 5600 and 6300
Second object salary is : 5600 and 6300
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class user
{
public:
void message()
{
cout <<"Welcome U All in Codershelpline";
}
};
int main()
{
user x;
x.message();
return 0;
}
Output:
Welcome U All in Codershelpline
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class student
{
public:
int rollno ;
char sname[30];
};
int main()
{
student stu={34,"Robert"};
//cout<<stu.rollno<<" "<<stu.sname;
cout<<stu.rollno <<endl <<stu.sname;
return 0;
}
Output :
34
RobertExample : A typical C++ program to show class-object concept .
#include <iostream>
using namespace std;
class student
{
private:
char sname[50];
int srollno;
float cfee;
public:
void input()
{
cout << "Enter student name: " ;
cin >> sname;
cout << "Enter student roll number: ";
cin >> srollno;
cout << "Enter student course fee : ";
cin >> cfee;
}
void output()
{
cout<<endl<< "Student details are :\n";
cout<< "Student Name is = "<< sname <<endl;
cout<< "Student Roll Number is = " << srollno <<endl;
cout<< "Student Course Fee is = " << cfee;
}
};
int main()
{
student stu;
stu.input();
stu.output();
return 0;
}
Output:
Enter student name: Saini
Enter student roll number: 123
Enter student course fee : 2500
Student details are :
Student Name is = Saini
Student Roll Number is = 123
Student Course Fee is = 2500
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class student
{
public:
void output()
{
cout<<endl<< "Student details are :\n";
cout<< "Student Name is = "<< sname <<endl;
cout<< "Student Roll Number is = " << srollno <<endl;
cout<< "Student Course Fee is = " << cfee;
}
void input()
{
cout << "Enter student name: " ;
cin >> sname;
cout << "Enter student roll number: ";
cin >> srollno;
cout << "Enter student course fee : ";
cin >> cfee;
}
private:
char sname[50];
int srollno;
float cfee;
};
int main()
{
student stu;
stu.input();
stu.output();
return 0;
}
Output:
Enter student name: Navya
Enter student roll number: 34
Enter student course fee : 2400
Student details are :
Student Name is = Navya
Student Roll Number is = 34
Student Course Fee is = 2400
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
cout<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
stu.input();
stu.process();
stu.output();
return 0;
}
Output:
Enter first Number : 100
Enter second number: 50
The addition result is = 150
The subtraction result is = 50
The multiplication result is = 5000
The division result is = 2Example : A C++ program to show parameterized member functions/methods using class-object concept.
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input(int n1, int n2)
{
num1=n1;
num2=n2;
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
cout<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
stu.input(100,10);
stu.process();
stu.output();
return 0;
}
Output:
The addition result is = 110
The subtraction result is = 90
The multiplication result is = 1000
The division result is = 10Example : A C++ program to show nesting of member functions/methods using class-object concept.
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
input();
process();
cout<<endl<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
//stu.input();
//stu.process();
stu.output();
return 0;
}
Output:
Enter first Number : 500
Enter second number: 100
The addition result is = 600
The subtraction result is = 400
The multiplication result is = 50000
The division result is = 5
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
}
void process()
{
input();
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
process();
cout<<endl<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
//stu.input();
//stu.process();
stu.output();
return 0;
}
Output:
Enter first Number : 500
Enter second number: 100
The addition result is = 600
The subtraction result is = 400
The multiplication result is = 50000
The division result is = 5
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
process();
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
output();
}
void output()
{
cout<<endl<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
stu.input();
//stu.process();
//stu.output();
return 0;
}
Output:
Enter first Number : 500
Enter second number: 100
The addition result is = 600
The subtraction result is = 400
The multiplication result is = 50000
The division result is = 5
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
cout<<endl<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
void all()
{
input();
process();
output();
}
};
int main()
{
calculation stu;
stu.all();
return 0;
}
Output:
Enter first Number : 500
Enter second number: 100
The addition result is = 600
The subtraction result is = 400
The multiplication result is = 50000
The division result is = 5
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class calculation
{
private:
int num1,num2,sum,subtract,mult,div;
public:
void all()
{
input();
process();
output();
}
void input()
{
cout << "Enter first Number : " ;
cin >> num1;
cout << "Enter second number: ";
cin >> num2;
}
void process()
{
sum=num1+num2;
subtract=num1-num2;
mult=num1*num2;
div=num1/num2;
}
void output()
{
cout<<endl<<"The addition result is = "<<sum<<endl;
cout<<"The subtraction result is = "<<subtract<<endl;
cout<<"The multiplication result is = "<<mult<<endl;
cout<<"The division result is = "<<div;
}
};
int main()
{
calculation stu;
stu.all();
return 0;
}
Output:
Enter first Number : 500
Enter second number: 100
The addition result is = 600
The subtraction result is = 400
The multiplication result is = 50000
The division result is = 5Example : A C++ program to show member function/methods with return type using class-object concept.
