#include <iostream.h>
#include <string.h>
class Student
{
private :
char name [20];
char id[8];
int score[5];
public:
Sudent (char *iid="",char *s="")
{
strcpy(id,iid);
strcpy(name,s);};
float GetAvg();
float GetMax();
void Print();
friend istream& operator >>(istream& istr,Student&);
};

istream& operator>>(istream& istr,Student& c)

{ cout<<"请输入学号" <<endl;
cin>>c.id<<endl;
cout<<"请输入姓名" <<endl;
cin>>c.name;
for (int i=0;i<5;i++)
{
cout<<"请输入学生5门可的成绩"; cin<<c.score[i]<<endl;
}
return istr;
}

float Student:: GetAvg()
{
flaot avg=0.0;
for (int i=0,i<5,i++)
{
avg+=scr[i];
}
reutrn avg/5.0;
}
float Student::GetMax()
{int max=0;
for(int i=0;i<5;i++)
if(max<scr[i])
{
max=scr[i];

}

return max;
}
void Student::Print()
{
cout<<"学生的学号是："<<id<<endl;
cout<<"学生的姓名是："<<name<<endl;
for (int i=0;i<5;i++)
{cout<<str[i];}
}
viod main()
{
Student c
cin>>c;
c.print();
cout<<"平均成绩："<<c.GetAvg()<<endl;
cout<<"最高成绩："<<c.GetMax()<<endl;
}

帮忙修改下啊

你这程序从那弄来的
有很多是拼写错误
自己回去好好查吧

#include <iostream.h>
#include <string.h>
class Student
{
private :
char name [20];
char id[8];
int score[5];
public:
Sudent (char *iid="",char *s="")
{
strcpy(id,iid);
strcpy(name,s);};
float GetAvg();
float GetMax();
void Print();
friend istream& operator >>(istream& istr,Student&);
};

istream& operator>>(istream& istr,Student& c)

{ cout<<"请输入学号" <<endl;
cin>>c.id<<endl; //错
cout<<"请输入姓名" <<endl;
cin>>c.name;
for (int i=0;i<5;i++)
{
cout<<"请输入学生5门可的成绩"; cin<<c.score[i]<<endl;//错
}
return istr;
}

float Student:: GetAvg()
{
flaot avg=0.0;
for (int i=0,i<5,i++)
{
avg+=scr[i]; //没定义，应该是score[i]
}
reutrn avg/5.0;
}
float Student::GetMax()
{int max=0;
for(int i=0;i<5;i++)
if(max<scr[i])
{
max=scr[i];

}

return max; //返回值不符合定义float
}
void Student::Print()
{
cout<<"学生的学号是："<<id<<endl;
cout<<"学生的姓名是："<<name<<endl;
for (int i=0;i<5;i++)
{cout<<str[i];} //没定义
}
viod main()
{
Student c //连分号都少！！
cin>>c;
c.print(); //前面定义的Print，P是大写！！！
cout<<"平均成绩："<<c.GetAvg()<<endl;
cout<<"最高成绩："<<c.GetMax()<<endl;
}

我只指出一点
还有很多这样的错误，
你真应该好好去看书

这是我把里面显而易见的错误修改后的程序

#include <iostream.h>
#include <string.h>
class Student
{
private :
char name [20];
char id[8];
int score[5];
public:
void Sudent (char *iid,char *s)
{
strcpy(id,iid);
strcpy(name,s);
};
float GetAvg();
int GetMax();
void Print();
friend istream& operator >>(istream& istr,Student&);
};

istream& operator>>(istream& istr,Student& c)
{
cout<<"请输入学号" <<endl;
cin>>c.id;
cout<<"请输入姓名" <<endl;
cin>>c.name;
for (int i=0;i<5;i++)
{
cout<<"请输入学生5门可的成绩";
cin>>c.score[i];
}
return istr;
}

float Student:: GetAvg()
{
float avg=0.0f;
for (int i=0;i<5;i++)
{
avg+=score[i];
}
return float(avg/5.0);
}

int Student::GetMax()
{
int max=0;
for(int i=0;i<5;i++)
if(max<score[i])
{
max=score[i];
}

return max;
}
void Student::Print()
{
cout<<"学生的学号是："<<id<<endl;
cout<<"学生的姓名是："<<name<<endl;
for (int i=0;i<5;i++)
{cout<<score[i];}
}
int main()
{
Student c;
cin>>c;
c.Print();
cout<<"平均成绩："<<c.GetAvg()<<endl;
cout<<"最高成绩："<<c.GetMax()<<endl;
return 0;
}

多谢指点