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1、简单学生信息管理系统用c语言实现学生信息单向链表，有建立，插入，删除，打印显示功能，如果输入是同一个学生的，信息将更新，不同学生按学号由小到大排列。#include#include#defineNULL0#defineLENsizeof(structstudent)structstudent{longnum;floatscore;structstudent*next;};intn;voidswap(float*p1,float*p0){*p1=*p0;}structstudent*creat(
2、){structstudent*head;structstudent*p1,*p2;n=0;p1=p2=(structstudent*)malloc(LEN);scanf("%ld,%f",&p1->num,&p1->score);head=NULL;while(p1->num!=0){n=n+1;if(n==1)head=p1;else{if(p1->num==p2->num){p2->score=p1->score;n--;gotoend;}elsep2->next=p1;}p2=p1;p1=(structstudent*)m
3、alloc(LEN);end:scanf("%ld,%f",&p1->num,&p1->score);}p2->next=NULL;return(head);}voidprint(structstudent*head){structstudent*p;printf("现在系统有%d个学生",n);p=head;if(head!=NULL)do{printf("%ld%5.1f",p->num,p->score);p=p->next;}while(p!=NULL);}structstudent*del(structstu
4、dent*head,longnum){structstudent*p1,*p2;if(head==NULL){printf("listnull!");gotoend;}p1=head;while(num!=p1->num&&p1->next!=NULL){p2=p1;p1=p1->next;}if(num==p1->num){if(p1==head)head=p1->next;elsep2->next=p1->next;printf("学号为:%ld的学生被删除了",num);n=n-1;}elseprintf("系统
5、没有学号为%ld的学生!",num);end:return(head);}structstudent*insert(structstudent*head,structstudent*stud){structstudent*p0,*p1,*p2;p1=head;p0=stud;if(head==NULL){head=p0;p0->next=NULL;}else{while((p0->num>p1->num)&&(p1->next!=NULL)){p2=p1;p1=p1->next;}if(p0->num==p1->num){p1
6、->score=p0->score;free(p0);gotoend;}else{if(p0->numnum){if(head==p1)head=p0;elsep2->next=p0;p0->next=p1;}else{p1->next=p0;p0->next=NULL;}}}n=n+1;end:return(head);}main(){structstudent*head,*stu;longdel_num;printf("输入学生:学号,成绩（输入0，0时结束）");head=creat();print(head)
7、;printf("输入要删除的学生的学号:");scanf("%ld",&del_num);while(del_num!=0){head=del(head,del_num);print(head);printf("输入要删除的学生的学号:（输入0时退出）");scanf("%ld",&del_num);}print(head);printf("插入一个学生信息:学号,成绩（输入0，0时结束）");stu=(structstudent*)malloc(LEN);scanf("%ld,%f",&stu->num,&stu-
8、>score);while(stu->num!=0){head=insert(head,stu);print(head);printf("插入一个学生信息:学号,成绩（输入0，0时结束）");stu=(structstudent*)malloc