#include <iostream>
using namespace std;
class addition
{
private:
int x,y,z;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> x;
cout << "Enter second number: ";
cin >> y;
}
int process()
{
z=x+y;
return z;
}
};
int main()
{
addition stu;
int p;
stu.input();
p=stu.process();
cout<<"The addition result is = "<<p;
return 0;
}
Output :
Enter first Number : 10
Enter second number: 20
The addition result is = 30
/* --------------------------- OR --------------------------- */
#include <iostream>
using namespace std;
class addition
{
private:
int x,y,z;
public:
void input()
{
cout << "Enter first Number : " ;
cin >> x;
cout << "Enter second number: ";
cin >> y;
}
int process()
{
z=x+y;
return z;
}
void output()
{
cout<<"The addition result is = "<<process();
}
};
int main()
{
addition stu;
stu.input();
stu.process();
stu.output();
return 0;
}
Output :
Enter first Number : 10
Enter second number: 20
The addition result is = 30Example : A C++ program to pass an object as arguments through a member function.
#include <iostream>
using namespace std;
class number
{
public:
int num = 210;
float val=23.12;
char ch='X';
void display(number obj2)
{
cout<<obj2.num<<endl;
cout<<obj2.val<<endl;
cout<<obj2.ch;
}
};
int main()
{
number obj1;
obj1.display(obj1);
return 0;
}
Output:
210
23.12
XExample : A C++ program to return an object and print/display through a member function.
#include <iostream>
using namespace std;
class student
{
public:
string sname;
int srollno;
float cfee;
student input(int num1, float num2, string str)
{
student stu1;
stu1.sname = str;
stu1.srollno = num1;
stu1.cfee = num2;
return stu1; //retrun object
}
void output(student stu2) //object as parameter
{
cout<<"Student Name: "<<stu2.sname<<endl;
cout<<"Roll No. : "<<stu2.srollno<<endl;
cout<<"Student Course Fee : "<<stu2.cfee<<endl;
}
};
int main()
{
student stu3,stu4;
stu4 = stu3.input(10130, 3500, "Mr.Ashok");
stu3.output(stu4);
return 0;
}
Output :
Student Name: Mr.Ashok
Roll No. : 10130
Student Course Fee : 3500
--------------------- OR -----------------------
#include <iostream>
using namespace std;
class number
{
public:
int num = 210;
float val=23.12;
char ch='X';
number display(number obj2)
{
return obj2;
}
};
int main()
{
number obj1, obj3;
obj3=obj1.display(obj1);
cout<<obj3.num<<" "<<obj3.val<<" "<<obj3.ch;
return 0;
}
Output:
210 23.12 XExample : A C++ program to show class-object concept using array of object .
#include <iostream>
using namespace std;
class student
{
private:
char sname[50];
int srollno;
float cfee;
public:
void input()
{
cout << "Enter student name: " ;
cin >> sname;
cout << "Enter student roll number: ";
cin >> srollno;
cout << "Enter student course fee : ";
cin >> cfee;
cout<<endl;
}
void output()
{
cout<<endl;
cout<< "Student Name is = "<< sname <<endl;
cout<< "Student Roll Number is = " << srollno <<endl;
cout<< "Student Course Fee is = " << cfee;
cout<<endl;
}
};
int main()
{
student stu[3];
int i;
for(i=0;i<3;i++)
{
stu[i].input();
}
cout<<endl<< "Student details are :\n";
for(i=0;i<3;i++)
{
stu[i].output();
}
return 0;
}
Output:
Enter student name: Reyansh
Enter student roll number: 52
Enter student course fee : 1200
Enter student name: Shreyansh
Enter student roll number: 23
Enter student course fee : 1300
Enter student name: Sonaya
Enter student roll number: 67
Enter student course fee : 1400
Student details are :
Student Name is = Reyansh
Student Roll Number is = 52
Student Course Fee is = 1200
Student Name is = Shreyansh
Student Roll Number is = 23
Student Course Fee is = 1300
Student Name is = Sonaya
Student Roll Number is = 67
Student Course Fee is = 1400Example : A C++ program to show class-object concept using scope resolution operator (::) ?
