正在从标准输入中读取多种类型

Question

我是C ++的新手，我遇到了从标准输入读取多种类型的问题。我正在尝试输入诸如：

Smith 93 91 47 90 92 73 100 87
Carpenter 75 90 87 92 93 60 0 98

并且针对每一行提取不同的字段，并将它们存储为结构和向量。运行main.cpp后，我得到的输出是：

Smith
rpenter

未将完整字符串'Carpenter'完全读入Student_info.name。它被切断为“木匠”。不知道我的问题在这里。谁能帮忙解决这个问题？

struct Student_info {
    std::string name;
    double midterm, final;
    std::vector<double> homework;
};

// read homework grades from an input stream into a vector<double>
istream& read_hw(istream& in, vector<double>& hw) {
    if(in) {
        // get rid of previous contents
        hw.clear();

        // read homework grades
        double x;
        while(in >> x) {
            hw.push_back(x);
        }
        // clear the stream so that input will work for the next student
        in.clear();
    }
    return in;
}

istream& read(istream& is, Student_info& s) {
    // read and store the student's name and midterm and final exam grades
    is >> s.name >> s.midterm >> s.final;

    read_hw(is, s.homework); // read and store all the student's homework grades
    return is;
}

main.cpp

int main() {
    vector<Student_info> students;
    Student_info record;
    string::size_type maxlen = 0;
    while(read(cin, record)) {
        maxlen = max(maxlen, record.name.size());
        students.push_back(record);
    }

    for(vector<Student_info>::size_type i = 0; i != students.size(); ++i) {
        cout << students[i].name << endl; 
    }

return 0;
}

Answer 1

用此替换read_hw()函数中的while循环：

while (in.peek() != '\n' && in >> x) {
    hw.push_back(x);
}

但是请注意，您必须在单独的行中输入每个学生记录。