c++ - C++ CIN cin随机跳过

我有这个程序，但是cin会随机跳过..我的意思是有时它会，有时却不会。任何想法如何解决这一问题？

    int main(){


        /** get course name, number of students, and assignment name **/
        string course_name;
        int numb_students;
        string assignment_name;
        Assignment* assignment;

        cout << "Enter the name of the course" << endl;
        cin >> course_name;

        cout << "Enter the number of students" << endl;
        cin >> numb_students;

        cout << "Enter the name of the assignment" << endl;
        cin >> assignment_name;

        assignment = new Assignment(assignment_name);

        /** iterate asking for student name and score **/
        int i = 0;
        string student_name;
        double student_score = 0.0;
        while( i < numb_students ){

            cout << "Enter the name for student #" << i << endl;
            cin >> student_name;
            cout << "Enter the score for student #" << i << endl;
            cin >> student_score;
            assignment->addScore( Student( student_name, student_score ));
            i++;
        }
}

好，我知道了。对于任何想知道这里更新代码的人:

int main(){

    /** get course name, number of students, and assignment name **/
    string course_name;
    int numb_students;
    string assignment_name;

    cout << "Enter the name of the course" << endl;
    getline(cin, course_name);

    cout << "Enter the number of students" << endl;
    string temp;
    getline(cin, temp);
    numb_students = atoi(temp.c_str());

    cout << "Enter the name of the assignment" << endl;
    getline(cin, assignment_name);

    Assignment assignment(assignment_name);

    /** iterate asking for student name and score **/
    int i = 0;
    string student_name;
    double student_score = 0.0;
    while( i < numb_students ){

        cout << "Enter the name for student #" << i+1 << endl;
        getline(cin, student_name);
        cout << "Enter the score for student #" << i+1 << endl;
        getline(cin, temp);
        student_score = atof(temp.c_str());
        assignment.addScore( Student( student_name, student_score ));
        i++;
    }

最佳答案

我想您的某些输入中有空格，>>运算符将其视为特定输入项的结尾。 iostreams >>运算符的确不是为交互式输入而设计的，尤其是对于字符串-您应考虑使用getline()代替。

另外，您不必要地使用动态分配:

assignment = new Assignment(assignment_name);

最好写成:

Assignment assignment(assignment_name);

您应该尽可能避免在代码中使用'new'，而是让编译器为您处理对象生存期。