c++学生成绩信息系统

c++编写学生成绩管理系统如何添加成绩~

这个需要用到文件，你可以看看文件那部分

#include #include #include using namespace std;typedef struct student {unsigned m_id;string m_name;unsigned m_age;string m_sex;string m_address;string m_contact;string m_dormitory;struct student *m_next;}student;class CStudent {private :student *head;public :CStudent() {head = new student;head->m_id = 0;head->m_name = "noname";head->m_next = NULL;}~CStudent() {student *p = head,*q;while(p) {q = p;p = q->m_next;delete q;}}student readdata(int model); // model = 1:不读取学号，2:不读取姓名，其他，读取所有信息void entering();bool insert(const student &astu);student *findid(unsigned id) const;student *findname(const string &name) const;student *findsex(const string &sex) const;student *finddormitory(const string &dormitory) const;unsigned boys() const;unsigned girls() const;unsigned headcount() const;bool eraseid();bool erasename();bool modifyid();bool modifyname();void Show() const;void query() const;void friend statistics(const CStudent &aclss);void friend erase(CStudent &aclss);void friend modify(CStudent &aclss);};string readstring() {string str;while(cin.get() != '
');cin >> str;return str;}student CStudent::readdata(int model) {student tmp;if(model != 1) { cout > tmp.m_id; }if(model != 2) { cout > tmp.m_age;cout > tmp.m_id;while(tmp.m_id) {if(findid(tmp.m_id) == NULL) {cout > tmp.m_age;cout > tmp.m_id;}}student *CStudent::findid(unsigned id) const {student *p;for(p = head; p->m_next; p = p->m_next)if(p->m_next->m_id == id) return p;return NULL;}student *CStudent::findname(const string &name) const {student *p;for(p = head; p->m_next; p = p->m_next)if(p->m_next->m_name == name) return p;return NULL;}student *CStudent::findsex(const string &sex) const {student *p;for(p = head; p->m_next; p = p->m_next)if(p->m_next->m_sex == sex) return p;return NULL;}student *CStudent::finddormitory(const string &dormitory) const {student *p;for(p = head; p->m_next; p = p->m_next)if(p->m_next->m_dormitory == dormitory) return p;return NULL;}bool CStudent::insert(const student &astu) {student *newnode,*p = head;if(p->m_next == NULL) {p->m_next = new student(astu);p->m_next->m_next = NULL;return true;}while(p->m_next) {if(p->m_next->m_id == astu.m_id) {cout m_next->m_id > astu.m_id) {newnode = new student(astu);newnode->m_next = p->m_next;p->m_next = newnode;return true;}p = p->m_next;}p->m_next = new student(astu);p->m_next->m_next = NULL;return true;}unsigned CStudent::boys() const {unsigned cnt = 0;student *p;for(p = head->m_next; p; p = p->m_next)if(p->m_sex == "男") ++cnt;return cnt;}unsigned CStudent::girls() const {unsigned cnt = 0;student *p;for(p = head->m_next; p; p = p->m_next)if(p->m_sex == "女") ++cnt;return cnt;}unsigned CStudent::headcount() const {unsigned cnt = 0;student *p;for(p = head->m_next; p; p = p->m_next,++cnt);return cnt;}bool CStudent::eraseid() {student *q,*p;unsigned id;cout > id;p = findid(id);if(p == NULL) {cout m_next;p->m_next = q->m_next;delete q;return true;}bool CStudent::erasename() {student *q,*p;string name;cout m_next;p->m_next = q->m_next;delete q;return true;}bool CStudent::modifyid() {student tmp,*p;unsigned id;cout > id;p = findid(id);if(p == NULL) {cout > choice;}while(choice 7);return choice;}void show(student *p) {cout m_id m_name m_age m_sex m_address m_contact m_dormitory m_next; p; p = p->m_next) show(p);cout > select;switch(select) {case 1 : cout > id;if(p = findid(id)) show(p->m_next);break;case 2 : cout m_next);break;case 0 : return;default : cout > select;switch(select) {case 1 : cout > id;if(p = a.findid(id)) {q = p->m_next;p->m_next = q->m_next;delete q;cout m_next;p->m_next = q->m_next;delete q;cout > select;switch(select) {case 1 : if(a.modifyid()) cout << "修改成功。
"; break;case 2 : if(a.modifyname()) cout << "修改成功。
"; break;case 0 : return;default : cout << "选择错误。
";}system("pause");}int main() {CStudent a;int an;do {an = menu();switch(an) {case 1 : a.entering(); break;case 2 : a.Show(); break;case 3 : a.query(); break;case 4 : a.entering(); break;case 5 : statistics(a); break;case 6 : erase(a); break;case 7 : modify(a); break;case 0 : break;default : cout << "选择错误。
"; break;}}while(an);return 0;}

