一个C++题

答案：#include<iostream>
 #include<vector>
 #include<string>
 using namespace std;
 class Student
 {
 private:
  string Name;
  int StudentNum;
  
double SQA;
  double Math;
  double Chinese;
  double English;
  double Biology;
  double Geography;
  //数据：学生姓名，学号，平均分数，五门课程的分数
 public:
  Student(string N=" 无",int S=0,double M=0.0,double C=0.0,double E=0.0,double B=0.0,double G=0.0):Name(N),StudentNum(S),Math(M),Chinese(C),English(E),Biology(B),Geography(G){SQA=(M+C+E+B+G)/5;}
  virtual ~Student(){}
  void set_Name(string Na);
  void set_StudentNum(int SN);
  void set_Math(double Ma);
  void set_Chinese(double Ch);
  void set_English(double En);
  void set_Biology(double Bi);
  void set_Geography(double Ge);
  //重新设置数据
  
 int get_StudentNum()const{return StudentNum;}
  double get_SQA()const{return SQA;}
  double get_Math()const{return Math;}
  double get_Chinese()const{return Chinese;}
  double get_English()const{return English;}
  double get_Biology()const{return Biology;}
  double get_Geography()const{return Geography;}
  //返回数据
  
 void printnum()const;//打印数据
  double total_points()const;//五门课总分
 };
 void Student::set_Name(string Na)
 {
  Name=Na;
 }
 void Student::set_StudentNum(int SN)
 {
  StudentNum=SN;
 }
 void Student::set_Math(double Ma)
 {
  Math=Ma;
  SQA=(Math+Chinese+English+Biology+Geography)/5;
 }
 void Student::set_Chinese(double Ch)
 {
  Chinese=Ch;
  SQA=(Math+Chinese+English+Biology+Geography)/5;
 }
 void Student::set_English(double En)
 {
  English=En;
  SQA=(Math+Chinese+English+Biology+Geography)/5;
 }
 void Student::set_Biology(double Bi)
 {
  Biology=Bi;
  SQA=(Math+Chinese+English+Biology+Geography)/5;
 }
 void Student::set_Geography(double Ge)
 {
  Geography=Ge;
  SQA=(Math+Chinese+English+Biology+Geography)/5;
 }
 void Student::printnum()const
 {
  cout<<"姓名："<<Name
   <<" 型号："<<StudentNum
   <<" 数学："<<Math
   <<" 语文："<<Chinese
   <<" 英语："<<English
   <<" 生物："<<Biology
   <<" 地理："<<Geography
   <<" 总分："<<total_points()
   <<" 均分："<<SQA
   <<"\t";
 }
 double Student::total_points()const
 {
  return Math+Chinese+English+Biology+Geography;
 }
  
    void Max(vector<Student> &vec,int Num)
 {
  for(int i=0;i<Num;i++)
   for(int j=Num-1;j>i;j--)
    if( vec[i].get_SQA()<vec[j].get_SQA() )
  
swap(vec[i],vec[j]);
 }//按平均成绩重新排列名次
  
double frist_prize(double a)
 {
  return (a/40)*1.2;
 }//一等奖学金的最低标准
  
double second_prize(double a)
 {
  return (a/40)*1.1;
 }//二等奖学金的最低标准
  
int prize( double ALL_NUM,double MY_SQA )
 {
  if( frist_prize(ALL_NUM)<=MY_SQA )return 1;
  else if( frist_prize(ALL_NUM)>MY_SQA && second_prize(ALL_NUM)<=MY_SQA)return 0;
  else return -1;
 }//判断是否能拿奖学金，能拿几等奖学金
  
void main()
 {
   const int n=40;//40名学生
   Student *p=new Student[n];
   p[0].set_Name("王晓宏");
   p[0].set_StudentNum(20090102);
   p[0].set_Math(125.0);
   p[0].set_Chinese(10.5);
   p[0].set_English(87.5);
   p[0].set_Biology(87.5);
   p[0].set_Geography(88.0);
  
    p[1].set_Name("李明");
   p[1].set_StudentNum(20090103);
   p[1].set_Math(20.0);
   p[1].set_Chinese(22.5);
   p[1].set_English(36.5);
   p[1].set_Biology(27.5);
   p[1].set_Geography(40.0);
  
  p[2].set_Name("张芳");
   p[2].set_

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