# include & ltstdlib.h & gt
# include & ltstring.h & gt
# include & ltmalloc.h & gt
#define INIT_SIZE 10
# Define incr _ SIZE 10
# Define Subject _ Number 3
# Define Lens 3
void show _ Start()；
void show _ Table()；
void add record()；
void Info _ delete()；
void deleteRecord()；
void delete _ Num(int)；
void delete _ Name(char tarName[])；
void Info _ modify()；
void modify record()；
void modify _ Num(int)；
void modify _ Name(char[])；
void Info _ query()；
void query record()；
void query _ Num(int)；
void query _ Name(char[])；
Void display ();
void quit()；
void menu _ CMD()；
Char *subject[SUBJECT_NUM] = {"Gao Dai", "Shu Fen", "C language"};
Structural students
{
int num
char name[20]；
Charming sex;
Floating score [subject _ num];
};
//struct STUDENT stu[LEN+ 1]；
//STUDENT * record =(STUDENT *)malloc(sizeof(STUDENT)* INIT _ SIZE)；
int static stuNum = 0；
//Let's temporarily define three students. ...
Student * record = (student *)malloc(sizeof (student) * init _ size); ;
int main()
{
//record =(STUDENT *)malloc(SIZE of(STUDENT)* INIT _ SIZE)；
//STUDENT * record =(STUDENT *)malloc(sizeof(STUDENT)* INIT _ SIZE)；
/*
Record [1]. num = 100 1；
Strcpy (record [1]). Name, "Jason");
Record [1]. sex = ' M
Record [1]. Score [0] = 85.0;
Record [1]. Score [1] = 90.0;
Record [1]. Score [2] = 95.0;
Record [2]. num = 1002；
Strcpy (record [2]). Name, "Jerry");
Record [2]. sex = ' M
Record [2]. Score [0] = 85.0;
Record [2]. Score [1] = 90.0;
Record [2]. Score [2] = 95.0;
Record [3]. num = 1003；
Strcpy (record [3]). Name, "Jesse");
Record [3]. Gender =' F
Record [3]. Score [0] = 85.0;
Record [3]. Score [1] = 90.0;
Record [3]. Score [2] = 95.0;
*/
/*
info _ modify()；
Int key;
Cout & lt& lt "Please enter your choice:";
CIN & gt； & gt key;
if(key == 1)
{
int targetNum
Cout & lt& lt "Please enter the student ID of the student you want to modify:";
CIN & gt； & gttargetNum
modify _ Num(target Num)；
cout & lt& ltendl
Display ();
}
if(key == 2)
{
char target name[20]；
Cout & lt& lt Please enter the name of the student you want to modify:
CIN & gt； & gttargetName
Modify_Name (target name);
cout & lt& ltendl
Display ();
}
if(key == 3)
{
Exit (0);
}
*/
show _ Start()；
menu _ CMD()；
Returns 0;
}
//It should also be displayed after modification.
void show_Start()
{
//cout & lt； & ltendl
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl
Cout & lt& lt "This is a"
Cout & lt& lt "Student Achievement Management System"
Cout & lt& lt "Student grades can be managed"
Cout & lt& lt "Welcome" < & ltendl
Cout & lt& lt "Made by Jason"<& ltendl
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl
}
//Displays header information, namely: student number, name, gender, senior generation, score and C language.
