#include<iostream>
#include<string>
using namespace std;
class student
{  
private:
    int no;
   string name;
   double deg1,deg2,deg3;
   static double sum1;
   static  double  sum2;
   static  double  sum3;
   static  int    count;
public:

      double av1,av2,av3;
    void student1()
    { cin>>no>>name>>deg1>>deg2>>deg3;
        sum1=sum1+deg1;
        sum2=sum2+deg2;
        sum3=sum3+deg3;}
    void ave1()
    { av1=sum1/count;}
    void ave2()
    { av2=sum2/count;}
    void ave3()
    {av3=sum2/count;}
static void disp()
{  cout<<"语文成绩的平均分为："<<sum1<<endl;
  cout<<"数学成绩的平均分为:"<<sum2<<endl;
  cout<<"英语成绩的平均分为："<<sum3<<endl;}
 
};
double student::sum1=0;
double student::sum2=0;
double student::sum3=0;
int main()
{ int count,a;
    student A[100];
 cout<<"请输入学生数据的个数:"<<endl;
 cin>>count;
  cout<<"请输入学生信息"<<endl;
  for(a=0;a<count;a++)
  { A[a].student1();}
  A[a].ave1();
  A[a].ave2();
  A[a].ave3();
  student::disp();
  return 0;}

  错误提示：Debug/学生成绩.exe : fatal error LNK1120: 1 unresolved externals