#include <iostream>
using namespace std;
class student
{
private:
char sname[50];
int srollno;
float tfee;
public:
void input();
void output();
};
void student::input()
{
cout << "Enter student name: " ;
cin >> sname;
cout << "Enter student roll number: ";
cin >> srollno;
cout << "Enter student tution fee : ";
cin >> tfee;
}
void student::output()
{
cout<<endl<< "Student details are :\n";
cout<< "Student Name is = "<< sname <<endl;
cout<< "Student Roll Number is = " << srollno <<endl;
cout<< "Student Course Fee is = " << tfee;
}
int main()
{
student stu;
stu.input();
stu.output();
return 0;
}
Output:
Enter student name: Reyansh
Enter student roll number: 84
Enter student course fee : 1100
Student details are :
Student Name is = Reyansh
Student Roll Number is = 84
Student Course Fee is = 1100
Example : A C++ program to show class-object having array of object with scope resolution operator (::).
#include <iostream>
using namespace std;
class student
{
private:
char sname[50];
int srollno;
float cfee;
public:
void input();
void output();
};
void student::input()
{
cout << "Enter student name: " ;
cin >> sname;
cout << "Enter student roll number: ";
cin >> srollno;
cout << "Enter student course fee : ";
cin >> cfee;
cout<<endl;
}
void student::output()
{
cout<<endl;
cout<< "Student Name is = "<< sname <<endl;
cout<< "Student Roll Number is = " << srollno <<endl;
cout<< "Student Course Fee is = " << cfee;
cout<<endl;
}
int main()
{
student stu[3];
int i;
for(i=0;i<3;i++)
{
stu[i].input();
}
cout<<endl<< "Student details are :\n";
for(i=0;i<3;i++)
{
stu[i].output();
}
return 0;
}
Output:
Enter student name: Shreyansh
Enter student roll number: 45
Enter student course fee : 3100
Enter student name: Reyansh
Enter student roll number: 34
Enter student course fee : 1200
Enter student name: Romana
Enter student roll number: 89
Enter student course fee : 1400
Student details are :
Student Name is = Shreyansh
Student Roll Number is = 45
Student Course Fee is = 3100
Student Name is = Reyansh
Student Roll Number is = 34
Student Course Fee is = 1200
Student Name is = Romana
Student Roll Number is = 89
Student Course Fee is = 1400
Example : A c++ program to create & use object from another class .
#include <iostream>
using namespace std;
class student1
{
private:
int x1,y1,z1;
public:
void input1()
{
cout <<endl<<"Enter first Number in class 1 : " ;
cin >> x1;
cout << "Enter second number in class 1 : ";
cin >> y1;
}
void process1()
{
z1=x1+y1;
}
void output1()
{
cout<<"The addition result of class 1 is = "<<z1<<endl;
}
};
class student2
{
private:
student1 stu1;
int x2,y2,z2;
public:
void input2()
{
cout << "Enter first Number in class 2 : " ;
cin >> x2;
cout << "Enter second number in class 2 : ";
cin >> y2;
stu1.input1();
}
void process2()
{
z2=x2+y2;
stu1.process1();
}
void output2()
{
cout<<endl<<"The addition result of class 2 is = "<<z2<<endl;
stu1.output1();
}
};
int main()
{
student2 stu2;
stu2.input2();
stu2.process2();
stu2.output2();
return 0;
}Example : A c++ program to represent friend function concept.
#include<iostream>
using namespace std;
class frifun
{
int a,b;
public:
void read()
{
a=90;
b=70;
}
friend void display(frifun obj2);
};
void display(frifun obj2)
{
cout<<obj2.a<<"\n"<<obj2.b;
}
int main ()
{
//clrscr();
frifun obj1;
obj1.read();
display(obj1);
return 0;
}Example : A c++ program in class-object to represent friend class concept.
