"C Project" file, structure, list, sort, student information management system

1, password login;

2, through the keyboard input student information, including students study number, name, results;

3, the input information is saved to the specified file;

4, read the student information from the file;

5, display all student information;

6, according to the total score of students in descending order;

7. Deletion of student information;

8, find student information, can be found by the number of students, can also be searched by name;

9, statistics of student information, the highest score and the number of students;

10, exit the system;

Source:

[email protected]:~$ cat main.c  #include <stdio.h> #include <stdlib.h> #include <string.h>struct student{char num[9];char name[9];int scorem;int scoree;int  scorec; int sum;struct student *next;}; Struct student *creat (STRUCT&NBSP;STUDENT&NBSP;*P)//Create a linked list {struct student *p1 =  null;p1 =  (struct student*) malloc (sizeof  (struct student));p  -> next  = p1;p1 -> next = null;printf ("Please enter the information for the student to be added \ n");p rintf ("Study No.:"); scanf ("%s", p1  -> num);p rintf ("name: "), scanf ("%s", P1 -> name);p rintf ("Math score:"); scanf ("%d",& P1 -> scorem);p rintf ("English Score:"),  scanf ("%d", &p1 -> scoree);p rintf ("C-language score:"); scanf ("%d", &p1 -> scorec);p 1 -> sum = 0;p1 -> sum =  p1 -> scorem + p1 -> scorec + p1 -> scoree; printf ("Total score:%d", p1 -> sum); return p1;} VOID&NBSP;SAVE1 (STRUCT&NBSP;STUDENT&NBSP;*P)//Save the list from memory to a file {file *fp;if  (Fp = fopen (" Student_system.txt "," ab+ "))  == null) printf (" Create failed!\n "), while (P != null) {fwrite (p,sizeof ( struct student), 1,FP);p  = p -> next;} Fclose (FP);p rintf ("Save successfully!\n");} Void save2 (STRUCT&NBSP;STUDENT&NBSP;*P)//will be stored in the file with a variable list of information {file *fp;if  (Fp = fopen (" Student_system.txt "," WB "))  == null) printf (" Create failed!\n "), while (P != null) {fwrite (p,sizeof ( struct student), 1,FP);p  = p -> next;} Fclose (FP);} Struct student *read ()//Read the data in the file into the linked list {file *fp;struct student *head=null,*p1=null,*p2= null;if  ((fp=fopen  ("Student_system.txt", "rb+") ==null) {printf  ("File open failed when reading!\n");return  NULL;} head=p1= (struct student *) malloc  (sizeof  (Struct student );while  (fp != null) {if  (Fread (p1,sizeof  (struct student ), 1,FP)  != 1) break;p1 -> next =  (struct student *) malloc  (sizeof   (struct student ));p 2= p1;p1= p1 -> next;} p2->next = null;fclose  (FP); return head;} Struct student *input ()//Add function {char ch;struct student *p = null,*head=null; head=p =  (struct student*) malloc (sizeof (struct student));p-> next = null ;p rintf ("Please enter the information for the student to be added \ n");p rintf ("Study No.:"), &NBSP;SCANF ("%s", P -> num);p rintf ("name: ");  scanf ("%s", P -> name);p rintf ("Math score:"), scanf ("%d", &p -> scorem);p rintf ("English score:"); scanf ("%d", &p -> scoree);p rintf ("C Language score:"); scanf ("%d", &p -> scorec);p  - > sum = 0;p -> sum = p -> scorem + p -> scorec + p -> scoree; printf ("Total score:%d", p -> sum);   (;;)  {printf  ("\ ndo you want to continue entering student information? ( y / n ): \ n "), GetChar ( );ch = getchar  ( );if  (ch ==   ' Y ' | |  ch ==  ' Y ') p = creat (p); else if (ch== ' n ' | |  ch== ' N ') {save1  (head); else printf  ("Your input is wrong, please re-enter,");} Return p->next;} Struct student *output ()//Output function, view all student information {struct student *p ;p  = read ();  if (Read==null) exit (1);p rintf ("\n *************************student***********************\n");p rintf (" -------------------------------------------------------\ n");p rintf (" | | name | math | english | C language | Total |\n ");p rintf ("  -------------------------------------------------------\ n ");while  (p !