学生信息管理系统

/*编译环境为vc++6.0----VS2015*/
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<Windows.h>
#include<ctype.h>
struct list {
char ID[20];
char name[20];
char gender[5];
float score;
struct list *next;
};
/*文件指针*/
char *filename ="'C:\\Users\\ASUS\\Desktop\\myfile.txt";/*文件存储路径*/
int re_ID = 0;                                          /*为了检验是否经过了创建学生信息的检查*/
struct list *List = NULL;                               /*表头*/
struct list *create();                                  /*创建学生链表*/
struct list *Find_Previous(struct list *p);             /*为了删除而使用的查找函数*/
struct list *Find_Previously(struct list *p);           /*为了添加而使用的查找函数*/
struct list *Selectsort(struct list *L);                /*插入排序--按照成绩进行排序*/
void Print();                                           /*打印菜单*/
void Print_Query();                                     /*打印查询菜单*/
void Exit();                                            /*退出*/
void Querying();                                        /*查询*/
void Help();                                            /*帮助手册*/
void Display(struct list *p);                           /*打印表*/
void Save(struct list *pp);                             /*将链表写入文件中*/
void Query_ID(struct list *p);                          /*按学号查询*/
void Query_Name(struct list *p);                        /*按姓名查询*/
void Query_Gender(struct list *p);                      /*按性别查询*/
void Query_Score(struct list *p);                       /*按成绩查询*/
void Addition(struct list *p);                          /*添加学生信息*/
void Delete(struct list *p);                            /*删除学生的信息*/
void Rebuild(struct list *p);                           /*删除所有信息*/
int  check_ID(char ID[]);                               /*检查学号的输入正确性*/
i
118a1
nt main(void)
{
char choice = '\0';
while (1) {
system("cls");
fflush(stdin);
Print();
scanf("%c", &choice);
switch (choice) {
case'1':
List = create();
break;
case'2':
Querying();
break;
case'3':
Selectsort(List);
break;
case'4':
Display(List);
break;
case'5':
Exit();
break;
case'6':
Help();
break;
case'7':
Save(List);
break;
case'8':
Addition(Find_Previous(List));
break;
case'9':
Delete(Find_Previous(List));
break;
case'0':
Rebuild(List);
break;
default:
printf("没有此选择项，请重新输入！\n");
break;
}
}
return 0;
}

struct list *create() {
char ch = '\0';
struct list *head = NULL;
struct list *current = NULL;
struct list *previous = NULL;
while (1) {
printf("请问是否输入学生信息？(Y or N)\n");
scanf(" %c", &ch);
if (tolower(ch) == 'n') {
puts("你选择了取消输入！\n");
system("pause");
break;
}
current = (struct list *)malloc(sizeof(struct list));

if (head == NULL)
head = current;
if (previous != NULL)
previous->next = current;

puts("请输入学生姓名:");
scanf("%s", current->name);
while (1) {
puts("请输入学生学号:");
fflush(stdin);
scanf("%s", current->ID);
if (check_ID(current->ID) == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (1) {
puts("请输入学生的性别:(注意：boy or girl)");
fflush(stdin);
scanf(" %s", current->gender);
if (strcmp(current->gender, "boy") == 0 || strcmp(current->gender, "girl") == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (1) {
printf("请输入学生的成绩:\n");
fflush(stdin);
if (scanf("%f", ¤t->score)!=EOF&¤t->score>=0.0)
break;
else
printf("你输入的格式错误，请重新输入!\n");
fflush(stdin);
}
current->next = NULL;
previous = current;
}
re_ID++;
return (head);
}

void Exit() {   /*这个是用来退出*/
int i = 0;
printf("退出中");
for (i = 4; i > 0; --i) {
Sleep(200);
printf(".");
}
exit(0);
}
void Save(struct list *pp)
{
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *head = NULL;
head = pp;
FILE *fp = NULL;
if (!(fp = fopen(filename, "wb"))) {
fprintf(stderr,"\n打开失败\n");
system("pause");
return;
}
while (head->next != NULL) {
fwrite(head,sizeof(struct list),1,fp);
head = head->next;
}
fclose(fp);
printf("数据读入文件完毕\n");
system("pause");
}

