求教，为什么字符串变量遇到空格中断输出？如何解决？

#include<iostream>
#include<string>
using namespace std;
class Student
{
    protected:
        int num;
        string name;
        char sex;
    public:
        void set()
        {
            cout<<"num:";
            cin>>num;
            cout<<"name:";
            cin>>name;
            cout<<"sex:";
            cin>>sex;
        }
        void display()
        {
            cout<<"num:"<<num<<endl;
            cout<<"name:"<<name<<endl;
            cout<<"sex:"<<sex<<endl;
        }
        ~Student(){};
};
class Student1:public Student
{
private:
    int age;
    string addr;
public:
    void set_1()
    {
        set();
        cout<<"age:";
        cin>>age;
        cout<<"address:";//调用set_1时运行到这里停止
        getline(cin,addr);
    }
    void display_1()
    {
        display();
        cout<<"age:"<<age<<endl;
        cout<<"address:"<<addr<<endl;
    }
    ~Student1(){}
};
int main()
{
    Student1 s;
    s.set_1();//在输出"address:"后开始执行接下来的语句
    putchar(10);
    s.display_1();
    return 0;
}