#include <iostream>
using namespace std;
class A
{
int x =15;
friend class B; // friend class declaration.
};
class B
{
public:
void display(A &m)
{
cout<<"value of x is = "<<m.x;
}
};
int main()
{
A a;
B b;
b.display(a);
return 0;
}
Output :
value of x is = 15
/* ------------------- OR -------------------- */
#include <iostream>
using namespace std;
class Master
{
int val=40;
friend class Servant; // Class Servant is friend of Master class
};
class Servant
{
public:
void display(Master &m)
{
cout<<"The Value is : "<<m.val;
}
};
int main()
{
Master M;
Servant S;
S.display(M);
return 0;
}
Output :
The Value is : 40
/* ------------------- OR -------------------- */
#include <iostream>
using namespace std;
class Master
{
private:
char name[10]="Owner";
int amt = 4300;
public:
friend class Servant;
};
class Servant
{
public:
void output(Master m)
{
cout<<m.name<<endl;
cout<<m.amt<<endl;
}
};
int main()
{
Master M;
Servant S;
S.output(M);
return 0;
}
Output :
Owner
4300Example : An example of C++ program to show inline function.
#include<iostream>
using namespace std;
int info(int p);
int main ( )
{
int x;
cout << "\n Enter the Input Value: ";
cin>>x;
cout << "\n The Output is: " <<info(x);
return 0;
}
inline int info(int y)
{
return y*y;
}
Output :
Enter the Input Value: 6
The Output is: 36Example : An example of C++ program to show static data member.
#include<iostream>
using namespace std;
class stacon
{
static int c;
public:
void count()
{
c=c+1;
cout<<c<<" ";
}
};
int stacon::c=7;
int main ()
{
//clrscr();
stacon obj1,obj2;
obj1.count();
obj2.count();
obj1.count();
obj2.count();
return 0;
}
Output :
8 9 10 11
--------------------------- OR -------------------------
#include<iostream>
using namespace std;
class stacon
{
static int c;
int x=0;
public:
void count()
{
c=c+1;
x=x+1;
cout<<c<<"\t";
cout<<x<<" "<<"\n";
}
};
int stacon::c=7;
int main ()
{
//clrscr();
stacon obj1,obj2;
cout<<"Static"<<"\t"<<"Non-static"<<endl;
obj1.count();
obj2.count();
obj1.count();
obj2.count();
return 0;
}
Output:
Static Non-static
8 1
9 1
10 2
11 2
Example : A C++ program in class object to show static member function.
#include<iostream>
using namespace std;
class stacon
{
static int c;
static int x;
public:
static void count()
{
c=c+1;
x=x+1;
}
static void display()
{
cout<<c<<"\t";
cout<<x<<" "<<"\n";
}
};
int stacon::c=7;
int stacon::x=0;
int main ()
{
//clrscr();
//No need to create object.
stacon::count();
stacon::display();
stacon::count();
stacon::display();
return 0;
}
Output :
8 1
9 2Example : An example of C++ program to show Function Overloading.
#include <iostream>
using namespace std;
class A
{
int x;
int y;
int z;
public:
void display(int a)
{
x=a;
cout<<x<<endl;
}
void display(int p, int q)
{
x= p;
y= q;
cout<<x<<" "<<y;
}
void display(int p, int q, int r)
{
x= p;
y= q;
z= r;
cout<<x<<" "<<y<<" "<<z;
}
};
int main()
{
A obj;
obj.display(40);
obj.display(10,20);
obj.display(100,200,300);
return 0;
}
Output :
40
10 20
100 200 300
// ------------------------- OR ----------------------------
#include <iostream>
using namespace std;
class A
{
int x1,x2;
float y1,y2;
public:
void display(int a)
{
x1=a;
cout<<x1<<endl<<endl;
}
void display(int p, int q)
{
x1= p;
x2= q;
cout<<x1<<endl<<x2<<endl<<endl;
}
void display(double m, double n)
{
y1= m;
y2= n;
cout<<y1<<endl<<y2;
}
};
int main()
{
A obj;
obj.display(40);
obj.display(10,20);
obj.display(41.20,32.23);
return 0;
}
Output :
40
10
20
41.2
32.23 
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