void show_Table()
{
Cout & lt& lt "student number" <<" \ t "<& lt" name "
Cout & lt& lt" \ t "<& lt theme [0] < & lt" \ t " & lt& ltsubject[ 1]& lt； & lt" \ t "<& lt theme [2];
cout & lt& ltendl
}
void menu_CMD()
{
Int key;
while( 1)
{
Cout & lt& lt" 1. Add student information "
Cout & lt& lt"2. Delete student information "
Cout & lt& lt"3. Modify student information "
Cout & lt& lt"4. Inquire about student information "
Cout & lt& lt"5. Show student information "
Cout & lt& lt"6. Quit "
Cout & lt& lt "Please enter your choice:";
CIN & gt； & gt key;
while( 1)
{
If ((key<1) || (key > 6))
{
Int key;
Cout & lt& lt "You entered it incorrectly, please re-enter!" & lt& ltendl
Cout & lt& lt Please select (1-5):;
CIN & gt； & gt key;
}
other
{
Break;
}
}
Switch (key)
{
Case 1:
add record()；
Break;
Case 2:
deleteRecord()；
Break;
Case 3:
modify record()；
Break;
Case 4:
query record()；
Break;
Case 5:
Display ();
Break;
Case 6:
quit()；
Break;
}
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//Add student information
void addRecord()
{
if(stuNum == 0)
{
Cout & lt& lt "has no record. Now create a new table! " & lt& ltendl
stun um++；
}
other
{
Cout & lt& lt "Now add new information at the end of the current table!" & lt& ltendl
stun um++；
}
//If the array space is insufficient, reapply for space.
if(stuNum & gt； Initialization size)
{
Cout & lt& lt "There is not enough memory space. Now apply for a new memory space!" & lt& ltendl
record =(STUDENT *)realloc(record，(INIT _ SIZE+incr _ SIZE)* sizeof(STUDENT))；
Cout & lt& lt "Space application completed!" & lt& ltendl
}
Cout & lt& lt You want to add a new set of information now, are you sure? & lt& ltendl
Cout & lt& lt "Please enter your choice (Yes/No):";
char choi
CIN & gt； & gt Cui;
if((choi == 'Y')||(choi == 'y '))
{
Cout & lt& lt "Please enter your student number:";
CIN & gt； & gt record [stun]. num
Cout & lt& lt Please enter a name: ";
CIN & gt； & gt record [stun]. Name;
Cout & lt& lt "Please enter gender (m is male and f is female)";
CIN & gt； & gt record [stun]. Sex;
int I；
for(I = 0； I< number of topics; i++)
{
Cout & lt& lt "Please enter"
CIN & gt； & gt record [stun]. Score [I];
}
}
if((choi == 'N')||(choi == 'n '))
{
Cout & lt& lt "Stop adding new student information!" & lt& ltendl
cout & lt& ltendl
}
Cout & lt& lt "already has"
cout & lt& ltendl
}
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//Delete information at night. ...
//Displays the header information of deleteRecord.
void Info_delete()
{
Cout & lt& lt "Please enter a deletion method:"
Cout & lt& lt" 1. Delete by student number "
Cout & lt& lt"2. Delete by name "
Cout & lt& lt"3. Exit and delete "
}
//Delete student information, including two sub-functions.
void deleteRecord()
{
Int key;
cout & lt& ltendl
info _ delete()；
Cout & lt& lt "Please enter your choice:";
CIN & gt； & gt key;
if(key == 1)
{
int targetNum
Cout & lt& lt "Please enter the student ID of the student you want to delete:";
CIN & gt； & gttargetNum
//Delete by Student ID
delete _ Num(target Num)；
cout & lt& ltendl
}
if(key == 2)
{
char target name[20]；
Cout & lt& lt Please enter the name of the student you want to delete:
CIN & gt； & gttargetName
//Delete by name
delete _ Name(target Name)；
cout & lt& ltendl
}
if(key == 3)
{
while( 1)
{
menu _ CMD()；
}
}
}
//Delete the student information according to the student number.
//Only delete operation is needed, and no output is needed. The output operation can be performed in the main menu.
void delete_Num(int tarNum)
{
int I；
for(I = 1； I<= stuNumi++)
{
If (record [i]. num == tarNum)
{
//Deletion will be discussed in two cases.
// 1. The student information to be deleted is the last one.
//2. The student information to be deleted is not the last one.
//In the first case, the student to be deleted is the last one.
if(i = stuNum)
{
Cout & lt& lt "The student information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<& lt" \t "
& lt& lt record [i]. Score [0] < & lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
Cout & lt& ltendl & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
//Display information should be put in the back.
/*
stuNum-；
Cout & lt& lt "Now only"
cout & lt& ltendl
*/
}
//2. In the second case, the student to be deleted is not the last one.
