请教关于字符串的输入问题

#include<iostream>
#include<string>
using namespace std;
class stu
{
public:
    void set();
    void put();
private:
    int num;
    string name;
    string phone;
};
void stu::set()
{
    cout << "num is:";
    cin >> num;
    cout << "name is:";
    cin>>name;
    cout << "phone is:";
    cin >> phone;
    cout<<endl;
}
void stu::put()
{
    cout << "num\t" << "name\t" << "phone" << endl;
    cout << num << "\t" << name << "\t" << phone << endl;
}
int main()
{
    class stu student1;
    student1.set();
    student1.put();
    return 0;
}