#include<iostream>
using namespace std;
class student
   {
   public:
   student()
   {
   cout<< "Default Constructor";
   }
 };
int main()
   {
student s;
return 0;
   }
    

 
#include<iostream>
using namespace std;
class student
   {
   public:
   int id,rn;
   student(int i ,int rn)
   {
   id=i;
   rn=r;
   }
   void show()
   {
   cout<< "Id is" << id;
   cout<< " Roll no is" << rn;
   }
 };
int main()
   {
student s= student (1,101);
s.show();
return 0;
   }
    

 
#include<iostream>
using namespace std;
class student
   {
   public:
   int id,rn;
   student(int i ,int rn)
   {
   id=i;
   rn=r;
   }
   student(student &stu)
   {
   id=stu.id;
   rn=stu.rollno;
   }
   void show()
   {
   cout<< "Id is" << id;
   cout<< " Roll no is" << rn;
   }
 };
int main()
   {
student s= student (1,101);
student s2=s;
s.show();
return 0;
   }
    

 
#include<iostream>
using namespace std;
class add
   {
   public:
   int c;
   add()   //Constructor with no arguments
   {
   c=0;
   }
   //Constructor with two arguments
   add(int a ,int b)
   {
   c=a+b;
   }
  void show()
   {
  cout<< c << endl;
   }
 };
int main()
{
add obj;
add obj(10,20);
obj.show();
obj2.show();  
return 0;					
}    

 
#include<iostream>
using namespace std;
class student
   {
   public:
   student()
   {
   cout<< "Constructor Called";
   }
   ~student()
   {
   cout<< "Destructor Called";
   }
 };
int main()
   {
student s;
return 0;
   }