Question

我正在尝试在for循环中输入一个vector [i]，并且它说“＆lt;＆lt;”会出现问题。

我不是为任何人制作这个，我只是为了练习这样做。我不明白为什么我不能吹捧学生的载体。

来源：

int main()
{
    struct STUDENT
    {
        int id = 0;
        string name;
    };

    int inc = 0;
    int numstud;

    cout << "Enter number of Students: ";
    cin >> numstud;

    vector<STUDENT> student;

    student.resize(numstud);

    for (vector<STUDENT>::size_type i = 0; i < numstud; i++)
    {
        student[i].id = inc++;
    }

    for (vector<STUDENT>::size_type i = 0; i < numstud; i++)
    {
        cout << student[i] << "\n"; //THE ERROR IS RIGHT HERE!!! with the "<<"
    }
}

我正在尝试运行时的错误：

1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(978): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,unsigned char)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(971): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const unsigned char *)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(964): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,signed char)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(957): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const signed char *)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(831): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(784): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const char *)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(746): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)'
1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\ostream(699): or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>    (std::basic_ostream<char,std::char_traits<char>> &,const char *)'

Answer 1

C ++并没有假设如何打印用户类型。您可以告诉它如何通过operator overloading或打印特定字段：

std::cout << student[i].<field>; //replace <field> with name or id

打印矢量学生for for循环？

1 个答案: