结果编译出问题。。。我不知道怎么改

#include <iostream>
using namespace std;
class Student
{public:
Student(int n,int a,float s):num(n),name(a),score(s){}
void total();
static float average();
private:
    int num;
    int name;
    float score;
    static float sum;
    static int count;
};
void Student::total()
{sum+=score;
count++;
}
float Student::average()
{return(sum/count);
}
float Student::sum=0;
int Student::count=0;
int main()
{Student stud[3]={
Student(0063,01,59),
Student(0064,02,99),
Student(0065,03,60)
};
int n;
cout<<"please input the number of students:";
cin>>n;
for(int i=0;i<n;i++)
stud[i].total();
cout<<"the average score of"<<n<<"students is"<<Student::average()<<endl;

int main()
{
    int i,max;
    int j[3]={59,99,60};
    max=j[0];
    for(i=0;i<=3;i++)
    if(j[i]>max)
    {max=j[i];
    }
cout<<"max="<<max<<endl;
return 0;
}

int main()
{
    int i,min;
    int j[3]={59,99,60};
    min=j[0];
    for(i=0;i<=3;i++)
    if(j[i]<min)
    {min=j[i];
    }
cout<<"min="<<min<<endl;
return 0;
}

#include <iostream>
using namespace std;
class Student
{public:
Student(int n,int a,float s):num(n),name(a),score(s){}
void total();
static float average();
private:
    int num;
    int name;
    float score;
    static float sum;
    static int count;
};
void Student::total()
{sum+=score;
count++;
}
float Student::average()
{return(sum/count);
}
float Student::sum=0;
int Student::count=0;
int main()
{Student stud[3]={
Student(0063,01,59),
Student(0064,02,99),
Student(0065,03,60)
};
int n;
for(int i=0;i<n;i++)
stud[i].total();
cout<<"the average score of"<<n<<"students is"<<Student::average()<<endl;
{    int i,max=0,min=0;
    int j[3]={59,99,60};
    max=j[0];
    for(i=0;i<=3;i++)
    if(j[i]>max)
    {max=j[i];
}cout<<"max="<<max<<endl;

 min=j[0];
    for(i=0;i<=3;i++)
    if(j[i]<min)
    {min=j[i];
}cout<<"min="<<min<<endl;
}
return 0;
}

#include <iostream>
#include <vector>
#include <string>

using namespace std;

class student
{
public:
    student(int n, string nam, float s) : no(n), name(nam), score(s) {}

    int no;
    char num;
    string name;
    float score;
};

    int main()
    {
        char ch;

        std::vector<student> vecStu;
        cout << "输入q结束" << endl;
        int num;
        std::string name;
        float score;
        while(ch != 'q')
        {
            cout<<"请输入学生1的学号:";
            cin>>num;
            cout<<"请输入学生1的姓名:";
            cin>>name;
            cout<<"请输入学生1的成绩:";
            cin>>score;

            student stu(num, name, score);
            vecStu.push_back(stu);
        }

        if(vecStu.size() > 0)
        {
            int max = 0, min = 0;
            float sum = 0.0f;
            for (int index = 1; index < vecStu.size(); ++index)
            {
                sum += vecStu.at(index).score;
                if(vecStu.at(index).score > vecStu.at(max).score)
                {
                    max = index;
                }
                else if(vecStu.at(index).score < vecStu.at(min).score)
                {
                    min = index;
                }
            }
            cout<<"平均分:"<<"ave="<<sum/vecStu.size()<<endl;
            cout<<"最高分学号:"<<vecStu[max].num<<"最高分姓名:"<<vecStu[max].name<<"最高分分数:"<<vecStu[max].score<<endl;
            cout<<"最低分学号:"<<vecStu[min].num<<"最低分姓名:"<<vecStu[min].name<<"最低分分数:"<<vecStu[min].score<<endl;
        }

        return 0;
    }