Example: Basic Series Sum Calculator in C++

// Basic Series Sum Calculator
#include <iostream>

class SeriesSumCalculator {
private:
    int start;
    int end;
    int step;
    long long sum; // Use long long for potentially large sums

public:
    // Constructor to initialize start, end, and step
    SeriesSumCalculator(int s, int e, int st) : start(s), end(e), step(st), sum(0) {
        // Ensure step is positive and not zero
        if (step <= 0) {
            std::cout << "Error: Step must be positive. Setting step to 1." << std::endl;
            this->step = 1;
        }
    }

    // Method to calculate the sum of the series
    void calculateSum() {
        if (start > end) {
            std::cout << "Warning: Start value is greater than end value. Sum will be 0." << std::endl;
            sum = 0;
            return;
        }
        for (int i = start; i <= end; i += step) {
            sum += i;
        }
    }

    // Method to get the calculated sum
    long long getSum() const {
        return sum;
    }
};

int main() {
    // Step 1: Create an object for a series from 1 to 10 with step 1
    SeriesSumCalculator s1(1, 10, 1);
    s1.calculateSum();
    std::cout << "Sum of series (1 to 10, step 1): " << s1.getSum() << std::endl;

    // Step 2: Create an object for a series from 5 to 20 with step 2
    SeriesSumCalculator s2(5, 20, 2);
    s2.calculateSum();
    std::cout << "Sum of series (5 to 20, step 2): " << s2.getSum() << std::endl;

    return 0;
}