#include <iostream>
#include <fstream>
#include <string>
#include <stdexcept>

void readFileAndWriteToFile() {
    std::ifstream inputFile("input.txt");
    std::ofstream outputFile("output.txt");

    if (!inputFile.is_open()) {
        throw std::runtime_error("Unable to open input file.");
    }

    if (!outputFile.is_open()) {
        throw std::runtime_error("Unable to create/open output file.");
    }

    std::string line;
    while (std::getline(inputFile, line)) {
        outputFile << line << std::endl;
    }

    inputFile.close();
    outputFile.close();
}

int main() {
    try {
        readFileAndWriteToFile();
        std::cout << "Data copied from input.txt to output.txt successfully." << std::endl;
    } catch (std::exception& ex) {
        std::cout << "Exception caught: " << ex.what() << std::endl;
    }

    return 0;
}