Write a c++ program to find out the sum of an A.P. series by using the classes and objects in object-oriented programming.

#include<iostream> using namespace std; class T4Tutorials { protected : int n1, df, n2, i, ln, s1; public : int apseries() { s1 = 0; cout << "Find out the sum of A.P. series :"<<endl; cout << "----"<<endl; cout << "Input the starting number of the A.P. series: "<<endl; cin >> n1; cout << "Input the number of items for the A.P. series: "<<endl; cin >> n2; cout << "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 << " + "<<endl; else cout << i << " = " << s1 << endl; } } }; int main() { T4Tutorials a; a.apseries(); }

**Output**

Input the starting number: 2

Input the number of items: 4

Input the common difference: 6

the Sum of the A.P. series are :

2+8+14+20=44