Solution: The Data Cleaner

// Solution: validating and cleaning data using stream states
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
void createRawData() {
    std::ofstream file("raw_readings.txt");
    file << "23.5\n";
    file << "24.1\n";
    file << "ERROR_READING\n";
    file << "22.8\n";
    file << "INVALID\n";
    file << "25.0\n";
}
int main() {
    createRawData();
    std::ifstream inputFile("raw_readings.txt");
    std::ofstream outputFile("clean_readings.txt");
    if (!inputFile || !outputFile) {
        std::cerr << "Error opening files.\n";
        return 1;
    }
    std::string line;
    while (std::getline(inputFile, line)) {
        std::stringstream ss(line);
        double value;
        // Attempt to extract a double from the string stream
        ss >> value;
        // Check if the extraction succeeded
        if (!ss.fail()) {
            outputFile << value << "\n";
        } else {
            std::cout << "Skipping invalid line: " << line << "\n";
        }
    }
    std::cout << "Data cleaning complete." << std::endl;
    return 0;
}