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C language program (student information management system) (problem) urgent ...
This is what I wrote before, which may not meet your requirements, but you can refer to it and it is useful to you.

Structure teacher

{

char t _ name[20];

int t _ age

char t _ job[20];

char t _ job place[20];

struct Teacher * next

};

Structural students

{

char s _ name[20];

int s _ age

char s _ zhuan ye[30];

int s _ class

Structural students * next;

}; //saved in the Teacher.h file.

# include & ltstdio.h & gt

# include & ltstring.h & gt

# contains "Teacher.h"

External character operation;

External char operate _ object

extern int s _ flag

extern int t _ flag

Teacher, teacher;

Teacher * T;;

Teacher * nt

Students, students;

Students';

Student * ns

Enter ()

{

flush all();

extern Operate();

//printf("%c ",operate);

Printf ("Please select the object you need to manipulate \ n");

Printf ("student teacher (t) \ n");

scanf("%c ",& ampoperate _ object);

//printf("%c\n ",operate _ object);

Switch (operate_object)

{

Case:

s _ flag++;

flush all();

Printf ("\ nPlease enter student name:");

Scanf("%s ",& student. s _ name);

Printf ("\ nPlease enter the age of the student:");

scanf("%d ",& ampstudent . s _ age);

Printf ("\ nPlease enter the student's major:");

scanf("%s ",& ampstudent . s _ zhuan ye);

Printf ("\ nPlease enter student class:");

scanf("%d ",& ampstudent . s _ class);

Ns = (student *)malloc(sizeof));

strcpy(ns-& gt; s_name,student . s _ name);

ns-& gt; s _ age = student.s _ age

strcpy(ns-& gt; s_zhuanye,student . s _ zhuan ye);

ns-& gt; s _ class = student.s _ class

ns-& gt; next = S-& gt; Next;

s-& gt; next = ns

operate();

Break;

Case:

s _ flag++;

flush all();

Printf ("\ nPlease enter student name:");

Scanf("%s ",& student. s _ name);

Printf ("\ nPlease enter the age of the student:");

scanf("%d ",& ampstudent . s _ age);

Printf ("\ nPlease enter the student's major:");

scanf("%s ",& ampstudent . s _ zhuan ye);

Printf ("\ nPlease enter student class:");

scanf("%d ",& ampstudent . s _ class);

Ns = (student *)malloc(sizeof));

strcpy(ns-& gt; s_name,student . s _ name);

ns-& gt; s _ age = student.s _ age

strcpy(ns-& gt; s_zhuanye,student . s _ zhuan ye);

ns-& gt; s _ class = student.s _ class

ns-& gt; next = S-& gt; Next;

s-& gt; next = ns

operate();

Break;

Case "t":

t _ flag++;

flush all();

Printf ("\ nPlease enter teacher's name:");

scanf("%s ",& ampteacher . t _ name);

Printf ("\ nPlease enter the age of the teacher:");

scanf("%d ",& ampteacher . t _ age);

Printf ("\ nPlease enter the course taught by the teacher:");

Scanf("%s ",& teacher. t _ job);

Printf ("\ nPlease enter the teacher's office:");

scanf("%s ",& ampteacher . t _ jobPlace);

Nt = (teacher *)malloc(sizeof));

strcpy(nt-& gt; t_name,teacher . t _ name);

nt-& gt; t _ age = teacher.t _ age

strcpy(nt-& gt; t_job,teacher . t _ job);

strcpy(nt-& gt; t_jobPlace,teacher . t _ job place);

nt-& gt; next = T-& gt; Next;

t->; next = nt

operate();

Break;

Case "t":

t _ flag++;

flush all();

Printf ("\ nPlease enter teacher's name:");

scanf("%s ",& ampteacher . t _ name);

Printf ("\ nPlease enter the age of the teacher:");

scanf("%d ",& ampteacher . t _ age);

Printf ("\ nPlease enter the course taught by the teacher:");

Scanf("%s ",& teacher. t _ job);

Printf ("\ nPlease enter the teacher's office:");

scanf("%s ",& ampteacher . t _ jobPlace);

Nt = (teacher *)malloc(sizeof));

strcpy(nt-& gt; t_name,teacher . t _ name);

nt-& gt; t _ age = teacher.t _ age

strcpy(nt-& gt; t_job,teacher . t _ job);

strcpy(nt-& gt; t_jobPlace,teacher . t _ job place);

nt-& gt; next = T-& gt; Next;

t->; next = nt

operate();

Break;

Default value:

Printf ("The operand you entered is illegal, please re-enter \ n");

input();

Break;

}

}//saved in the Input.h file for input operation.

