C语言之学生管理系统

运行结果：程序源码：#include<stdio.h>#include<malloc.h>#include<string.h>#include<stdlib.h>求字节数运算符#include<conio.h>求字节数运算符#defineLENsizeof(structstudent)//structstudent{charname[20];longintnum;charsex[4];intage;charaddress[30];floatscore;structstudent*next;//链表};//定义一个结构题intTOTAL_NUM=0;//学生总数structstudent*head=NULL;voidmainmenu();//主界面voidrecord();//记录数据voidinsert(structstudent*stu);//插入数据voiddisplay(structstudent*stu);//显示一个学生的信息voiddisplayAll();//显示所有学生的信息voidquery();//查询学生信息voidquery_by_num();//按学号查询学生信息voidquery_by_name();voidreadData();//读取文件里学生的信息voidwriteData();//向文件写入学生信息voidfreeAll();//清空链表内容voiddel();//删除学生信息voidchange();//更改学生信息voidsort();//排序voiddevise(structstudent*p);//选择更改内容intmain(void){mainmenu();return0;}//系统主菜单voidmainmenu()intchoice;choice=-1;readData（）;printf（"\t\t\t \n"）;printf（"\t\t\t| 欢迎使用通信工程专业学生信息管理系统 |\n"）;printf（"\t\t\t \n"）;printf（"\t\t\t本程序需要在当前目录下建立student.txt才可正常运行\n"）;do{printf（"\n\n\n"）;printf（"\t\t\t \n"）;printf（"\t\t\t通信工程专业学生信息管理系统|\n"）;printf（"\t\t\t \n"）;printf（"\t\t\t[1] 录入学生信息 |\n"）;printf（"\t\t\t[2] 浏览学生信息 |\n"）;printf（"\t\t\t[3] 查询学生信息 |\n"）;printf（"\t\t\t[4] 删除学生信息 |\n"）;printf（"\t\t\t[5] 修改学生信息 |\n"）;printf（"\t\t\t[6] 排序|\n"）;printf（"\t\t\t[0] 退出系统|\n"）;\n"）;printf（"\t\t\t\n"）;printf（"请输入您的选择"）;scanf("%d",&choice);switch(choice){case0:writeData();freeAll();exit(0);case1:record();break;case2:displayAll();break;case3:query();break;case4:del();break;case5:change();break;case6:sort();break;default:printf("\n无效选项!");break;}}while(choice!=0);}//录入学生信息voidrecord(){structstudent*p0;p0=(structstudent*)malloc(LEN);printf("\t\t\t请输入学生的姓名:");scanf("%s",p0->name);printf("\t\t\t请输入学生的学号:");scanf("%ld",&p0->num);printf("\t\t\t请输入学生的性别:");scanf("%s",p0->sex);printf("\t\t\t请输入学生的年龄:");scanf("%d",&p0->age);printf("\t\t\t请输入学生的地址:");scanf("%s",p0->address);printf("\t\t\t请输入学生的成绩:");scanf("%f",&p0->score);insert(p0);printf("\t\t\t该学生的信息为:\n");printf("\t\t\t \n");printf("\t\t\t姓名\t学号\t\t年龄\t性别\t地址\t\t成绩\n");display(p0);}voidinsert(structstudent*stu){structstudent*p0,*p1,*p2;p1=head;p0=stu;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){if(head==p1)head=p0;elsep2->next=p0;p0->next=p1;}else{p1->next=p0;p0->next=NULL;TOTAL_NUM++;}voiddisplay(structstudent*p){printf("\t\t\t%s\t%ld\t\t%d\t%s\t%s\t\t%f\n",p->name,p->num,p->age,p->sex,p->address,p->score);}//浏览学生信息voiddisplayAll(){structstudent*p;printf("\t\t\t学生总数:%d\n",TOTAL_NUM);p=head;if(head!=NULL){printf("\t\t\t姓名\t学号\t\t年龄\t性别\t地址\t\t成绩\n");printf("\t\t\t \n");do{display(p);p=p->next;while(p!