I have a section of code where the user enters input from the keyboard. I want to do something when ENTER is pressed. I am checking for '\n' but it's not working. How do you check if the user pressed the ENTER key?

if( shuffle == false ){
    int i=0;
    string line;
    while( i<20){
        cout << "Playing: ";
        songs[i]->printSong();
        cout << "Press ENTER to stop or play next song: ";
        getline(cin, line);            
        if( line.compare("\n") == 0 ){
            i++;
        }
    }
}