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专业: 电气科学与工程

[求助] 有个小麻烦请找出来错误并改过来谢谢

这是学生成绩管理系统  但查询排序和删除功能没有用请完善一下
#include
#include
using namespace std;
// 数据结构
struct guanli
{
   char xuehao[20];
   char xingming[20];
   char sex[20];
   char jiguan[20];
   float c,e,w,zong,pingjun;
   guanli *link;
};

//输入数据
guanli * shuru(int num)
{
   cout << "共需输入 " << num << " 条记录:\n";

      guanli *head,*p,*tail;
      head = new guanli;
      tail = head;
      for(int i=0;i       {
         cout << "\n请输入第 " << i+1 << "条记录:\n";
               p=new guanli;
               cout << "学号: ";
               cin >> p->xuehao;
               cout << "姓名: ";
               cin >> p->xingming;
               cout << "性别: ";
               cin >> p->sex;
               cout << "籍贯: ";
               cin >> p->jiguan;
               cout << "成绩(eg. 20.5 30.5 40): ";
               cin >> p->c >> p->e >> p->w;
               p->link = NULL;

            // 添加节点
               tail->link = p;
               tail = p;
   }

      return head;
}

void jisuanzong(guanli *head)
{
      guanli *p = head->link;

      if(p!=NULL)
      {
               p->zong = p->c + p->e + p->w;//计算总成绩平均成绩
               p->pingjun = p->zong/3.0;// 计算最高成绩
   }
}
//输出最高总成绩
void zuigao(guanli *head)
{
      guanli *p = head->link,*m = head->link;
      while (p)
      {
   if((m->c+m->e+m->w) < (p->c+p->e+p->w)) m = p;
               p=p->link;
   }

      cout << m->xuehao << '\t' << m->xingming << '\t' << m->sex << '\t' << m->jiguan << '\t' <c+m->e+m->w<< endl;
}

//C单科平均成绩
void allc(guanli *head)
{
      guanli *p = head->link;
      float a = 0.0;
      while (p)
      {
               a += p->c;
               p = p->link;
   }
      cout << "C单科平均成绩: " << a << endl;
}

//英语单科平均成绩
void alle(guanli *head)
{
      guanli *p = head->link;
      float a = 0.0;
      while (p)
      {
               a += p->e;
               p = p->link;
   }
      cout << "英语单科平均成绩: " << a << endl;
}

//物理单科平均成绩
void allw(guanli *head)
{
      guanli *p = head->link;
      float a = 0.0;
      while (p)
      {
               a += p->w;
               p = p->link;
   }
      cout << "物理单科平均成绩: " << a << endl;
}

//C最高成绩
void czuigao(guanli *head)
{
      guanli *p = head->link,*m = head->link;
      while (p)
      {
         if (m->c < p->c) m = p;
         p = p->link;
      }
      cout << m->xuehao << '\t' << m->xingming << '\t' << m->c << endl;
}

//英语最高成绩
void ezuigao(guanli *head)
{
      guanli *p = head->link,*m = head->link;
      while (p)
      {
         if (m->e < p->e) m = p;
         p = p->link;
      }
      cout << m->xuehao << '\t' << m->xingming << '\t' << m->e << endl;
}

//物理最高成绩
void wzuigao(guanli *head)
{
      guanli *p = head->link,*m = head->link;
      while (p)
      {
         if (m->w < p->w) m = p;
         p = p->link;
      }
      cout << m->xuehao << '\t' << m->xingming << '\t' << m->w << endl;
}

//用姓名查询
void chaxingming(guanli *head,char *name)
{
      guanli *p = head->link;
      while(p && strcmp(p->xingming,name)!=0) p=p->link;
      if (p) cout << p->xuehao << '\t' << p->xingming << '\t' << p->sex << '\t' << p->jiguan << '\t' << endl;
}

//用学号查询
void chaxuehao(guanli *head,char *id)
{
      guanli *p = head->link;
      while(p!=NULL && strcmp(p->xuehao,id)!=0) p=p->link;
      if (p) cout << p->xuehao << '\t' << p->xingming << '\t' << p->sex << '\t' << p->jiguan << '\t' << endl;
}

