Data structure Linked List learning notes

#include <stdio.h> #include <stdlib.h> #include <string.h>struct stu_node{char num[15]; int score;struct stu_node *next;}; Struct stu_node *stu_create () {struct stu_node *head, *newn, *tail;char num[ 15];int score;printf ("Please enter student's number and score (school number is 0 to end): \ n"), scanf ("%s%d", Num,&score);newn =  (struct  stu_node *) malloc (sizeof (Struct stu_node)); strcpy (newn->num,num); newn->score =  score;newn->next = null;head =newn;tail = newn;while (1) {printf ("Please enter student's number and score ( The number is 0 to end): \ n "), scanf ("%s%d ", Num,&score), if (strcmp (num," 0 ") ==0) break;else{newn =  (struct stu _node *) malloc (sizeof (Struct stu_node)); strcpy (Newn->num,num);newn->next = null; tail->next = newn;tail = newn;}} Return head;} Void stu_print (struct stu_node *head) {struct stu_node *p = head;if (P==NULL) {printf ("LearnRaw information is empty: "); return;} printf ("\t\n"), while (P!=null)  {printf ("%s\t%d\n", P->num,p->score);p =p->next;}} Void stu_modify (struct stu_node *head) {char num[15];struct stu_node *p=head;if ( Head==null) {printf ("Student Information is empty:"); return;} printf ("Please enter the student number to be modified:"); scanf ("%s", num); while (P!=NULL&NBSP;&AMP;&AMP;&NBSP;STRCMP (p->num, num)!=0) p=p- >next;if (p!=null)  {printf ("Please enter the student's score to be modified") scanf ("%d", &p->score)  ;} elseprintf ("The student who did not find the school number!"); struct stu_node *stu_delete  (struct stu_node *head) {Char num[15];struct stu _node *p=head, *p1;if (p==null) {printf ("Student Information is empty:"), return head; }printf ("Please enter the student number to delete:"); scanf ("%s", num), while (P!=NULL&NBSP;&AMP;&AMP;&NBSP;STRCMP (p->num,num)!=0) {P1=p;p=p->next;} if (p!=null) {if (p=head) Head=p->next;elsep1->next = p->next;free (p)  ;} elseprintf ("The student who has not found the school number!") \ n "); return head;} Void main () {INT&NBSP;CHOICE;STRUCT&NBSP;STU_NODE&NBSP;*HEAD&Nbsp;=null;printf ("Welcome to Student information Management system \ n");p rintf ("\ t-------------------------------------------\ n");p rintf ("\ T1. Create Student Information link List   2. Show student information \ n ");p rintf (" \t3. Modify student information       4. Delete Student information \ n ");p rintf ( "\t5. Exit student information \ n")  ;p rintf ("\ t-------------------------------------------\ n"); while (1) {printf ("\t  Please select the function module, enter the number 1-5: "), scanf ("%d ", &choice)  ;switch (choice) {case 1: head = stu_create ( ); Break;case 2: stu_print (head); Break;case 3: stu_modify (head);break;case 4:  Head = stu_delete (head); break;case 5: exit (0);d efault: printf ("Input Error! \ n ")  ;}}}

Data structure Linked List learning notes