Write a c++ program to find out the sum of an A.P. series using constructor and destructor.

Constructor

The constructor T4Tutorials_AP_Series() is a member function of the class T4Tutorials_AP_Series. The constructor T4Tutorials_AP_Series()has the same name as the name of its class T4Tutorials_AP_Series.

When a new object T4Tutorials_AP_Series a; of the class T4Tutorials_AP_Seriesis executed, the constructor T4Tutorials_AP_Series() also executed automatically.
The constructor T4Tutorials_AP_Series()has no data type. Even we can’t use void also.
The constructor T4Tutorials_AP_Series()can have arguments.
The constructor T4Tutorials_AP_Series()can be only public.
There is no inheritance of the constructor T4Tutorials_AP_Series().

#include<iostream>
using namespace std;
class T4Tutorials_AP_Series
{
	protected :
		int n1, df, n2, i, ln, s1;
	public :
		T4Tutorials_AP_Series()
		{
		    s1 = 0;
		    cout << "Please input  the starting number of the A.P. series: "<<endl;
		    cin >> n1;
		    cout << "Please input the number of items for  the A.P. series: "<<endl;
		    cin >> n2;
		    cout << "Please input  the common difference of A.P. series: "<<endl;
		    cin >> df;
		    s1 = (n2 * (2 * n1 + (n2 - 1) * df)) / 2;
		    ln = n1 + (n2 - 1) * df;
		    cout << "The Sum of the  A.P. series are : "<<endl;
		    for (i = n1; i <= ln; i = i + df) 
		    {
		        if (i != ln)
		            cout << i << " + ";
		        else
		            cout << i << " = " << s1 << endl;
		    }
		}

};
int main()
{
	T4Tutorials_AP_Series a;
}

#include<iostream>

using namespace std;

class T4Tutorials_AP_Series

{

protected :

int n1, df, n2, i, ln, s1;

public :

T4Tutorials_AP_Series()

{

s1 = 0;

cout << "Please input the starting number of the A.P. series: "<<endl;

cin >> n1;

cout << "Please input the number of items for the A.P. series: "<<endl;

cin >> n2;

cout << "Please input the common difference of A.P. series: "<<endl;

cin >> df;

s1 = (n2 * (2 * n1 + (n2 - 1) * df)) / 2;

ln = n1 + (n2 - 1) * df;

cout << "The Sum of the A.P. series are : "<<endl;

for (i = n1; i <= ln; i = i + df)

{

if (i != ln)

cout << i << " + ";

else

cout << i << " = " << s1 << endl;

}

};

int main()

{

T4Tutorials_AP_Series a;

}

Destructor

The destructor ~T4Tutorials_AP_Series() is a member function of the class T4Tutorials_AP_Series. Destructor ~T4Tutorials_AP_Series() has the same name as the name of its class T4Tutorials_AP_Series. The tild sign ∼ is used before the name of the destructor ~T4Tutorials_AP_Series().

When the object T4Tutorials_AP_Series a; of the class T4Tutorials_AP_Seriesdestroyed, then the destructor ~T4Tutorials_AP_Series() also destroyed automatically.
One class T4Tutorials_AP_Series can have only one destructor ~T4Tutorials_AP_Series(). However, one class can have many constructors.
Destructor ~T4Tutorials_AP_Series()overloading is impossible.
The Destructor ~T4Tutorials_AP_Series()can’t have any arguments(parameters).
The destructor ~T4Tutorials_AP_Series()has no data type.

#include<iostream>
using namespace std;
class T4Tutorials_AP_Series
{
	protected :
		int n1, df, n2, i, ln, s1;
	public :
		~T4Tutorials_AP_Series()
		{
		    s1 = 0;
		    cout << "Please input  the starting number of the A.P. series: "<<endl;
		    cin >> n1;
		    cout << "Please input the number of items for  the A.P. series: "<<endl;
		    cin >> n2;
		    cout << "Please input  the common difference of A.P. series: "<<endl;
		    cin >> df;
		    s1 = (n2 * (2 * n1 + (n2 - 1) * df)) / 2;
		    ln = n1 + (n2 - 1) * df;
		    cout << "The Sum of the  A.P. series are : "<<endl;
		    for (i = n1; i <= ln; i = i + df) 
		    {
		        if (i != ln)
		            cout << i << " + ";
		        else
		            cout << i << " = " << s1 << endl;
		    }
		}

};
int main()
{
	T4Tutorials_AP_Series a;
}