cin.getline 不允许用户输入值[重复]

Question

可能重复：
cin.getline() is skipping an input in C++

我正在研究 C++，以获取 2 部电影的一些数据，如下所示：

    struct Movie m1, m2;
    cout << "Enter first movie title: ";
    cin.getline(m1.title, 30); 
    cout << "Enter first movie director: ";
    cin.getline(m1.director, 30); 
    cout << "Enter first movie length: ";
    cin >> m1.length; 

    cout << "Enter second movie title: ";
    cin.getline(m2.title, 30);
    cout << "Enter second movie director: ";
    cin.getline(m2.director, 30); 
    cout << "Enter second movie length: ";
    cin >> m2.length;

但是，令我惊讶的是，在输出中输入第二部电影的标题并不是我的全部。这是输出

Enter first movie title: Girl

Enter first movie director: GirlD

Enter first movie length: 10

Enter second movie title: Enter second movie director: Boy

Enter second movie length: 20

Answer 1

cin >> m1.length;，它只读取数字，所以它离开\n，下一个getline会读取空行，所以你可以这样读取：

string temp;
cin.getline(temp, 30);
stringstream sst(temp);
sst >> m1.lenght;