Write a C++ program to Calculate the sum of the given series (1 + 2 + 3 + 4 + 5 + ... + n series) upto n terms, where n is entered by the user.

Write a C++ program to Calculate the sum of the given series (1 + 2 + 3 + 4 + 5 + ... + n series) upto n terms, where n is entered by the user.

Program Code:

#include<iostream>

using namespace std;

int main()

{

int i,n;

int sum=0;

cout<<"Enter the value of n for the series : ";

cin>>n;

cout<<endl;

for(i=1;i<=n;i++)

{

sum+=i;

}

cout<<"Sum of the the series 1+2+3+...............+n is : "<<sum;

return 0;

}

The program output is tested on www.jdoodle.com

Output:

Enter the value of n for the series : 15

Sum of the the series 1+2+3+...............+n is : 120

Thanks

Mukesh Rajput