你可以参考这个
#include<iostream.h>
#include<string.h>
#include<fstream.h>
class stu
{
char name[20];
double math,chinese,english,average,sum;
public:
stu()
{
}
stu(char n[20],double ma,double chin,double eng)
{
strcpy(name,n);
math=ma;
chinese=chin;
english=eng;
}
double getsum()
{
sum=chinese+english+math;
return sum;
}
double getaver()
{
average=getsum()/3;
return average;
}
friend void main();
};

void main()
{
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)按语文查询排名"<<endl;
cout<<"(9)按数学查询排名"<<endl;
cout<<"(y)按英语查询排名"<<endl;
cout<<"选择相关操作请输入相对的括号里的阿拉伯数字！"<<endl;
char p;char w;
stu *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':
{
char c;
char name[20];double math,chinese,english;
do{
cout<<"请输入姓名"<<endl;
cin>>name;
cout<<"请输入数学成绩："<<endl;
cin>>math;
cout<<"请输入语文成绩："<<endl;
cin>>chinese;
cout<<"请输入外语成绩："<<endl;
cin>>english;
file[j]=new ofstream("d:\\document",ios::ate);
*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"语文成绩"<<chinese<<"外语成绩"<<english<<endl;
j++;
s[i]=new stu(name, math, chinese, english);
i++;
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>c;
flag2=0;
do
{
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
else
flag2=1;
}while(flag2==0);
}while(c=='y');
break;
}
case '4':
{
double t;char c;
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>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}
while(c=='y');
break;
}

case '5':
{
char n[20];int j=0;char c;
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<<"平均成绩是："<<(*s[j]).getaver()<<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>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}
while(c=='y');
break;
}
case '1':
{
char name[20];double math,chinese,english;
char c;
do
{
cout<<"请输入您要增加的学生的姓名："<<endl;
cin>>name;
cout<<"请输入数学成绩："<<endl;
cin>>math;
cout<<"请输入语文成绩："<<endl;
cin>>chinese;
cout<<"请输入外语成绩："<<endl;
cin>>english;
file[j]=new ofstream("d:\\document",ios::ate);
*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"语文成绩"<<chinese<<"外语成绩"<<english<<endl;
j++;
s[i]=new stu(name, math, chinese, english);
i++;
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
break;
}
case '2':
{
char name[20];bool flag3=0;char c;
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>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
break;
}
case '3':
{
char name[20];double mat,chin,eng;flag2=0;
char c;
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<<"请输入新的数学成绩："<<endl;
cin>>mat;
cout<<"请输入新的语文成绩："<<endl;
cin>>chin;
cout<<"请输入新的外语成绩："<<endl;
cin>>eng;
s[h]->chinese=chin;
s[h]->math=mat;
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>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
break;
}

case '6':
{
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]->math
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<(*s[k]).getsum()
<<"平均分："<<" "<<(*s[k]).getaver()<<endl;
}
break;
}
case '7':
{
int t;stu b;

cout<<"本系统所以学生排名如下："<<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]->math
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum()
<<"平均分："<<" "<<s[k]->getaver()<<endl;
}
break;
}
case '8':
{
int t;stu b;

cout<<"本系统所以学生语文排名如下："<<endl;
for(int x=0;x<i-1;x++)
{
t=x;
for(int y=x+1;y<i;y++)
{
if((s[t]->chinese)<(s[y]->chinese))
t=y;
if(t!=x)
{
b=*s[t];
*s[t]=*s[x];
*s[x]=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]->math
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum()
<<"平均分："<<" "<<s[k]->getaver()<<endl;
}
break;
}
case '9':
{
int t;stu b;

cout<<"本系统所以学生数学排名如下："<<endl;
for(int x=0;x<i-1;x++)
{
t=x;
for(int y=x+1;y<i;y++)
{
if((s[t]->math)<(s[y]->math))
t=y;
if(t!=x)
{
b=*s[t];
*s[t]=*s[x];
*s[x]=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]->math
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum()
<<"平均分："<<" "<<s[k]->getaver()<<endl;
}
break;
}
case 'y':
{
int t;stu b;

cout<<"本系统所以学生英语排名如下："<<endl;
for(int x=0;x<i-1;x++)
{
t=x;
for(int y=x+1;y<i;y++)
{
if((s[t]->english)<(s[y]->english))
t=y;
if(t!=x)
{
b=*s[t];
*s[t]=*s[x];
*s[x]=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]->math
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum()
<<"平均分："<<" "<<s[k]->getaver()<<endl;
}
}
break;
}

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/4 按总分查询/5 按姓名查询/1 增加人员/2 删除人员/3 修改数据/6 显示所有成员数据/7 按总分排名/8 按语文排名/9按数学排名/y按英语排名)"<<endl;
cin>>p;
}while(w=='y');
for(int x=0;x<i;x++)
{
delete s[x];
cout<<"delete all members!"<<endl;
}

}

---

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