My C/C ++ path-course 010 (simple example of structured data (Student Score Management ))

I have been busy recently. I haven't written it in a few days. Today, I am working on the application of structured structures (Student Achievement Management). I believe many of my friends have done this. I am ugly here and it is difficult to control C. So there are many not very good functions in it, you can complete it on your own.

 

[Cpp]
# Include <stdio. h>
# Include <stdlib. h>
# Include <string. h>
/**
Simple instance used by struct:
1. Create a Student Score structure (including student ID, name, Chinese, mathematics, and English score)
Use a linked list to direct to the next student (because the number of input students is unknown, the array method is not good)
 
2. Insert, query, change, and delete student scores
*/
Typedef struct Student
{
Char no [4]; // a 3-digit student ID. If multiple student IDs are entered, an error occurs.
Char name [10];
Int chinese;
Int math;
Int english;
Struct Student * next; // point to the next Student
 
} StudentList;
Void init (StudentList *&);
Void select (StudentList *); // query the score
Void insert (StudentList * &); // enter the score
Void update (StudentList * &); // update the score
Void deleteData (StudentList *); // delete data
 
Void studentScoreManege ()
{
StudentList * stuList = NULL;
Int oprate;
Init (stuList); // Initialization
Do {
System ("cls ");
Fflush (stdin );
Puts ("************** Student Data Oprate *******************");
Puts ("* 1. select student score *");
Puts ("* 2. insert student score *");
Puts ("* 3. update student score *");
Puts ("* 4. delete student data *"); // delete All data. Although this is not the case, this is a simple design.
Puts ("* 0. exit *");
Puts ("************************************* ****************");
Printf ("please select a number :");

Scanf ("% d", & oprate );
Switch (oprate) // execute different operations based on different options
{
Case 1:
Select (stuList );
Break;
Case 2:
Insert (stuList );
Break;
Case 3:
Update (stuList );
Break;
Case 4:
DeleteData (stuList );
Break;
Case 0:
Default:
Break;
}
} While (oprate! = 0 );
}
// Initialize the header
Void init (StudentList * & stuList)
{
StuList = (StudentList *) malloc (sizeof (StudentList ));
StuList-> next = NULL;
}
 
// Query the score
Void select (StudentList * stuList)
{
StudentList * p = stuList-> next;
If (p = NULL)
{
Puts ("there is no data, please insert !! ");
Puts ("press any key to return !!! ");
Getchar ();
}
Puts ("*************** student score insert ******************** *");
Puts ("No \ tName \ tChinese \ tMath \ tEnglish ");
While (p! = NULL)
{
Printf ("% s \ t % d \ n", p-> no, p-> name, p-> chinese, p-> math, p-> english );
P = p-> next;
}
Fflush (stdin );
Puts ("press any key to return !!! ");
Getchar ();
}
// Enter the score www.2cto.com
Void insert (StudentList * & stuList)
{
StudentList * p, * s;
P = stuList;
While (p-> next! = NULL)
{
P = p-> next;
}
Do {
S = (StudentList *) malloc (sizeof (StudentList ));

Puts ("please insert student data (NO, Name, Chinese, Math, English ):");
Scanf ("% 3 s % 10 s", & s-> no, & s-> name );
Scanf ("% d", & s-> chinese, & s-> math, & s-> english );
// Determine the validity of the data. Check the repetition of student IDs by yourself.
If (s-> chinese <0 | s-> chinese> 100 | s-> math <0 | s-> math> 100 | s-> english <0 | s-> english> 100)
{
Puts ("input data error !!! ");
Return;
}
S-> next = NULL;
P-> next = s;
P = p-> next; // prepare for the next loop entry
Fflush (stdin); // clear the '\ n' of the buffer; otherwise, the getchar () below does not work.
Puts ("Continue? ENTER to yes or input no to exit "); // whether to continue inputting
} While (getchar () = '\ n ');
 
}
// Update
Void update (StudentList * & stuList)
{
StudentList * p = stuList-> next;
Char no [4]; // a 3-digit student ID. For example, you can enter a 4-digit student ID ~ Student ID. Here, we will handle the cross-border issue by ourselves.
Fflush (stdin); // clear the buffer first
Puts ("please input student No :");
Gets (no );
// Display the student data of the current student ID
If (p = NULL)
{
Puts ("there is no record, please insert !! ");
Puts ("press any key to return !!! ");
Getchar ();
Return;
}
Else
{
While (p! = NULL)
{
If (! Strcmp (p-> no, no) {// if found, it is displayed
Puts ("NO \ tNAME \ tChinese \ tMath \ tEnglish ");
Printf ("% s \ t % d \ n", p-> no, p-> name, p-> chinese, p-> math, p-> english );
Break;
}
Else {
P = p-> next;
}
}
If (p = NULL) // not found
{
Puts ("can't find this student's record !!! ");
Puts ("press any key to return !!! ");
Getchar ();
Return;
}
}
// It can only be updated in this simple way and improved by yourself.
Puts ("please update student data (Name, Chinese, Math, English ):");
Scanf ("% 10 s", & p-> name );
Scanf ("% d", & p-> chinese, & p-> math, & p-> english );
Fflush (stdin );
Puts ("update successful, press any key to return !!! ");
Getchar ();
}
// Delete data
Void deleteData (StudentList * stuList)
{
/* The previous part is similar to the update, but the pointer changes because it needs to be deleted,
For example, a-> B-> c. To delete B, you need a-> c before free (B ),
The operation is a-> next = B-> next
*/
StudentList * p = stuList, * q;
Char no [4]; // a 3-digit student ID. For example, you can enter a 4-digit student ID ~ Student ID. Here, we will handle the cross-border issue by ourselves.
Fflush (stdin); // clear the buffer first
Puts ("please input student No :");
Gets (no );
// Display the student data of the current student ID
If (p-> next = NULL)
{
Puts ("there is no record !!! ");
Puts ("press any key to return !!! ");
Getchar ();
Return;
}
Else
{
While (p-> next! = NULL)
{
If (! Strcmp (p-> next-> no, no) {// displays the result if it is found.
Puts ("NO \ tNAME \ tChinese \ tMath \ tEnglish ");
Printf ("% s \ t % d \ n", p-> next-> no, p-> next-> name, p-> next-> chinese, p-> next-> math, p-> next-> english );
Break;
}
Else {
P = p-> next;
}
}
If (p-> next = NULL) // not found
{
Puts ("can't find this student's record !!! ");
Puts ("press any key to return !!! ");
Getchar ();
Return;
}
}
Puts ("Are you sure delete this record? Press ENTER to confirm or other key to cancel !!! ");
If (getchar () = '\ n') // delete operation. if you do not understand this step, you can delete the google or baidu linked list.
{
Q = p-> next;
P-> next = q-> next;
Free (q); // releases the memory.
}
Puts ("delete successful, press any key to return !!! ");
Getchar ();
}

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