设有学生信息如下：学号（长整型）、姓名（字符串型）、年龄（整型）、课程1成绩（实型）、课程2成绩（实型）、课程3成绩（实型）、课程4成绩（实型）、课程5成绩（实型）、课程6成绩（实型）、总分（实型）、平均分（实型）。试编写程序，输入3个学生的上述信息，计算每个学生的总分、平均分，然后输出每个学生学号、姓名、总分、平均分.

下面是一份 C++ 代码，可以实现上述功能：

#include <iostream>
#include <string>
using namespace std;

struct Student {
    long long id;
    string name;
    int age;
    double score1, score2, score3, score4, score5, score6;
    double totalScore, averageScore;
};

int main() {
    const int NUM_STUDENTS = 3;
    Student students[NUM_STUDENTS];

    for(int i = 0; i < NUM_STUDENTS; i++) {
        cout << "Enter student " << i+1 << " information: " << endl;
        cout << "ID: ";
        cin >> students[i].id;
        cout << "Name: ";
        cin >> students[i].name;
        cout << "Age: ";
        cin >> students[i].age;
        cout << "Scores (6): ";
        cin >> students[i].score1 >> students[i].score2 >> students[i].score3 
            >> students[i].score4 >> students[i].score5 >> students[i].score6;

        students[i].totalScore = students[i].score1 + students[i].score2 + students[i].score3
                                + students[i].score4 + students[i].score5 + students[i].score6;
        students[i].averageScore = students[i].totalScore / 6.0;
    }

    cout << "Student Information: " << endl;
    for(int i = 0; i < NUM_STUDENTS; i++) {
        cout << "ID: " << students[i].id << endl;
        cout << "Name: " << students[i].name << endl;
        cout << "Total Score: " << students[i].totalScore << endl;
        cout << "Average Score: " << students[i].averageScore << endl;
    }

    return 0;
}

这里使用了一个结构体 `Student` 来存储每个学生的信息，包括学号、姓名、年龄、6门课程的成绩、总分和平均分。首先通过输入三个学生的信息，计算出他们的总分和平均分，最后输出每个学生的学号、姓名、总分和平均分。