If (me! = stuNum)
{
Cout & lt& lt "The student letter information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<& lt" \t "
& lt& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
for(int j = I+ 1； j & lt= stuNumj++)
{
Record [j- 1] = record [j];
}
//Then finish the output.
cout & lt& ltendl
Cout & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
/*
stuNum-；
Cout & lt& lt "Now only"
cout & lt& ltendl
*/
}
stuNum-；
Cout & lt& lt "What's left now"
cout & lt& ltendl
}
}
}
/*
//The method is the same as above
void delete_Name(char tarName[])
{
int I；
for(I = 1； I<= stuNumi++)
{
if(strcmp(record[i])。 name，tarName) == 0)
{
//Deletion will be discussed in two cases.
// 1. The student information to be deleted is the last one.
//2. The student information to be deleted is not the last one.
//Case 1: The student to be deleted is the last one.
if(i = stuNum)
{
Cout & lt& lt "The student information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<& lt" \t "
& lt& lt record [i]. Score [0] < & lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
Cout & lt& ltendl & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
}
//In the second case, the student to be deleted is not the last one.
If (me! = stuNum)
{
Cout & lt& lt "The student letter information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<& lt" \t "
& lt& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
//Move forward one place as a whole.
for(int j = I+ 1； j & lt= stuNumj++)
{
Record [j- 1] = record [j];
}
cout & lt& ltendl
//Then finish the output.
Cout & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
cout & lt& ltendl
}
}
}
}
*/
void delete_Name(char tarName[])
{
int I；
for(I = 1； I<= stuNumi++)
{
//Deletion will be discussed in two cases.
// 1. The student information to be deleted is the last one.
//2. The student information to be deleted is not the last one.
//When the student to be deleted is the last one, directly output the information of the previous LEN- 1 student.
if(strcmp(record[i])。 name，tarName) == 0)
{
if(i == stuNum)
{
Cout & lt& lt "The student information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<& lt" \t "
& lt& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
Cout & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
/*
stuNum-；
Cout & lt& lt "Now only"
cout & lt& ltendl
*/
}
//When the student to be deleted is not the last one, move forward one place as a whole.
If (me! = stuNum)
{
Cout & lt& lt "The student information you want to delete is:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex<< "\ t";
Cout & lt& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
//Move forward one place as a whole.
for(int j = I+ 1； j & lt= stuNumj++)
{
Record [j- 1] = record [j];
}
//and then output
cout & lt& ltendl
Cout & lt& lt "The deleted student information table is:"
show _ Table()；
for(int I = 1； I< = stunum-1; i++)
{
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(int j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
/*
stuNum-；
Cout & lt& lt "Now only"
cout & lt& ltendl
*/
}
stuNum-；
Cout & lt& lt "Now only"
cout & lt& ltendl
}
}
}
/*****************************************************************************
******************************************************************************/
//Displays the header information of modifyRecord.
void Info_modify()
{
Cout & lt& lt "Please enter a modification method:"
Cout & lt& lt" 1. Modify according to student number "
Cout & lt& lt"2. Modify by name "
Cout & lt& lt"3. Exit modification "
}
//Inquiring about students' grades, of course, includes two sub-functions.