=NULL);}printf("\n");}voidquery(){intchoice;choice=-1;do{printf("\n");printf(" \n");printf("|按学号查询请按1|\n");printf("|按姓名查询请按2|\n");printf("|取消请按0|\n");printf("+ +\n");printf("请输入您的选择");scanf("%d",&choice);switch(choice){case0:return;case1:query_by_num();break;case2:query_by_name();break;default:printf("\n 无效选项！”);break;}}while(choice!=0);}//按姓名查询学生信息voidquery_by_name(){charname[20];structstudent*p1;printf("请输入学生的姓名");scanf("%s",name);if(head==NULL){printf("无学生记录 \n”)；return;}p仁head;while(strcmp(name,p1->name)&&p1->next!=NULL)p1=p1->next;if(!strcmp(name,p1->name)){printf("\t\t\t姓名\t学号\t\t年龄\t性别\t地址\t\t成绩\n");printf("\t\t\t \n");display(pl);}elseprintf("没有该学生记录请核对】；}//按学号查询学生信息voidquery_by_num(){intnum;structstudent*p1;printf("请输入学生的学号");scanf("%ld",&num);if(head==NULL){printf("无学生记录\n”);return;}p1=head;while(num!=p1->num&&p1->next!=NULL)pl=p1->next;if(num==p1->num){printf("\t\t\t姓名\t学号\t\t年龄\t性别\t地址\t\t成绩\n");printf("\t\t\t \n");display(p1);}elseprintf("\t\t\t没有该学生记录请核对 ”)；}//写入文件voidwriteData(){FILE*fp;〃文件指针structstudent*p;fp=fopen("1.txt","w");if(!fp){printf("文件打开错误 Lreturn;}fprintf(fp,"%d\n",TOTAL_NUM);for(p=head;p!=NULL;p=p->next){fprintf(fp,"%s\t%ld\t%s\t%d\t%s\t%f\n",p->name,p->num,p->sex,p->age,p->address,p->score);}fclose(fp);}voidfreeAll(){structstudent*p1,*p2;p1=p2=head;while(p1){p2=p1->next;free(p1);p1=p2;}}//读取文件voidreadData(){FILE*fp;//文件指针structstudent*p1,*p2;fp=fopen("student.txt","r");if(!fp){printf("文件打开错误");return;}fscanf(fp,"%d\n",&TOTAL_NUM);head=p1=p2=(structstudent*)malloc(LEN);fscanf(fp,"%s\t%ld\t%s\t%d\t%s\t%f\n",p1->name,&p1->num,p1->sex,&p1->age,p1->address,&p1->score);while(!feof(fp)){p1=(structstudent*)malloc(LEN);fscanf(fp,"%s\t%ld\t%s\t%d\t%s\t%f\n",p1->name,&p1->num,p1->sex,&p1->age,p1->address,&p1->score);p2->next=p1;p2=p1;}p2->next=NULL;fclose(fp);}//删除学生信息voiddel(){structstudent*p1,*p2;longintnum;if(head==NULL){printf("无学生记录\n");return;}printf("请输入您要删除的学生的学号");scanf("%ld",&num);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;free(p1);TOTAL_NUM--;}elseprintf("没有该学生记录请核对\n");}voidsort()//排序模块。将学生记录按学号从小到大排列。用起泡排序算法实现{inti;structstudent*ptr,*s=head,*p;intcount=0,count1;while(s)//统计链表结点个数{count++;s=s->next;}for(i=1;i<count;i++){ptr=head;p=NULL;个结点while(ptr&&ptr->next&&(count1--)){if(ptr->score>ptr->next->score){s=ptr->next;ptr->next=s->next;if(p==NULL)〃ptr处于队头时head=s;elsep_>next=s;s->next=ptr;p=s;}else{ptr=ptr->next;if(p==NULL)//ptr处于队头时p=head;elsep=p->next;}}displayAll();return;}voidchange(){structstudent*p1,*p2;longintnum;if(head==NULL){printf("无学生记录\n");return;}printf("请输入您要修改的学生的学号");scanf("%ld",&num);p1=head;while(num!=p1->num&&p1->next!=NULL){p2=p1;p1=p1->next;if（num==p1->num）devise（p1）;elseprintf（"没有该学生记录请核对\n"）;}voiddevise（structstuden