//====================================== // CodeName : SD and variance calculator // Done for : shuvalaxmi mishra // By : Babak Sheykhan // Date : Nov 25, 2017 // // Input Example: // 5 <- number of samples // 20 // 31 // 50 // 69 // 80 //======================================= #include #include #include #include #include class SD_var { public: SD_var(double mean = 0.0, double sDiv = 0.0, double var = 0.0) : mean(mean), sd(sDiv), variance(var) { } void get_samples(); void calculate(); void printing() const; private: std::vector _data; double mean; double sd; double variance; }; void SD_var::get_samples() { int samples = 0, input = 0; std::cout << "How many sample do we have? "; std::cin >> samples; for (auto i = 0; i < samples; ++i) { std::cout << "Sample # " << i + 1 << ": "; std::cin >> input; _data.push_back(input); } } void SD_var::calculate() { int sum = std::accumulate(_data.begin(), _data.end(), 0); mean = sum / _data.size(); double sq_sum = 0.0; for (const auto &i : _data) sq_sum += pow(i - mean, 2); sd = sqrt(sq_sum / (_data.size() - 1)); variance = sd * sd; } void SD_var::printing() const { std::cout << "\nSamples are :\n"; for (const auto &i : _data) std::cout << std::setw(5) << i; std::cout << "\n------------------------\n"; std::cout << "Mean : " << mean << std::endl; std::cout << "SD : " << sd << std::endl; std::cout << "Variance : " << variance << std::endl; std::cout << "------------------------\n"; } int main() { SD_var test; test.get_samples(); test.calculate(); test.printing(); }

@shuvalaxmi_SD_variance