Simple student management system

# Include "stdio. h"
# Include "string. h"
# Include "stdlib. h"
# Define N 3
# Define increase 4
# Define NULL 0
Typedef struct stud
{
Char name [15];
Int age;
Float score;
Struct stud * next;
} L;/* define the table type */
L * p, * that, * othernew, * x, * you, * head;
L * enter_record ()/* Add record */
{
Int n, I = 0;
Float m;
L * new;
Head = new = (L *) malloc (N * sizeof (L ));
If (! New)
{
Printf ("failure for applying room! N ");
Exit (0 );
}
Else
{
P = new;
While (I <N)
{
I ++;
Printf ("please enter name :");
Fflush (stdin );
Gets (p-> name );
Printf ("n ");
Printf ("enter age :");
Fflush (stdin );
Scanf ("% d", & n );
Printf ("n ");
P-> age = n;
Printf ("enter the score :");
Fflush (stdin );
Scanf ("% f", & m );
P-> score = m;
P = p-> next;
}
}
Return head;
}
L * show_record ()/* Display Record */
{
Int c = 1;
L * this;
Printf ("the records are: n ");
This = head;
While (this-> next! = NULL)
{
Printf ("the % d th is: n ");
Printf ("the name is: % sn", this-> name );
Printf ("the age is: % dn", this-> age );
Printf ("the score is: % fn ");
This = this-> next;
C ++;
}
Printf ("the number of records is: % d", c );
Return head;
}
L * delete_record ()/* delete record */
{
Int d;
Printf ("which one record do you want to delete? Number :");
Fflush (stdin );
Scanf ("% d", & d );
Printf ("n ");
If (d> N-1 | d <0)
{
Printf ("error due to the wrong input! N ");
Exit (0 );
}
Else
{
Int e = 1;
That = head;
While (that-> next! = NULL & e <d)
{
That = that-> next;
E ++;
}
That-> next = that-> next;
Free (that-> next );
Printf ("the record has been deleted! N ");
}
Return head;
}

L * insert_record ()/* Add a new record */
{
Int y;
Printf ("where will you insert the new record? Number :");
Fflush (stdin );
Scanf ("% d", & y );
Printf ("n ");
If (y> = 1 & y <= N)
{
Int z = 1, g, h;
X = head;
While (x-> next! = NULL & z <= N)
{
Z ++;
X = x-> next;
}
Othernew = (L *) malloc (sizeof (L ));
X-> next = othernew;
Othernew = x-> next;
Printf ("please input the name new record: % sn", othernew-> name );
Scanf ("% d", & g );
Printf ("enter the age: % dn", g );
Scanf ("% d ",