getline函数未在gdb中接受输入

Question

protected:
    string department;
    public:
    void get_data(){

        cout<<"enter the name:"<<endl;
        cin>>name;

        cout<<"enter the salary"<<endl;
        cin>>salary;

        cout<<"enter the department"<<endl;
        getline(cin,department);

这种格式不作为部门的输入。但是，如果将getline语句放在所有这样的语句的顶部：

protected:
    string department;
    public:
    void get_data(){
        cout<<"enter the department"<<endl;
        getline(cin,department); 

        cout<<"enter the name:"<<endl;
        cin>>name;

        cout<<"enter the salary"<<endl;
        cin>>salary;

然后将其输入部门。为什么会这样？（在gdb中）