學生成績管理系統

要求是這樣的
1、用c語言編寫一個簡單的學生信息管理程序，能實現對學生信息的簡單管理。
2、具體要求：
建立一個4個學生的信息登記表，每個學生的信息包括：學號，姓名，和3門課程的成績（FOX,C,ENGLISH）。
       程序運行時顯示一個簡單的菜單，例如：
   （1）：信息輸入（INPUT）
   （2）：總分統計（COUNT）
   （3）：總分排序（SORT）
   （4）：查詢(QUERY）
     其中：
     （1）：對4個學生的信息進行輸入；
     （2）：對每個學生的3門課程統計總分；
      (3)：對4個學生的總分按降序排序并顯示出來；
      (4)：查詢輸入一個學號后，顯示出該學生的有關信息；
............
偶先寫了個...
＃i nclude<iostream.h>
＃i nclude<stdlib.h>
struct student
{
 int num;
    char name[20];
 int foxscore;
 int cscore;
 int englishscore;
    struct student *next;
};


void menu()
{
 cout<<"        welecome to my student grade management system"<<endl;
 cout<<"  please follow everyone step in the menu"<<endl;
 cout<<"    1.input information"<<endl;
 cout<<"    2.total scores"<<endl;
 cout<<"    3.sort"<<endl;
 cout<<"    4.query"<<endl;
 cout<<"    ***************************************************"<<endl;
}

struct student *creat(struct student *head) // 函數返回的是與節點相同類型的指針
{
    struct student *p1,*p2;
    p1=p2=(struct student*) malloc(sizeof(struct student)); // 申請新節點
    cin>>p1->num>>p1->name>>p1->foxscore>>p1->cscore>>p1->englishscore; // 輸入節點的值
    p1-> next = NULL; // 將新節點的指針置為空
    while(p1->num>0)
    {
        if (head==NULL) head=p1; //空表，接入表頭
        else p2->next=p1; // 非空表，接到表尾
        p2 = p1;
        p1=(struct student *)malloc(sizeof(struct student)); //申請下一個新節點 
 cin>>p1->num>>p1->name>>p1->foxscore>>p1->cscore>>p1->englishscore; 
 //輸入節點的值
    }
    return head; //返回鏈表的頭指針
}

 

void count(struct student *head)
{
 struct student *temp;
 temp=head; //取得鏈表的頭指針
 while(temp!==NULL)
 {
  int m;
  m=temp->foxscore+temp->cscore+temp->englishscore;
         cout<<m<<endl;//輸出鏈表節點的值
         temp=temp->next; //跟蹤鏈表增長
 }

}
void sort(struct student *head)
{
 struct student *tp;
 tp=head;
 int a[4];//定義總分數組
 int i,j,k;
 while(temp!==NULL)
 {
 a[i]=tp->foxscore+tp->cscore+tp->englishscore;
 tp=tp->next;
 i=i+1;
 }
 for(j=1;j<=3;j++)//冒泡法排序
  for(k=1;k<=4-j;k++)
   if(a[k]<a[k+1])
   {
    int t=a[k];a[k]=a[k+1];a[k+1]=t;
   }
   for(i=1;i<5;i++)
    cout<<a[i]<<endl;

}
void query(struct student *head)
{
 struct student *temper;
 temper=head;
 int number;
 cin>>number;
 for(int i=1;i<=4;i++) 
 {
 if(number==temper->num)
 {
  cout<<"            name is:"<<temper->name<<endl;
  cout<<"       fox score is:"<<temper->foxscore<<endl;
  cout<<"         c score is:"<<temper->cscore<<endl;
  cout<<"   English score is:"<<temper->englishscore<<endl;
  cout<<"        congratulation,syetem have found what you want to search"<<endl;
 } 
 temper=temper->next;
 }
}
void main()
{
 menu();
 cout<<"    firstly,please input information:"<<endl;
 struct student *head;
 head=NULL; /* 建一個空表*/
    head=creat(head); /* 創建單鏈表*/
 cout<<"    secondly,count the total score each student:"<<endl;
 count(head);
 cout<<"    thirdly,sorting the total score:"<<endl;
 sort(head);
 cout<<"    enter num  that you can search each shtudent's information"<<endl;
 query(head);
 cout<<"       thanks you for use my student grade management system"<<endl;
}
編譯時候都沒有錯....
debug輸入時候出現了錯誤....
調試運行后發現原來是while循環出了問題啊
修改后.........
＃i nclude<iostream.h>
＃i nclude<stdlib.h>
struct student
{
 int num;
    char name[20];
 int foxscore;
 int cscore;
 int englishscore;
    struct student *next;
};