void modifyRecord()
{
Int key;
cout & lt& ltendl
info _ modify()；
Cout & lt& lt "Please enter your choice:";
CIN & gt； & gt key;
//Modify according to the student number
if(key == 1)
{
int targetNum
Cout & lt& lt "Please enter the student ID of the student you want to modify:";
CIN & gt； & gttargetNum
modify _ Num(target Num)；
cout & lt& ltendl
//Display ();
}
//Modify by name
if(key == 2)
{
char target name[20]；
Cout & lt& lt Please enter the name of the student you want to modify:
CIN & gt； & gttargetName
Modify_Name (target name);
cout & lt& ltendl
//Display ();
}
//Exit modification
if(key == 3)
{
while( 1)
{
menu _ CMD()；
}
}
}
//Modify according to the student number
Void modify_Num (integer)
{
int I；
for(I = 1； I<= stuNumi++)
{
If (record [i]. num == tarNum)
{
Cout & lt& ltendl & lt& lt "Please modify this student's information"
Cout & lt& lt "Please enter your student number:";
CIN & gt； & gt record [i]. num
Cout & lt& lt "Please enter the student's name:";
CIN & gt； & gt record [i]. Name;
Cout & lt& lt "Please enter the gender of the student:";
CIN & gt； & gt record [i]. Sex;
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [0];
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [1];
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [2];
}
}
}
//Modify by name
void modify_Name(char tarName[])
{
int I；
for(I = 1； I<= stuNumi++)
{
if(strcmp(record[i])。 name，tarName) == 0)
{
Cout & lt& ltendl & lt& lt "Please modify this student's information:"
Cout & lt& lt "Please enter your student number:";
CIN & gt； & gt record [i]. num
Cout & lt& lt "Please enter the student's name:";
CIN & gt； & gt record [i]. Name;
Cout & lt& lt "Please enter the gender of the student:";
CIN & gt； & gt record [i]. Sex;
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [0];
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [1];
Cout & lt& lt "Please enter"
CIN & gt； & gt record [i]. Score [2];
}
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//Displays the header information of queryRecord.
void Info_query()
{
Cout & lt& lt "Please enter a query method:"
Cout & lt& lt" 1. Query by student number "
Cout & lt& lt"2. Query by name "
Cout & lt& lt"3. Exit the query "
}
//query student information queryRecord
void queryRecord()
{
Int key;
cout & lt& ltendl
info _ query()；
Cout & lt& lt "Please enter your choice:";
CIN & gt； & gt key;
if(key == 1)
{
int targetNum
Cout & lt& lt "Please enter the student ID of the student you want to query:";
CIN & gt； & gttargetNum
query _ Num(target Num)；
cout & lt& ltendl
}
if(key == 2)
{
char target name[20]；
Cout & lt& lt "Please enter the student ID of the student you want to query:";
CIN & gt； & gttargetName
query _ Name(target Name)；
cout & lt& ltendl
}
//Exit the query and return to the main menu. ...
if(key == 3)
{
while( 1)
{
menu _ CMD()；
}
}
}
//Query by Student ID
void query_Num(int tarNum)
{
int I；
for(I = 1； I<= stuNumi++)
{
If (record [i]. num == tarNum)
{
//If there is information about the student in the table, output the information about the student.
//Output students' information.
Cout & lt& lt "Students' information is as follows:"
//Display header information
show _ Table()；
//Displays the specific information of students.
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
Cout & lt& lt" \ t "<& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
}
}
}
//Query by name
void query_Name(char tarName[])
{
int I；
for(I = 1； I<= stuNumi++)
{
if(strcmp(record[i])。 name，tarName) == 0)
{
Cout & lt& lt "Students' information is as follows:"
show _ Table()；
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
Cout & lt& lt" \ t "<& lt record [i]. Score [0] < & lt" \ t "<& lt record [i]. Score [1] < & lt" \ t "<& lt record [i]. Score [2];
cout & lt& ltendl
}
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//First, display the information of all students.
//Displays the scores of all students in the record.
Empty display ()
{
show _ Table()；
int i，j；
for(I = 1； I<= stuNumi++)
{
//cout & lt； & lt "student number" <<" \ t "<& lt" name "
Cout & lt& lt record [i]. Num<& lt" \ t "<& lt record [i]. Name & lt& lt" \ t "<& lt record [i]. Sex;
for(j = 0； Number of j< topics; j++)
{
Cout & lt& lt" \ t "<& lt record [i]. score[j]；
}
cout & lt& ltendl
}
cout & lt& ltendl
}
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//Exit
Void exit ()
{
char choi
Cout & lt& lt "Are you sure you want to quit?" & lt& ltendl
Cout & lt& lt "Please enter your choice (Yes/No):";
CIN & gt； & gt Cui;
if((choi == 'Y')||(choi == 'y '))
{
Cout & lt& lt "Quit the student information management system now" < & ltendl
Exit (0);
}
//If not, return to the main interface.
other
{
cout & lt& ltendl
menu _ CMD()；
}
}
This is original ... it runs in C-Free 4.0 and works normally.
You can try running, and you can contact me if you have any questions.