C++打造學生管理系統，直接上源碼

這次帶來的是學生管理系統的實例

話不多說，直接上源碼吧！

#include<iostream> #include<string> #include<iomanip> using namespace std; int num; //總學生人數 class student { friend class studentMessage; private: string ID; string name; double score[5]; //1-4代表math、English、OPP和總成績，0號單元空出 student * next; public: student(); string getName(){return name;} string getID(){return ID;} double getMath(){return score[1];} double getEnglesh(){return score[2];} double getOPP(){return score[3];} double gettotol(){return score[4];} student* getNext(){return next;} static void analyse(int ,student * ); //分析成績 void display(); //列印成績 void swap(); //交換對象和對象->next的信息 }; student::student() { cout<<"請輸入學生學號 : ";cin>>ID; cout<<"請輸入學生姓名 : ";cin>>name; cout<<"請輸入學生的數學、英語和OPP成績 : "<<endl; int a,b,c; cin>>a; while(a<0||a>100) { cout<<"輸入成績有誤，請重新輸入: "<<endl; cin>>a; } cin>>b; while(b<0||b>100) { cout<<"輸入成績有誤，請重新輸入: "<<endl; cin>>b; } cin>>c; while(c<0||c>100) { cout<<"輸入成績有誤，請重新輸入: "<<endl; cin>>c; } score[1]=a; score[2]=b; score[3]=c; score[4]=a+b+c; next=NULL; } void student::analyse(int a,student * first) { int you=0,liang=0,zhong=0,jige=0,bujige=0; student * t=first; double average=0; //平均分 while(t) { int b = int(t->score[a]/10); switch(b) { case 10: case 9:you++;break; case 8:liang++;break; case 7:zhong++;break; case 6:jige++;break; default:bujige++; } average+=t->score[a]; t=t->next; } average=average/num; cout<<" 考生總人數 : "<<num<<" 平均分 : "<<average<<endl; cout<<" 優良中及格不及格 "<<endl; cout<<" "<<you<<" "<<liang<<" "<<zhong<<" "<<jige<<" "<<bujige<<endl; } void student::display() { cout<<" "<<setw(3)<<ID<<" "<<setw(3)<<name<<" "; for (int i=1;i<=4;i++) { cout<<setw(3)<<score[i]<<" "; } cout<<endl; } void student::swap() { int j; string na,id; double sco[5]; na=name;name=next->name;next->name=na; id=ID;ID=next->ID;next->ID=id; for(j=1;j<=4;j++) { sco[j]=score[j]; score[j]=next->score[j]; next->score[j]=sco[j]; } } class studentMessage{ private: student * first; student * last; public: studentMessage(); student* getFirst(){return first;} student* getLast(){return last;} int getNum(){return num;} void add(); //向表中增加學生成績記錄 void search(); //在表中查找學生成績記錄 void del(); //在表中刪除學生成績記錄 void showOne(); //分析一門課的成績 void showAll(); //輸出所有同學所有科目的成績 void sort(); //按一門課成績或總成績排序 void clear(); //清空所有信息並退出系統 }; studentMessage::studentMessage() { first=NULL; last=NULL; num=0; } void studentMessage::add() { student * t =new student; student *p = first; while(p){ if(p->ID==t->ID) { cout<<" 學號輸入錯誤或該學生成績已經存在！(如需修改，請先刪除再重新錄入)"<<endl; return; } p=p->next; } num++; if(first==NULL) { first=last=t;

