#include<iostream>
#include<math.h>
#include<string>
#include<fstream>

using namespace std;

static int n=0;

class exam  //成绩类
{
public:
float Math;
float English;
float Sport;
float mo;
};

class final:public exam
{
public:
float chengji(float a=0,float b=0,float c=0);
};


float final::chengji(float a,float b,float c)
{
mo=a+b+c;
return a+b+c;
}

class student //学生类
{
public:
float pingding();
public:
string name;             //姓名
string number;           //学号
char sex[5];           //性别
int money;              //奖学金数额
float GPA;              //学分绩
final mo;                //期末考试成绩
};

float student::pingding()
{
float GPA;
GPA=(mo.Math*4+mo.English*3+mo.Sport*2)/9;
if(GPA>=8)
money=1000;
else if(GPA>=7&&GPA<8)
money=500;
else if(GPA>=6&&GPA<7)
money=300;
else if(GPA<6&&GPA>=5)
money=150;
else
money=0;
return GPA;;
}

class guanli
{
public:
void print();
int gameprint1();
void fun1(student *stu);
void paihang(student *stu);
void find(student *stu);
void chushi(student *stu);
};

void guanli::print()                   
{
cout<<"┃------------------------------------┃"<<endl;
cout<<"┃*********    奖学金评定    *********┃"<<endl;
cout<<"┃*********  1选择学生信息   *********┃"<<endl;
cout<<"┃*********  2查看奖学金信息 *********┃"<<endl;
cout<<"┃*********  3查询个人奖学金 *********┃"<<endl;
cout<<"┃*********  4退出           *********┃"<<endl;
cout<<"┃------------------------------------┃"<<endl;
}

int guanli::gameprint1()       
{
int a;
cout<<"继续操作请按1，退出请按0"<<endl;
cin>>a;
return a;
}

void guanli::chushi(student *stu)     //初始化学生信息函数
{
ifstream p;
int i;

if(!p)
{
cout<<"打开失败"<<endl;
exit(0);
}
while(!p.eof())
{
p>>stu[n].name>>stu[n].number>>stu[n].sex>>stu[n].mo.Math>>stu[n].mo.English>>stu[n].mo.Sport;
n++;
}
for(i=0;i<n;i++)
stu[i].pingding();
p.close();
}

void guanli::fun1(student *stu)       //录入学生信息函数
{
float a,b,c; 
cout<<"输入学生姓名，学号，性别"<<endl;
cin>>stu[n].name>>stu[n].number>>stu[n].sex;
cout<<"请选择输入"<<stu[n].name<<"的成绩"<<endl;


cout<<"请输入该生期末考试成绩--请按--数学 英语 的顺序输入，否则默认为0"<<endl;
cin>>a>>b>>c;
stu[n].mo.Math=a;
stu[n].mo.English=b;
stu[n].mo.Sport=c;
stu[n].mo.chengji(a,b,c);
ofstream p;
p.open("E:\\1.txt",ios::app);
if(!p)
{
cout<<"打开失败"<<endl;
exit(0);
}
p<<endl<<stu[n].name<<" "<<stu[n].number<<" "<<stu[n].sex<<stu[n].mo.Math<<" "<<stu[n].mo.English<<" "<<stu[n].mo.Sport<<" " ;
n++;
}

void guanli::paihang(student *stu)     //查看奖学金信息函数
{
int i;
cout<<"姓名"<<" "<<"学分绩"<<"  "<<"奖学金数额"<<endl;
for(i=0;i<n;i++)
{
stu[i].pingding();
cout<<stu[i].name<<" "<<stu[i].GPA<<" "<<stu[i].money<<endl;
}
}

void guanli::find(student *stu)   //查询奖学金函数
{
float b;
cout<<"请输入所查询学生学号"<<endl;
string ch;
cin>>ch;
int i;
for(i=0;i<n;i++)
{
if(ch==stu[i].number)
{
b=stu[i].pingding();
if(b>=6&&b<7)
cout<<"恭喜"<<stu[i].name<<"获得综合三等奖学金，数额为300"<<endl;
else if(b>=5&&b<6)
cout<<"恭喜"<<stu[i].name<<"获得单项奖学金，数额为150"<<endl;
else if(b>=7&&b<8)
cout<<"恭喜"<<stu[i].name<<"获得综合二等奖学金，数额为500"<<endl;
else if(b>=8)
cout<<"恭喜"<<stu[i].name<<"获得综合一等奖学金，数额为1000"<<endl;
else
cout<<"该生未获得奖学金，请继续努力"<<endl;
return ;
}
}
cout<<"查无此人"<<endl;
}



void main() 
{
student stu[100],*CH;
guanli a;
CH=stu;
a.chushi(stu);
int i,lin;
loop1: a.print();
cin>>i;
if(i!=1&&i!=2&&i!=3&&i!=4&&i!=5)
{
cout<<"输入错误，请重新输入"<<endl;
goto loop1;
}
else
{
switch(i)
{
case 1:
a.fun1(CH);           
lin=a.gameprint1();
if(lin==1)
goto loop1;
else exit(0);
case 2:
a.paihang(CH);
lin=a.gameprint1();
if(lin==1)
goto loop1;
else exit(0);
case 3:
a.find(CH);
lin=a.gameprint1();
if(lin==1)
goto loop1;
else exit(0);

case 4: exit(0);}}}

为什么学分绩表达不出来？先谢谢各位大神了