// Courtesy of ChatGPT
    ​
    // Link against the Core Foundation framework by passing `-framework CoreFoundation` to the compiler
    ​
    #include <iostream>
    #include <string>
    #include <CoreFoundation/CoreFoundation.h>
    ​
    int main()
    {
        CFLocaleRef localeRef = CFLocaleCopyCurrent();
        CFStringRef languageCodeRef = CFLocaleGetValue(localeRef, kCFLocaleLanguageCode);
        CFIndex bufferSize = CFStringGetLength(languageCodeRef) + 1;
        char* languageCode = new char[bufferSize];
        CFStringGetCString(languageCodeRef, languageCode, bufferSize, kCFStringEncodingUTF8);
        std::string result = languageCode;
        delete[] languageCode;
        std::cout << "User's locale: " << result << std::endl;
        CFRelease(localeRef);
        return 0;
    }