小型学生管理系统的开发 实验5

五小学系开发一实目1提高综合运用C语言进行应程序开发和设的能力。2提高和巩固以前各章所学的知。3理解链表的概念二实要1根据实验内容提出的要求，进程序系统的析和设计。2编写完整的程序代码，上机验通过。三实内利用语言，设计编写一个传统的小型的学生管理系统要求：该系统可以用于管理个班的学生息。学生人数不确定。该系统存放了几乎所的有关学生信息：如学号、姓名、性别出生地址所在系等具体数据设计者分析确定。所有学生信息的数据构及其存储构由设计者分析确定。该系统具有相关的数输入、输出查询、修改、统计、等功能。上机实验前进行系统析和设计。选用适当的算法和数结构，建立应的程序代码。7)

上机调试通证自己编写程序的结果与预料效果之间的关系。参考程序：#include"stdlib.h"

#include"stdio.h"#defineNULLstructstd{charname[20];longnum;charsex;floatscore1;floatscore2;structstd};structstdmain(){voidnew_record(void);voidlistall(void);voiddel_record(void);voidsum(void);charch;intflag=1;head=NULL;while(flag){printf("======================================\n");printf("\n'e'or'E'tonewrecord:");

printf("\n's'or'S'tothesumscoreprintf("\n'l'or'L'toallrecord:");printf("\n'd'or'D'toonerecord:");printf("\n======================================\n");ch=getchar();getchar();switch(ch){case'e':case'E':new_record();break;case'l':case'L':listall();break;case'd':case'D':del_record();break;case's':case'S':sum();break;default:flag=0;}}}intn=0;voidnew_record(void){charnumstr[20];new=(struct*)malloc(sizeof(structif(head==NULL)

head=new;else{this=head;printf("enterstuden'snum,thensystermwillreaddatebyline\n");scanf("%d",&new->num);getchar();if((new->num)<(this->num)){new->next=this;head=new;this=new;}else{if(this->next==NULL){this->next=new;this=new;}else{while((new->num)>(this->num))this=this->next;if(this->next!=NULL)

{new->next=this->next;this->next=new;this=new;}else{this->next=new;this=new;}}}}this=new;n=n+1;printf("\nentergets(this->name);printf("\nentergets(numstr);this->num=atol(numstr);printf("\nenterthis->sex=getchar();getchar();printf("\nentergets(numstr);this->score1=atof(numstr);

printf("\nentergets(numstr);this->score2=atof(numstr);if(this->next!=NULL)this->next=NULL;}voidlistall(void){inti=0;if(head==NULL){printf("\nemptythis=head;do{printf("\nrecord%d\n",++i);printf("name:%s\n",this->name);printf("num:%ld\n",this->num);printf("sex:%c\n",this->sex);printf("score1:%f\n",this->score1);printf("score2:%f\n",this->score2);printf("\nsum=%f,studentave=%f",(this->score1)+(this->score2),((this->score1)+(this->score2))/2);this=this->next;}while(this!=NULL);}

voiddel_record(void){structstdints;printf("inputdelnum:\n");scanf("%d",&s);this=head;p=head;if(s==this->num){head=this->next;free(this);}else{while(s!=this->num){p=this;this=this->next;}p->next=this->next;free(this);}}voidsum(void)

{inte=0;floatsum1=0,sum2=0;if(head==NULL)printf("\nsum1=0,sum2=0.\n");else{this=head;while(this!=NULL){e++;sum1=sum1+this