# include & ltstdio.h & gt

# contains "Input.h"

extern Operate();

External character operation;

External char operate _ object

extern int s _ flag

extern int t _ flag

Teacher extern * T;;

Day students;

Structure Student * S _ node

Structural students * s1;

Teacher struct * t1;

Teacher struct * T _ node

Output ()

{

flush all();

External input ();

Printf ("Please enter the object to operate \ n");

Printf(" \ n student teacher (t) \ n ");

scanf("%c ",& ampoperate _ object);

if(operate _ object = = ' S ' | | operate _ object = = ' S ')

{

flush all();

if(s_flag! = 0)

{

while(S_node! = empty)

{

printf("%s,%d,%s,%d\n ",s 1-& gt; Next-> s_name,s 1-& gt; Next-> s_age,s 1-& gt; Next-> s_zhuanye,s 1->; Next-> s _ class);

s 1 = s 1->; Next;

s _ node = s 1-& gt; Next;

}

Printf ("\ nOutput completed \ n");

operate();

}

other

{

Printf ("\ nThere is nothing to output, please do something else \ n");

operate();

}

}

if(operate _ object = = ' T ' | | operate _ object = = ' T ')

{

flush all();

if(t_flag! = 0)

{

while(T_node! = empty)

{

printf("%s,%d,%s,%s\n ",t 1-& gt; Next-> t_name,t 1-& gt; Next-> t_age,t 1->; Next-> t_job,t 1-& gt; Next-> t _ job place);

t 1 = t 1->; Next;

t _ node = t 1-& gt; Next;

}

}

other

{

Printf ("\ nThere is nothing to output, please do something else \ n");

operate();

}

}

}

//Save it in the Output.h file for output operation.

# include & ltstdio.h & gt

# include & ltstring.h & gt

# contains "Search.h"

char operate = ' s

char operate _ object = ' s

int s _ flag = 0;

int t _ flag = 0;

External output ();

External search ();

//extern Delete();

Teacher extern * T;;

Day students;

Teacher extern * nt

Day students;

Operation ()

{

flush all();

char q _ sure

Printf ("\ nPlease select what you need to do \ n");

Printf(" i or i stands for input operation \ n ");

Printf(" o or o stands for output operation \ n ");

Printf(" s or s stands for query operation \ n ");

Printf(" d or d stands for delete operation \ n ");

Printf(" q or q stands for exit operation \ n \ n ");

Scanf("%c ",& operation);

//printf("%d, %d ",& operation & operate _ object);

Switch (operation)

{

Case "I":

flush all();

input();

Break;

Case "I":

flush all();

input();

Break;

Case "o":

flush all();

output();

Break;

Case "o":

flush all();

output();

Break;

Case:

flush all();

search();

Break;

Case:

flush all();

search();

Break;

Case "d":

flush all();

//Delete();

Break;

Case "d":

flush all();

//Delete();

Break;

Case "q":

flush all();

Printf ("\ nAre you sure you want to quit? \ n ");

printf(" \ N confirm(y)Cancel(N)\ N ");

scanf("%c ",& ampq _ sure);

if(q_sure == 'Y' || q_sure == 'y ')

{

Break;

}

if(q_sure == 'N' || q_sure == 'n ')

{

operate();

}

Case "q":

flush all();

Printf ("\ nAre you sure you want to quit? \ n ");

printf(" \ N confirm(y)Cancel(N)\ N ");

scanf("%c ",& ampq _ sure);

if(q_sure == 'Y' || q_sure == 'y ')

{

Break;

}

if(q_sure == 'N' || q_sure == 'n ')

{

operate();

}

Break;

Default value:

Printf ("The operand you entered is illegal, please re-enter \ n");

operate();

Break;

}

}

//Save it in the Operate.h file to select the operation to be performed.