70: Write a program in C++ to calculate the series (1) + (1+2) + (1+2+3) + (1+2+3+4) + ... + (1+2+3+4+...+n).

 

// Write a program in C++ to calculate the series (1) + (1+2) + (1+2+3) +
// (1+2+3+4) + ... + (1+2+3+4+...+n). Go to the editor
//     Sample Output:
//     Input the value for nth term: 5
//     1 = 1
//     1+2 = 3
//     1+2+3 = 6
//     1+2+3+4 = 10
//     1+2+3+4+5 = 15
//     The sum of the above series is: 35
//     *****************************************************************

#include <iostream>
using namespace std;
int main()
{
    int num, a, sum = 0;
    cout << "\nEnter a number: ";
    cin >> num;

    cout << "\n********************************************\n\n";

    for (int i = 1; i <= num; i++)
    {
        a = 0;
        for (int j = 1; j <= i; j++)
        {

            cout << j;
            a = a + j;
            if (j < i)
            {
                cout << '+';
            }
        }
        cout << " = ";
        cout << a;
        sum = sum + a;
        cout << endl;
    }
    cout << "Sum of the above series is: " << sum;
    cout << "\n\n********************************************\n\n";

    return 0;
}


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