大家好！帮忙改一下吧！运行时有误，但找不出来。“利用面向对象的思想设计一个班级学生成绩管理系统”

/*2．利用面向对象的思想设计一个班级学生成绩管理系统。要求：
(1)要求存储学生的姓名、编号及各门成绩；
(2)可以对每个学生的各门成绩进行求和、求平均；
(3)能够实现对每门课程求和、求平均、求最高分和不及格的学生人数；
(4)能够实现成绩的打印和不及格学生的名单的打印。
我编的是三个学生三门课的*/
#include<iostream>
#include<string>
using namespace std;
class Stu{
public:
    Stu(char* name1,char* number1)
    {
        name=name1;
        number=number1;
    }
    void  Sum_Ave()
    {
        sum=0;
        ave=0;
        cout<<"请输入学生三门课成绩:";
        for(int i=0;i<3;++i)
            cin>>score[i];
        sum=score[1]+score[2]+score[3];
        ave=sum/3;
        cout<<"该学生的总分为:"<<sum<<"\t"<<"平均分为:"<<ave<<endl;
    }
    static void lesson(Stu &s1,Stu &s2,Stu &s3);
    static void no(Stu &s1,Stu &s2,Stu &s3)
    {
        for(int i=0;i<3;i++)
        {   
            if(s1.score[i]<60)
               num[i]++;
            if(s2.score[i]<60)
               num[i]++;
            if(s3.score[i]<60)
               num[i]++;
            cout<<"第"<<i<<"不及格学生的人数为:"<<num[i]<<endl;
        }
    }
private:
    char* name;
    char* number;
    float* score;
    float sum;
    float ave;
    static float* eversum;
    static float* everave;
    static float* high;
    static int *num;
};

void Stu::lesson(Stu &s1,Stu &s2,Stu &s3)
{
        for(int i=0;i<3;i++)
        
        {    eversum[i]=s1.score[i]+s2.score[i]+s3.score[i];
            everave[i]=eversum[i]/3;
        }
        for(int j=0;j<3;j++)
        
        {   if(s1.score[j]>s2.score[j])
                 high[j]=s1.score[j];
            
            high[j]=s2.score[j];
            
            if(high[j]<s3.score[j])
            
                 high[j]=s3.score[j];
            }
            cout<<"第"<<i<<"课程的总分为:"<<eversum[i]<<endl;
            cout<<"第"<<i<<"课程的平均分为:"<<everave[i]<<endl;
            cout<<"第"<<j<<"课程的最高分为:"<<high[j]<<endl;

}
int* Stu::num=0;
float* Stu::eversum=0;
float* Stu::everave=0;
float* Stu::high=0;
int main()
{
    Stu student1("lili","201112");
    student1.Sum_Ave();

    Stu student2("nana","201113");
    student2.Sum_Ave();
   
    Stu student3("dodo","201114");
    student3.Sum_Ave();
   
    Stu::lesson(student1,student2,student3);
    Stu::no(student1,student2,student3);
    return 0;
}