=  null) {P -> sum = 0;p -> sum = p -> scorem  + p -> scoree + p -> scorec;printf ("|%4s |%-4s|%3d |%3d|%3d|%3d|\n",p->num,  P->name,p->scorem,p->scoree,p->scorec,p->sum);p rintf (" ----------------------------------- --------------------\ n ");p  = p -> next;} Return p;} Struct student *search ()//lookup function {int n;char a[9],b[9];struct student *p =  null,*head = null;printf ("Please select the way you want to find:1  by name 2  by number \ n"), scanf ("%d", &n); if (n==1) { printf ("Please enter the name of the student you are looking for: \ n"); scanf ("%s", a);p =head=read (); while (P!=null) {if (p==null) {printf ("Sorry, there are no people you're looking for.") \ n ");} if (strcmp (p -> name,a) ==0) {printf ("\n *************************student********************** *\n ");p rintf ("  -------------------------------------------------------\ n ");p rintf ("  |  Study number  | name | math | English |&NBSP;C language  | total score  |\n ");p rintf ("  -------------------------------------------------------\ n ");  printf ("  | %4s |%-4s|%3d&nbsP;| %3d|%3d|%3d|\n ", p->num, p->name,p->scorem,p->scoree,p->scorec,p->sum);p rintf ("  -------------------------------------------------------\ n "); P=p->next;}} if (n==2) {printf ("Please enter the student number you want to find: \ n"), scanf ("%s", b);p =head=read (); while (P!=null) {if (p==null) {printf ("Sorry, there are no people you're looking for.") \ n ");} if (strcmp (p -> num,b) ==0) {printf ("\n *************************student*********************** \ n ");p rintf ("  -------------------------------------------------------\ n ");p rintf ("  |  Study No.  | name | math | English |&NBSP;C language  | total score  |\n ");p rintf ("  -------------------------------------------------------\ n ");  printf ("  | %4s |%-4s|%3d | %3d|%3d|%3d|\n ",p->num, p->name,p-> Scorem,p->scoree,p->scorec,p->sum);p rintf (" ---------------------------------------------------- ---\ n "); break;} P=p->next;}} Return head;} Struct student *dele ()//delete function {struct student *p1=null,*p2=null,*head=Null;char a[9];output ();p rintf  ("Please enter the name of the person who needs to delete the information: \ n");scanf  ("%s", a);p 1=head=read (); if (head== NULL) {printf ("Sorry, there is no information temporarily, cannot be deleted.") \ n ");} while  (head!=null) {if (strcmp (a,head -> name)  != 0 && p1->next !=null ) {p2=head ;head= head->next ;if (head==null)  break;} if (strcmp (a,head -> name)  == 0 && p1==head) {p1=head->next ;} if (strcmp (a,head->name) ==0) {p2->next=head->next;save2 (p1);p rintf ("The student's information was deleted successfully! "); break;}} if (head==null) printf ("Sorry, there is no information for the student.") \ n "); return head;} Struct student *change ()//Modify function {int a;char x[9];struct student *p =  Null,*head = null,*q = null;output ();p  = head = read ();p rintf (" Please enter the name of the person to be modified: \ n "), scanf ("%s ", x), if (p == null) {printf (" Without this person!\n "); exit (1); while  (p != null) {if  (strcmp (p -> name,x)  == 0) {q = p; break;} P = p -> next;} if (p!