一個結構體陣列中存放有若干學生的資訊，每個學生有若干門課程的成績，計算每個學生的平均成績，並根據平均成績由高到低的順序輸出每個學生的學號、姓名、和平均成績（下面的程式碼裡面用指標的三種表示方法實現輸出）；

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

struct student{
    string num;
    string name;
    int score[3];
    double avg;
};
int main()
{
    student stu[5]={ {"2011001"
 
,"zhao",{78,65,89}},
                     {"2011002","qian",{76,91,62}},
                     {"2011003","sun",{85,79,92}},
                     {"2011004","li",{93,61,72}},
                     {"2011005","zhou",{92,75,98}} 
                    };
    for (int i = 0; i < 5; i++)
    {
        int sum=0,num=0;
        for
 
 (int j = 0; j < 3; j++)
        {
            sum+=stu[i].score[j];
            num++;
        }
        stu[i].avg=sum/num;
    }
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            if (stu[j].avg<stu[j+1].avg)
            {
                student temp;
                temp=stu[j];
                stu[j]=stu[j+1
 
];
                stu[j+1]=temp;
            }
        }
    }
    student *p;
    p=stu;
    cout<<"學號\t姓名\t平均成績"<<endl;
    for (int i = 0; i <5; i++)
    {
        cout<<(*(p+i)).num<<"\t";
        cout<<(*(p+i)).name<<"\t";
        cout<<(*(p+i)).avg<<"\t"<<endl;
    }
    cout<<endl<<"學號\t姓名\t平均成績"<<endl;
    for (int i = 0; i <5; i++)
    {
        cout<<(p+i)->num<<"\t";
        cout<<(p+i)->name<<"\t";
        cout<<(p+i)->avg<<"\t"<<endl;
    }
       cout<<endl<<"學號\t姓名\t平均成績"<<endl;
    for (int i = 0; i <5; i++)
    {
        cout<<p[i].num<<"\t";
        cout<<p[i].name<<"\t";
        cout<<p[i].avg<<"\t"<<endl;
    }
    getchar();
    getchar();
    return 0;
}