#include<iostream.h>
#include<string.h>
#include<fstream.h>
class student
{protected:
int number,age,ban;char name[30],sex[30];double match,chinese,english,total,sum;
public:
student(){}
student(char na[30],char s[30],double ma,double chin,double eng,int a,int b,int num)
{
strcpy(name,na);
strcpy(sex,s);
match=ma;
chinese=chin;
english=eng;
age= a;
ban=b;
number=num;
}
double getsum()
{
sum=match+chinese+english;
return sum;
}
friend void main(); //定义友员主函数
};
void main() //主函数
{
cout<<"**********欢迎使用次学生成绩管理系统**********"<<endl;
cout<<"请选择您需要的操作！"<<endl;
cout<<"操作："<<endl;
cout<<"(0)数据录入"<<endl;
cout<<"(1)增加人员"<<endl;
cout<<"(2)删除人员"<<endl;
cout<<"(3)修改数据"<<endl;
cout<<"查询："<<endl;
cout<<"(4)按总成绩查询"<<endl;
cout<<"(5)按姓名查询"<<endl;
cout<<"(6)输出所有学生的数据"<<endl;
cout<<"成绩名词"<<endl;
cout<<"(7)按总分查询排名"<<endl;
cout<<"(8)统计数学成绩"<<endl;
cout<<"(9)统计语文成绩"<<endl;
cout<<"(e)统计英语成绩"<<endl;
cout<<"(s)退出系统"<<endl;
cout<<"请选择相关操作请输入相对的括号里的数字！"<<endl;
char p;char w; student *s[50]; ofstream *file[50]; int i=0; int j=0;
bool flag2=0;
do
{
cin>>p;
if((p>='0'&&p<='10'))
flag2=1;
else
cout<<"指令错误！请重新输入："<<endl;
}while(flag2==0);
do{
switch(p)
{
case '0': //数据录入
{
char ch; char name[30],sex[30];double math,chinese,english;int age,ban;
int age;
do
{
cout<<"please input ban"<<endl;
cin>>ban;
cout<<"please input age"<<endl;
cin>>age;
cout<<"please input number"<<endl;
cin>>number;
cout<<"please input sex"<<endl;
cin>>sex;
cout<<"please input name"<<endl;
cin>>name;
cout<<"please input math"<<endl;
cin>>math;
cout<<"please input chinese"<<endl;
cin>>chinese;
cout<<"please input english"<<endl;
cin>>english;
file[j]=new ofstream("d:\\lixiao",ios::ate);
*file[j]<<"name="<<name<<"math="<<math<<"chinese="<<chinese<<"english="<<english<<endl;
j++;
s[i]=new student(name,sex, math, chinese, english,age, ban,number);
i++;
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>ch;
flag2=0;
do
{
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
else
flag2=1;
}while(flag2==0);
}while(ch=='y');
break;
}
case '1': //增加数据
{
char name[30],sex[30];int age,ban,number;double math,chinese,english; char ch;
do
{
cout<<"please input ban"<<endl;
cin>>ban;
cout<<"please input age"<<endl;
cin>>age;
cout<<"please input number"<<endl;
cin>>number;
cout<<"please input the addition of name"<<endl;
cin>>name;
cout<<"please input sex"<<endl;
cin>>sex;
cout<<"please input math"<<endl;
cin>>math;
cout<<"please input chinese"<<endl;
cin>>chinese;
cout<<"please input english"<<endl;
cin>>english;
file[j]=new ofstream("d:\\lili",ios::ate);
*file[j]<<"name="<<name<<"math="<<math<<"chinese="<<chinese<<"english="<<english<<endl;
j++;
s[i]=new student(name,sex, math, chinese, english,age, ban,number);
i++;
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>ch;
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
}while(ch=='y');
break;
}
case '2': //删除数据
{
char name[20];bool flag3=0;char ch;
do
{
cout<<"请输入您要删除的学生姓名："<<endl;
cin>>name;
for(int h=0;h<i;h++)
{
if(strcmp(name,s[h]->name)==0)
{
flag3=1;
i--;
do
{
s[h]=s[h+1];
h++;
}while(h<=i);
}
}
if(flag3==0)
cout<<"您要求删除的对象本来就不存在！请检查输入的正确性！";
cout<<"要继续删除吗？(y/n)"<<endl;
cin>>ch;
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
}while(ch=='y');
break;
}
case '3': //修改数据
{
char name[20];double mat,chin,eng;flag2=0; char ch;
