学生信息登记表，链表实现

#include <iostream>
#include <windows.h>
#include <bits/stdc++.h>
using namespace std;
typedef struct student
{
    
    
   long int num;//学号
    char name[20];//姓名
    int foxscore;//fox成绩
    int cscore;//C语言
    int englishscore;//英语成绩
    int allscore;//总成绩
    struct student *next;
}stu,*st;

void goxy(int x,int y)
{
    
    

HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD pos = {
    
     0 };
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(handle, pos);
}
void setcolor(unsigned short ForeColor,unsigned short BackGroundColor)
{
    
    
HANDLE handle=GetStdHandle(STD_OUTPUT_HANDLE);
SetConsoleTextAttribute(handle,ForeColor+BackGroundColor*0x10);
}
void caidan()
{
    
    

    goxy(30,10);
    printf("************************************");
     goxy(30,12);
    printf("欢迎进入学生成绩小程序");
    goxy(30,14);
    printf("************************************");
    goxy(30,16);
    printf("请选择");
    goxy(30,18);
    printf("1.输入4个学生的信息 2.3门课程总分 3.总分降序显示出来 4.根据学号显示出该学生的信息");
     goxy(30,20);
    printf("5.退出");
    goxy(30,22);
}
 void getinformation(st &head){
    
    
 st qhead;
 qhead=head;
 for(int i=1;i<5;i++){
    
    
    st p=new stu;
    p->next=NULL;
     cin>>p->num>>p->name>>p->foxscore>>p->cscore>>p->englishscore;
     p->allscore=p->cscore+p->foxscore+p->englishscore;
      qhead->next=p;
      qhead=p;
 }
 }
 void printfallscore(st head){
    
    
     st p=head->next;
     cout<<"4名同学的总成绩如下"<<endl;
     while(p){
    
    
     cout<<p->name<<" "<<p->allscore<<endl;
     p=p->next;
     }
 }

 st charu(st head,st &q){
    
    
     st p1,p2;
     p1=head;
     p2=head->next;

    while(p2!=NULL){
    
    
     if(q->allscore<p2->allscore){
    
    
     p1=p1->next;
     p2=p2->next;
     }else break;
    }
    p1->next=q;
    q->next=p2;

   return head;

 }
 st mysort(st head){
    
    
      st p1,q,t;
     p1=head;

    q=head->next->next;
    p1->next->next=NULL;

    t=q->next;

  while(q!=NULL){
    
    
  p1=charu(p1,q);
  q=t;
  if(t!=NULL)
  t=q->next;
  }
 return p1;

 }
 void searchnum(st head){
    
    
     cout<<"请输入要查找的学号"<<endl;
     int x,y=0;
     cin>>x;
     st p;
     p=head->next;
     while(p){
    
    
     if(p->num==x){
    
    
        cout<<p->num<<" "<<p->name<<" "<<p->foxscore<<" "<<p->cscore<<" "<<p->englishscore;
        y=1;
        break;
     }
     p=p->next;
     }
     if(y==0) cout<<"没有要找的学号"<<endl;

 }
int main()
{
    
    
    st head=new stu;
    head->next=NULL;
    //cout << "对4个学生的信息进行输入；" << endl;
    //getinformation(head);//1 a 10 20 30 2 b 20 30 40 3 c 45 50 60 4 d 70 80 90




    setcolor(7,2);
    system("cls");

     int i,flag=0;
    t:caidan();
   scanf("%d",&i);
    switch (i){
    
    
    case 1:system("cls");
    cout<<"对4个学生的信息进行输入；例如 1 a 10 20 30 2 b 20 30 40 3 c 45 50 60 4 d 70 80 90"<<endl;
    getinformation(head);//1 a 10 20 30 2 b 20 30 40 3 c 45 50 60 4 d 70 80 90//10 fu 99 100 100 15 zhao  80 70 60 20 qian 15 25 35 30 wang 55 56 57
    flag=1;
    system("pause");system("cls");goto t; break;
    case 2:
    if(flag==0){
    
    
    cout<<"请先选择1，建立学生信息后再操作"<<endl;
    system("pause");
    system("cls");
    goto t;
    }
    system("cls");
      cout<<"显示学生3门课程总分"<<endl;
     printfallscore(head);
    system("pause");system("cls");goto t;break;
    case 3:
    if(flag==0){
    
    
    cout<<"请先选择1，建立学生信息后再操作"<<endl;
    system("pause");
    system("cls");
    goto t;
    }
    system("cls");
    cout<<"对4个学生的总分按降序排序并显示出来"<<endl;
    head=mysort(head);
    printfallscore(head);
    system("pause");system("cls");goto t;break;
    case 4:
    if(flag==0){
    
    
    cout<<"请先选择1，建立学生信息后再操作"<<endl;
    system("pause");
    system("cls");
    goto t;
    }
    cout<<"输入一个学号，显示出该学生的有关信息"<<endl;
    searchnum(head);
    system("pause");system("cls");goto t;break;
    case 5:exit(1);break;
    default:system("cls");goto t;
    }


    return 0;
}