#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cmath>

void saveListToFile(const std::vector<double>& data, const std::string& filename) {
    std::ofstream outFile(filename);
    if (outFile.is_open()) {
        for (const auto& value : data) {
            outFile << value << "\n";
        }
        outFile.close();
    } else {
        std::cerr << "Unable to open file";
    }
}

void generateWaveform(const std::vector<double>& data) {
    for (const auto& value : data) {
        int amplitude = static_cast<int>(value * 10); // Scale for visibility
        std::cout << std::string(std::abs(amplitude), amplitude > 0 ? '+' : '-') << "\n";
    }
}

int main() {
    std::vector<double> data = {0.1, 0.4, 0.8, 0.5, -0.3, -0.7, -0.4, 0.2};
    saveListToFile(data, "data.txt");
    generateWaveform(data);
    return 0;
}