cin.getline在第一次迭代后跳过输入

Question

我正在搞乱枚举，让这个程序几乎100％工作。

唯一的问题是当我在do-while循环的第二次迭代期间调用我的getFavMusic（）函数时，cin.getline完全跳过我的输入。

我已经阅读过有关输入流的新行字符的事情，但我尝试在没有cout语句中的\ n的情况下运行它无济于事。

为什么跳过并使用“”作为输入？

#include <iostream>
#include <cstring>
using namespace std;

enum musicGenres { RAP, HIPHOP, ROCK, INDIE, CLASSICAL, ALTERNATIVE };

void getFavMusic(musicGenres &);
void showFavMusic(musicGenres);

int main() {

    musicGenres currFav;
    char cont;

    do {
        getFavMusic(currFav);  //Ask Matt for his favorite music genre today and store it as a musicGenres (enum) type
        showFavMusic(currFav); //Output Matt's favorite music genre today by converting the musicGenres enum type to a cstring

        cout << "Enter another genre? (y or n): ";
        cin >> cont;
        cont = tolower(cont);
    } while (cont == 'y');

    return 0;
}

void getFavMusic(musicGenres &currFav) {

    char fav[20]; //Where input is stored

    cout << "Hey Matt! What's your favorite music today?\n";
    cin.getline(fav, 20); //Keeps skipping here after first entry

    for (int i = 0; i < strlen(fav); i++) { //Makes input all lowercase to simplify cstring checking in switch statement
        fav[i] = tolower(fav[i]);
    }

    if (!strcmp(fav,"hiphop") || !strcmp(fav,"hip hop")) // Compare cstring 'fav' with lowercase music genre names and assign musicGenres type values to currFav
        currFav = HIPHOP;
    else if (!strcmp(fav,"rap"))
        currFav = RAP;
    else if (!strcmp(fav,"rock"))
        currFav = ROCK;
    else if (!strcmp(fav, "indie"))
        currFav = INDIE;
    else if (!strcmp(fav, "classical"))
        currFav = CLASSICAL;
    else if (!strcmp(fav, "alternative"))
        currFav = ALTERNATIVE;
}

void showFavMusic(musicGenres currFav) {
    char fav[20];
    switch (currFav)
    {
    case HIPHOP:
        strcpy(fav, "Hip Hop");
        break;
    case RAP:
        strcpy(fav, "Rap");
        break;
    case ROCK:
        strcpy(fav, "Rock");
        break;
    case INDIE:
        strcpy(fav, "Indie");
        break;
    case CLASSICAL:
        strcpy(fav, "Classical");
        break;
    case ALTERNATIVE:
        strcpy(fav, "Alternative");
    }

    cout << "Matt's favorite music genre today is " << fav << '!' << endl;
}