// 排序
guanli* paixu(guanli *head)
{
      guanli *p = head->link;
      guanli *q, *tail, *temp;
      while (p && p->link) { tail = p; p = p->link; }

      float y = p->zong, t = 0.0;
      p = head->link;
      for (p = head->link; p && p!=tail; p = p->link)
      {
         for (q = p->link; q; q = q->link)
         {
               if (q->zong > p->zong) { temp = p; p = q; q = temp; }
         }
      }

      return head;
}

// 删除
void shanchu(guanli *head,char *name)
{
      guanli *p = head->link;
      guanli *n = head;
      while (p)
      {
         if (0==strcmp(p->xingming,name))
         {
               n->link = p->link;
               delete p;
         }
         else
         {
               p = p->link;
               n = n->link;
         }
      }
}

// 主函数
void main()
{    int a,b,c,d;char *e,*f,*g;

      cout<<"|---------------------------------------------------------|"<       cout<<"|                   学生成绩管理系统                   |"<       cout<<"|---------------------------------------------------------|"< cout<<"|-输入信息(1)  计算成绩(2)  查询信息(3)  排序(4)  删除(5)-|"< cout<<"|---------------------------------------------------------|"< cout<<"请输入序号进行相应的操作："< cin>>a;
switch(a)
{
case 1:
{
cout<<"输入多少学生的信息(输入个数):";
cin>>b;
            guanli *p;
            p = shuru(b);

      while (p && p->link)
   {
               p = p->link;
               cout << "\n学号: " << p->xuehao
               << "\n姓名: " << p->xingming
               << "\n性别: " << p->sex
               << "\n籍贯: " << p->jiguan
               << "\nC成绩: "<< p->c <<"\tE成绩: " << p->e << "\tW成绩: " << p->w << endl;
   }
}break;

case 2:
{
         cout<<"输入多少学生的信息(输入个数):";
cin>>b;
            guanli *p;
            p = shuru(b);
            jisuanzong(p);

   cout<<"|---------------------------------------------------------------------------|"<    cout<<"|总成绩最高者(1)--C语言成绩最高者(2)--英语成绩最高者(3)--物理成绩最高者(4)--|"<    cout<<"|---------------------------------------------------------------------------|"<    cout<<"输入序号进行相应的操作:";
   cin>>c;
   switch(c)
   {
   case 1:zuigao(p);break;
   case 2:czuigao(p);break;
   case 3:ezuigao(p);break;
   case 4:wzuigao(p);break;
   }
}break;

case 3:
{
            cout<<"输入多少学生的信息(输入个数):";
cin>>b;
            guanli *p;
            p = shuru(b);

            cout<<"|---------------------------------------|"<    cout<<"|    学号查询(1)    姓名查询(2) |"<    cout<<"|---------------------------------------|"<             cout<<"输入序号进行相应的操作:";
   cin>>d;
   switch(d)
   {
   case 1:
   {
   cout<<"要查询学生学号是:";
   cin>>e;
               chaxuehao(p,e);
   }break;

   case 2:
   {
   cout<<"要查询学生名字:";
   cin>>f;
               chaxingming(p,f);
   }break;
   }
}break;
case 4:
{

            cout<<"输入多少学生的信息(输入个数):";
cin>>b;
            guanli *p,*m;
            p = shuru(b);

m=paixu(p);
            cout<<"---------排序(按总成绩)-----------"<             while (m && m->link)
{
               m = m->link;
               cout << "\n学号: " << m->xuehao
               << "\n姓名: " << m->xingming
               << "\n性别: " << m->sex
               << "\n籍贯: " << m->jiguan
               << "\nC成绩: "<< m->c <<"\tE成绩: " << m->e << "\tW成绩: " << m->w << endl;
}
}break;

case 5:
{
cout<<"-------删除(按姓名)--------"<
            cout<<"输入多少学生的信息(输入个数):";
cin>>b;
            guanli *p;
            p = shuru(b);

   cout<<"输入要删除的学生:";
   cin>>g;

shanchu(p,g);
}break;
}
}

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