Писал ли на C++

#include <iostream>
#include <vector>

double mean(const std::vector<double>& data) {
    double sum = 0.0;
    for (const auto& val : data) {
        sum += val;
    }
    return sum / data.size();
}

int main() {
    std::vector<double> values = {1.2, 3.4, 5.6, 7.8};
    std::cout << "Mean: " << mean(values) << std::endl;
    return 0;
}