=null) {printf ("Please select modified content: \ n");p rintf ("1. Name \ n");p rintf ("2.");p rintf ("3. Math result \");p rintf ("4. English result \ n");  printf ("5.C result \ n");d o {scanf  ("%d", &a); if (a < 0 | |  a > 6) printf  ("You entered the wrong number, please re-enter: \ n");} while  (a<=0| | a>=6);switch  (a) {case 1 :p rintf ("Please enter the changed name: \ n"); scanf ("%s", P -> name);  break;case 2 :p rintf ("Please enter the changed number: \ n"); scanf ("%s", p -> num); break;case 3 : printf ("Please enter the changed math score: \ n"), scanf ("%d", &p -> scorem);break;case 4 :p rintf (" Please enter the changed English score: \ n "), scanf ("%d ", &p -> scoree);break;case 5 :p rintf (" Please enter the changed C score: \ n "); &NBSP;SCANF ("%d", &p -> scorec); p->sum =0;p->sum=p->scorem +p->scoree +p->scorec ;p rintf ("Total after change:%d",p-> sum);save2  (head); output ();} if (p==null) {printf ("Sorry, no this person.") \ n ");} Return head;} Struct&nBsp;student *sortsum (Struct student*head)//Sort function  {struct student*p,*p1,*p2,*p3;struct  student m, n;if  (head == null)  return NULL;m.next=head;p=&m;while  (P->next!=null) {P=p->next;} p=p->next=&n;while  (P!=m.next) {p3=&m;p1=p3->next;p2=p1->next;while  (p2!=p)  {if   (p1 -> sum)  <  (p2 -> sum)  )  {p1->next=p2->next; P2->next=p1;p3->next=p2;p3=p2; p2=p1->next;} Else{p3=p1;p1=p2;p2=p2->next;}} P=P1;} while  (p->next!=&n) {p=p->next;} P->next=null;return m.next;} Struct student *outputsortsum ()//score sort Output {Int i=0;struct student *head = null  , *p = null;head = read ();p  = sortsum (head);p rintf ("\n*************** student****************************\n ");p rintf ("---------------------------------------------------- --------\ n ");p rintF ("|   |  School Number  |  name  | Mathematics  | English  | c language  | total  |\n");p rintf ("----- -------------------------------------------------------\ n "), while (p != null) {i++;p rintf (" | %3d|  %4s |%-4s|%3d|%3d|%3d|%3d|\n ",i,p->num,p->name,p->scorem,p->scoree,p->scorec,p-> SUM);p rintf ("------------------------------------------------------------\ n");p =p->next;} Return head;} Struct student *statistic ()//Statistical function {int m = 0;struct student *head=null; Struct student *p,*q;p = head = read (); while ( p != null) {m++;p  = p -> next;} printf ("A total of%d student information. \ n", m); Q= sortsum (head);p rintf ("Information of the students with the highest scores: \ n");p rintf ("\n*********************** student*************************\n ");p rintf ("-------------------------------------------------------\ n "); printf ("|   | name | math | English | c language  | score  |\n");p rintf ("-------------------------------------------------------\ n ");p rintf (" | %4s |%-4s|%3d |%3d |%3d| %3d |\n ", Q >num,q->name,q->scorem,q->scoree,q->scorec,q->sum);p rintf ("--------------------------------- ----------------------\ n "); return head;} void login1  () {while (1) {int a=1;int i;char ch[10];char num[20]={"ABCDE"};p rintf ( "Please enter the password \ n" before entering the admin score Management system;p rintf ("Please enter your password  : ") scanf ("%s", ch); if (strcmp (num,ch) ==0) {a = 0;} if (a!=0) { printf ("\ n this password is wrong!   ");  printf (" \ n Please enter the correct password: ");} Else{break;}}} void login2  ()  {while (1) {int a=1;int i;char ch[10];char num[20]={"12345"}; printf ("Please enter the password before entering the student performance management system \ n");p rintf ("Please enter your password  :"); scanf ("%s", ch); if (strcmp (num,ch) ==0) a = 0;if (a==0) {printf ("\ n welcome into Student performance management System  !\n"); GetChar (); break;} else {printf ("\ n this password is wrong!   ");p rintf (" \ n Please enter the correct password: ");}}} Void menu1 () {System ("clear");p rintf ("Welcome to admin Management System! \ n ");p rintf (" ************************Main Menu ****************************\n ");p rintf (" *1  Add student Achievement *\n ");p rintf (" *2  Find student Achievement *\n ");p rintf ("   Delete designated student *\n ");p rintf (" * 4  Modify student Information *\n ");p rintf (" *5  Total sorting information *\n ");p rintf (" *6  View all Information *\n "); printf ("*7  Statistics *\n"),  printf ("*8  Stop program Run *\n");p rintf ("**************************************** \ n ");} Void menu2 () { system ("clear");p rintf ("Welcome to the Student management system! \ n ");p rintf (" ******************************* main Menu ****************************\n ");p rintf (" *1  Find student Achievement *\n "); printf ("*2  Score sorting Information *\n");p rintf ("* 3  View all Information *\n");p rintf ("*4  Statistics students *\n");  printf ("*  5  Stop program Run *\n ");p rintf (" *****************************************************************\n ");} Void main () {Int a,m;int b = 1;system ("clear");p rintf ("★★★★★★★★★★★★★★★★★★★★★★★★★★★\n") ;p rintf ("!\n Welcome");p rintf ("Please select the management system  \n you want to enter")  printf ("1. Admin management System. \ n ");p rintf (" 2. Student management System. \ n ");p rintf (" 3. Exit the System! \ n ");p rintf (" ★★★★★★★★★★★★★★★★★★★★★★★★★★★\n ");p rintf (" Please select:  ") scanf ("%d ", &m); if (m==1) {login1 ();} if (m==2) {login2 ();} while  (b == 1) {if (m==1) {menu1 (); scanf ("%d", &a); switch (a) {case 1 :input (); break; Case 2 :search (); break;case 3 :d ele (); Break;case 4 :change (); break; Case 5 :outputsortsum (); Break;case 6 :output ();  break;case 7 :statistic (); Break; case 8 :exit (1);d efault :p rintf ("Input Error! \ n "); printf ("\ n \ nyou Choose Next action: \ n");p rintf (" 1 .  Return to main Menu  2 .  exit program \ n"); scanf ("%d", &b);} if (m==2)  {menu2 (); scanf ("%d", &a); switch (a) {Case 1 :search ();  break;case 2 :o Utputsortsum (); Break;case 3 :output ();  break;case 4 :statistic (); break; case  5 :exit (1);d efault :p rintf ("Input Error! \ n "); printf ("\ n \ nyou Choose Next action: \ n");p rintf (" 1 .  Return to main Menu  2 .  exit program \ n"); scanf ("%d", &b);} if (m==3) exit  (1);}} [email protected]:~$

Compile run:

[email protected]:~$ gcc main.c  && ./a.out  ★★★★★★★★★★★★★★★★★★★★★★★★★★★ Educational Administration System welcome you! Please select the management system  1 you want to enter. Administrator Management System. 2. Student management System. 3. Exit the System! ★★★★★★★★★★★★★★★★★★★★★★★★★★★ Please choose:  1 Enter the Administrator score management system before you enter the password please enter your password  : ABCDE Welcome to the Administrator management system! Main Menu *****************************1  Add student scores **2  find student scores **3  Delete designated students * *  4  Modify student Information **5  Total score Sort Information **6  View all information **7  Statistics students **8  stop program run ******************************* 6 *************************student*********************** ------- ------------------------------------------------ | | name | math | english | C language | Total | -------------------------------------------------------|   1 |LUCY| 12  | 32|  0| 44| -------------------------------------------------------|   45 |34  |354 |343|4234|4931| -------------------------------------------------- -----Please select the following: &Nbsp;1 .  back to main Menu  2 .  exit program 

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"C Project" file, structure, list, sort, student information management system