}
else
{
last->next=t;
last=last->next;
}
}
void studentMessage::search()
{
string a;
cout<<"
請輸入要查找的學生的學號:";cin>>a;
student *t = first;
while(t){
if(t->ID==a)
break;
t=t->next;
}
if(!t)
{
cout<<"
未找到要查找學生！"<<endl;
return;
}
cout<<"
查找成功！"<<endl;
cout << " 學號姓名數學英語 OPP 總成績" << endl;
t->display();
}
void studentMessage::del()
{
string a;
cout<<"
請輸入要刪除的學生的學號: ";cin>>a;
student *t = first;
student *p=NULL;
while(t){
if(t->ID==a)
break;
p=t;
t=t->next;
}
if(!t)
{
cout<<"
未找到要刪除學生！"<<endl;
return;
}
if(!p)
{
first=first->next;
cout<<"
成功刪除學生"<<a<<endl;
delete t;
}
else
{
p->next=t->next;
cout<<"成功刪除學生"<<a<<endl;
delete t;
}

num--;
}
void studentMessage::showOne()
{
int a;
while(1)
{
cout<<"
想要分析哪一門成績？請輸入相應序號(1:math 2:English 3:OPP): ";cin>>a;
if(a!=1&&a!=2&&a!=3)
cout<<"
輸入序號有誤，請重新輸入！"<<endl;
else
break;
}
cout<<"
成績分析如下:
"<<endl;
student::analyse(a,first);
}
void studentMessage::showAll()
{
cout << "---------------------成績列表----------------------"<< endl;
cout << " 學號姓名數學英語 OPP 總成績" << endl;
student *t = first;
while(t){
t->display();
t=t->next;
}
}
void studentMessage::sort()
{
int a,n=0; //n--排名
cout<<"想要按照什麼成績排序？請輸入相應序號(1.數學 2.英語 3.OPP 4.總成績): ";
while(1)
{
cin>>a;
if (a!=1&&a!=2&&a!=3&&a!=4)
cout<<"
輸入序號有誤，請重新輸入 : ";
else
break;
}
student *t=first;
student *p=t;
while(p->next)
{
t=first;
while(t->next)
{
if(t->next->score[a]>=t->score[a])
{
t->swap();
}
t=t->next;
}
p=p->next;
}
t = first;
cout<<"
成績表如下: "<<endl;
cout<<"學號姓名成績排名"<<endl;
while(t){
n++;
cout<<" "<<t->getID()<<" "<<t->getName()<<" ";
switch(a)
{
case 1 :cout<<t->getMath()<<" "<<n<<endl;break;
case 2 :cout<<t->getEnglesh()<<" "<<n<<endl;break;
case 3 :cout<<t->getOPP()<<" "<<n<<endl;break;
case 4 :cout<<t->gettotol()<<" "<<n<<endl;break;
}
t=t->next;
}
}
void studentMessage::clear()
{
int x;
cout<<"確認要清空所有信息？請輸入1或2 (1:確認 2:取消) : ";cin>>x;
if (x==2)
{
cout<<"
取消清空
"<<endl;
return;
}
student *t = first;
student *p;
while(t){
p=t;
t=t->next;
delete p;
}
cout<<"
清空成功！
";
cout<<"退出成功！
";
}
void showMenu()
{
cout << "
";
cout << "===============================
";
cout << " 學生成績管理系統

";
cout << " 1.顯示所有學生成績
";
cout << " 2.添加信息
";
cout << " 3.查詢信息
";
cout << " 4.刪除信息
";
cout << " 5.成績排序
";
cout << " 6.單科成績分析
";
cout << " 7.清空所有信息並退出系統
";
cout << " 0.退出系統
";
cout << "===============================
";
cout << "
";
}
int main()
{
int h;
studentMessage stuM=studentMessage();
while(1)
{
showMenu();
cout << "請輸入操作對應的序號 : ";
cin >>h;
cout<<endl;
switch(h)
{
case 1: stuM.showAll(); break;
case 2: stuM.add(); break;
case 3: stuM.search(); break;
case 4: stuM.del(); break;
case 5: stuM.sort(); break;
case 6: stuM.showOne(); break;
case 7: stuM.clear(); return 0;
case 0: cout<<"
退出成功！";return 0;
default:cout<<"
輸入序號有誤！請輸入正確的序號。"<<endl;
}
}
}