example3_handling_flags.cpp

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#include <iostream>
#include <string>
#include <algorithm>

int main(int argc, char* argv[]) {
    bool verbose = false;
    std::string inputFile;
    std::string outputFile;

    for (int i = 1; i < argc; ++i) {
        std::string arg = argv[i];
        if (arg == "-v" || arg == "--verbose") {
            verbose = true;
        } else if (arg == "-i" || arg == "--input") {
            if (i + 1 < argc) {
                inputFile = argv[++i];
            } else {
                std::cerr << "Error: Input file name missing" << std::endl;
                return 1;
            }
        } else if (arg == "-o" || arg == "--output") {
            if (i + 1 < argc) {
                outputFile = argv[++i];
            } else {
                std::cerr << "Error: Output file name missing" << std::endl;
                return 1;
            }
        } else {
            std::cerr << "Unknown argument: " << arg << std::endl;
            return 1;
        }
    }

    if (inputFile.empty() || outputFile.empty()) {
        std::cerr << "Usage: " << argv[0] << " -i <input_file> -o <output_file> [-v]" << std::endl;
        return 1;
    }

    if (verbose) {
        std::cout << "Input file: " << inputFile << std::endl;
        std::cout << "Output file: " << outputFile << std::endl;
    }

    // File processing logic would go here

    std::cout << "File processing complete." << std::endl;
    return 0;
}