void menu()
{
 cout<<"        welecome to my student grade management system"<<endl;
 cout<<"  please follow everyone step in the menu"<<endl;
 cout<<"    1.input information"<<endl;
 cout<<"    2.total scores"<<endl;
 cout<<"    3.sort"<<endl;
 cout<<"    4.query"<<endl;
 cout<<"    ***************************************************"<<endl;
}

struct student *creat(struct student *head) // 函數返回的是與節點相同類型的指針
{
    struct student *p1,*p2;
    p1=p2=(struct student*) malloc(sizeof(struct student)); // 申請新節點
    cin>>p1->num>>p1->name>>p1->foxscore>>p1->cscore>>p1->englishscore; // 輸入節點的值
    p1-> next = NULL; // 將新節點的指針置為空
    for(int i=1;i<=4;i++) 
    {
        if (head==NULL) head=p1; //空表，接入表頭
        else p2->next=p1; // 非空表，接到表尾
        p2 = p1;
        p1=(struct student *)malloc(sizeof(struct student)); //申請下一個新節點
  if(i<=3)
  { 
  cin>>p1->num>>p1->name>>p1->foxscore>>p1->cscore>>p1->englishscore;
  } 
  //輸入節點的值
    }
    return head; //返回鏈表的頭指針
}

 

void count(struct student *head)
{
 struct student *temp;
 temp=head; //取得鏈表的頭指針
    for(int i=1;i<=4;i++) 
    {
  int m;
  m=temp->foxscore+temp->cscore+temp->englishscore;
       cout<<m<<endl;//輸出鏈表節點的值
        temp=temp->next; //跟蹤鏈表增長
 }

}
void sort(struct student *head)
{
 struct student *tp;
 tp=head;
 int a[4];//定義總分數組
 int i,j,k;
 a[1]=tp->foxscore+tp->cscore+tp->englishscore;
 tp=tp->next;
 a[2]=tp->foxscore+tp->cscore+tp->englishscore;
 tp=tp->next;
 a[3]=tp->foxscore+tp->cscore+tp->englishscore;
 tp=tp->next;
 a[4]=tp->foxscore+tp->cscore+tp->englishscore;
 for(j=1;j<=3;j++)//冒泡法排序
  for(k=1;k<=4-j;k++)
   if(a[k]<a[k+1])
   {
    int t=a[k];a[k]=a[k+1];a[k+1]=t;
   }
   for(i=1;i<5;i++)
    cout<<a[i]<<endl;

}
void query(struct student *head)
{
 struct student *temper;
 temper=head;
 int number;
 cin>>number;
 for(int i=1;i<=4;i++) 
 {
 if(number==temper->num)
 {
  cout<<"            name is:"<<temper->name<<endl;
  cout<<"       fox score is:"<<temper->foxscore<<endl;
  cout<<"         c score is:"<<temper->cscore<<endl;
  cout<<"   English score is:"<<temper->englishscore<<endl;
  cout<<"        congratulation,syetem have found what you want to search"<<endl;
 } 
 temper=temper->next;
 }
}
void main()
{
 menu();
 cout<<"    firstly,please input information:"<<endl;
 struct student *head;
 head=NULL; /* 建一個空表*/
    head=creat(head); /* 創建單鏈表*/
 cout<<"    secondly,count the total score each student:"<<endl;
 count(head);
 cout<<"    thirdly,sorting the total score:"<<endl;
 sort(head);
 cout<<"    enter num  that you can search each shtudent's information"<<endl;
 query(head);
 cout<<"       thanks you for use my student grade management system"<<endl;
}