parameter constructor

[msrt92]

output is not corrector
its something like this
Name:___________Azzz
Natinality:_______Azzz

  #include<iostream.h>
class Citizen{
	private:
		char *name;
		char *nationality;
	public:
		// no parameter
		Citizen()
		{
			name=NULL;
			nationality=NULL;
		}
		// two parameter
		Citizen(char* nam, char* nation)
		{
			nam=new char [30];
			nation=new char [30];
			name=nam;
			nationality=nation;
		}

		void obj2display()
		{
			cout<<"2nd Object With Two Parameter"<<endl;
			cout<<"Name:"<<name<<endl;
			cout<<"Nationality:"<<nationality<<endl;
		}
};

void main ()
{
	Citizen c1("Sohaib","Pakistani");
	c1.obj2display();
}

[Codermik]

Line 16 should point to your name pointer, and line 17 should point to your nationality pointer.

name =new char [30];
nationality =new char [30];

Also remember you need to free the memory you allocated in the destructor.

delete [] name;
delete [] nationality;

[anup30]

#include<iostream> ///
using std::cout; ///
using std::endl; ///
class Citizen{
	private:
		char *name;
		char *nationality;
	public:
		// no parameter
		Citizen()
		{
			name=NULL;
			nationality=NULL;
		}
		// two parameter
		Citizen(char* nam, char* nation)
		{
			/// nam=new char [30];
			/// nation=new char [30];
			name=nam;
			nationality=nation;
		}

		void obj2display()
		{
			cout<<"2nd Object With Two Parameter"<<endl;
			cout<<"Name:"<<name<<endl;
			cout<<"Nationality:"<<nationality<<endl;
		}
};

void main ()
{
	Citizen c1("Anup","Bangladeshi");
	c1.obj2display();
}

[anup30]

void main () runs in visual studio, but not in gcc compiler.
so, use int main ()

[msrt92]

All of these three constructors are meant to initialize their respective objects. Incase of copy constructor, you are required to assign a separate space for the data members of the new object while copying the values of previously existed object.

Declare three objects (1 for each type of constructor) in main.

Write a function in class Citizen to display the initialized data members for each object.

Also write destructor for the class Citizen. Display a message that says "destructor called" in the destructor body.

  #include<iostream.h>
class Citizen{
	private:
		char *name;
		char *nationality;
	public:
		// no parameter
		Citizen()
		{
			name=NULL;
			nationality=NULL;
		}
		// two parameter
		Citizen(char* nam, char* nation)
		{
			name=new char [30];
			nationality=new char [30];
			name=nam;
			nationality=nation;
		}

		void obj2display()
		{
			cout<<"2nd Object With Two Parameter"<<endl;
			cout<<"Name:"<<name<<endl;
			cout<<"Nationality:"<<nationality<<endl;
		}

		~Citizen()
		{
			cout<<"Destructor is Called"<<endl;
		}
};

void main ()
{
	Citizen c1("Alex","USA");
	c1.obj2display();

	Citizen c2=c1;
}