do
{
cout<<"请输入您要修改的学生的姓名："<<endl;
cin>>name;
for(int h=0;h<i;h++)
{
if(strcmp(name,s[h]->name)==0)
{
flag2=1;
cout<<"please input match"<<endl;
cin>>mat;
cout<<"please input chinese"<<endl;
cin>>chin;
cout<<"please input english"<<endl;
cin>>eng;
s[h]->match=mat;
s[h]->chinese=chin;
s[h]->english=eng;
cout<<"数据修改成功！";
}
}
if(flag2==0)
{
cout<<"您要修改的学生本来就不存在！请检查重新输入！"<<endl;
}
cout<<"想继续修改吗(y/n)"<<endl;
cin>>ch;
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
}while(ch=='y');
break;
}
case '4': //按总成绩查询
{
double t;char ch;
do
{
int flag1=0;
cout<<"请输入你要查询学生的总成绩"<<endl;
cin>>t;
for(int q=0;q<i;q++)
{
if(s[q]->getsum()==t)
{
flag1=1;
cout<<"您要查询的学生是："<<(*s[q]).name<<endl;
}
}
if(flag1==0)
cout<<"对不起！您要查询的学生不存在！"<<endl;
cout<<"您想继续查询吗?(y/n)"<<endl;
cin>>ch;
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
}
while(ch=='y');
break;
}
case '5': //按姓名查询
{
char n[20];int j=0;char ch;
do
{
int flag=0;
cout<<"请输入你要查询的学生姓名"<<endl;
cin>>n;
for(int j=0;j<i;j++)
{
if(strcmp(n,(*s[j]).name)==0)
{
flag=1;
cout<<"您要查询的学生是："<<(*s[j]).name<<endl;
cout<<(*s[j]).name<<"的总成绩成绩是"<<(*s[j]).getsum()<<endl;
}
}
if(flag==0)
cout<<"对不起!您要查询的学生不存在!"<<endl;
cout<<"您想继续查询吗?(y/n)"<<endl;
cin>>ch;
if(ch!='y'&&ch!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>ch;
}
}
while(ch=='y');
break;
}
case '6': //输出所有学生的数据
{
cout<<"本系统所有学生数据如下："<<endl;
if(i==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！"<<endl;
for(int k=0;k<i;k++)
{
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< "语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->match <<"外语："<<" "<<s[k]->english<<"总分："<<" "<<(*s[k]).getsum() <<endl;
}
break;
}
case '7': //按总成绩排名
{
int t;student b;
cout<<"本系统所有学生排名如下："<<endl;
for(int x=0;x<i-1;x++)
{
t=x;
for(int y=x+1;y<i;y++)
{
if((s[t]->getsum())<(s[y]->getsum()))
t=y;
if(t!=x)
{
b=*s[x]; *s[x]=*s[t]; *s[t]=b;
}
}
}
if(i==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！";
for(int k=0;k<i;k++)
{
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< "语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->match <<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum() <<endl;
}
break;
}
case '8': //统计数学成绩
{
int t=0, b=0;
cout<<"本系统所有学生数学统计如下："<<endl;
for(int x=0;x<i;x++)
{
if((s[t]->match)<60)
t++;
else b++;
}
cout<<"数学不及格人数"<<t<<'\n'<<"数学及格人数"<<b;
if(i==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！";
break;
}
case '9': //统计语文成绩
{
int t=0,b=0;
cout<<"本系统所有学生语文统计如下："<<endl;
for(int x=0;x<i;x++)
{
if((s[t]->chinese)<60)
t++;
else b++;
}
cout<<"语文不及格人数"<<t<<endl;
cout<<"语文及格人数"<<b<<endl;
if(i==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！";
break;
}
case 'e': //统计英语成绩
{
int t=0,b=0;
cout<<"本系统所有学生英语统计如下："<<endl;
for(int x=0;x<i;x++)
{
if((s[t]->english)<60)
t++;
else b++;
}
cout<<"英语不及格人数"<<t<<endl;
cout<<"英语及格人数"<<b<<endl;
if(i==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！";
break;
}
case 's':
return;
}
cout<<"您想继续进行其他操作吗?(y/n)"<<endl;
bool flag4=0;
do
{
cin>>w;
if(w!='y'&&w!='n')
cout<<"指令错误！请重新输入！"<<endl;
else
flag4=1;
}while(flag4==0);
if(w=='y')
cout<<"请输入操作代码(0 录入/1 增加人员/2 删除人员/3 修改数据/4 按总分查询/5 按姓名查询/6 显示所有成员数据/7 按总分排名/8 统计数学成绩/9统计语文成绩/e统计英语成绩/s退出)"<<endl;
cin>>p;
}while(w=='y');
}
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