void Display(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
temp = p;
while (temp != NULL) {
printf("-----/*姓名*/--------/*学号*/-----/*性别*/-----/*成绩*/-----\n");
printf("       %s              %s           %s            %.2f\n", temp->name, temp->ID,temp->gender,temp->score);
temp = temp->next;
}
system("pause");
}
void Print() {
printf("-----主菜单功能如下:\n");
printf("-----1.输入学生信息\n");
printf("-----2.查询\n");
printf("-----3.排序\n");
printf("-----4.打印学生信息\n");
printf("-----5.退出\n");
printf("-----6.帮助\n");
printf("-----7.数据写入文件\n");
printf("-----8.插入学生信息\n");
printf("-----9.删除学生信息\n");
printf("-----0.重建学生信息\n");
printf("请输入你的选择!\n");
}
void Help() {
puts("Ver3.0-学生信息管理系统\n");
puts("由于本人是新手，所以一定会有很多的问题\n");
puts("如果能告诉我，在下不胜感激\n");
system("pause");
}
void Print_Query() {
printf("-----查询菜单功能如下:\n");
printf("-----1.按学号查询\n");
printf("-----2.按姓名查询\n");
printf("-----3.按性别查询\n");
printf("-----4.按成绩查询\n");
printf("-----5.退出查询\n");
printf("请输入你的选择:\n");
}
void Querying() {
char cho = '\0';
while (1) {
system("cls");
fflush(stdin);
Print_Query();
scanf("%c", &cho);
switch (cho) {
case'1':
Query_ID(List);
break;
case'2':
Query_Name(List);
break;
case'3':
Query_Gender(List);
break;
case'4':
Query_Score(List);
break;
case'5':
return;
break;
default:
printf("无此选择项!\n");
system("pause");
break;
}
}
}
void Query_Name(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
char na[20];
temp = p;
printf("请输入你想要查询的姓名：\n");
scanf("%s", na);
while (temp != NULL) {
if (strcmp(temp->name, na) == 0) {
printf("你的查找如下：\n");
printf("-----/*姓名*/--------/*学号*/-----/*性别*/-----/*成绩*/-----\n");
printf("        %s              %s          %s            %.2f\n", temp->name, temp->ID, temp->gender, temp->score);
temp = temp->next;
}
else
temp = temp->next;
}
system("pause");
}
void Query_ID(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
char id[20];
temp = p;
while (1) {
printf("请输入你想要查询的学号：\n");
fflush(stdin);
scanf("%s", id);
if (check_ID(id) == 0)
break;
else
puts("你输入的格式错误，请重新输入!");
}
while (temp != NULL) {
if (strcmp(temp->ID, id) == 0) {
printf("你的查找如下：\n");
printf("-----/*姓名*/--------/*学号*/-----/*性别*/-----/*成绩*/-----\n");
printf("       %s              %s          %s            %.2f\n", temp->name, temp->ID, temp->gender, temp->score);
temp = temp->next;
}
else
temp = temp->next;
}
system("pause");
}
void Query_Gender(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
char ge[5];
temp = p;
while (1) {
puts("请输入学生的性别:(注意：boy or girl)");
fflush(stdin);
scanf(" %s", ge);
if (strcmp(ge, "boy") == 0 || strcmp(ge, "girl") == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (temp != NULL) {
if (strcmp(temp->gender,ge) == 0) {
printf("你的查找如下：\n");
printf("-----/*姓名*/--------/*学号*/-----/*性别*/-----/*成绩*/-----\n");
printf("       %s              %s          %s            %.2f\n", temp->name, temp->ID, temp->gender, temp->score);
temp = temp->next;
}
else
temp = temp->next;
}
system("pause");
}
void Query_Score(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
float sc = 0;
temp = p;
while (1) {
puts("请输入学生的成绩:");
fflush(stdin);
if (scanf("%f", &sc) != EOF&&sc >= 0.0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (temp != NULL) {
if (temp->score == sc) {
printf("你的查找如下：\n");
printf("-----/*姓名*/--------/*学号*/-----/*性别*/-----/*成绩*/-----\n");
printf("       %s             %s          %s            %.2f\n", temp->name, temp->ID, temp->gender, temp->score);
temp = temp->next;
}
else
temp = temp->next;
}
system("pause");
}

struct list *Find_Previously(struct list *p){
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return NULL;
}
struct list *temp = NULL;
temp = p;
char iidd[20];
while (1) {
printf("请输入你想要查询的学号：(注意：第一条信息之前不能插入信息)\n");
fflush(stdin);
scanf("%s", iidd);
if (check_ID(iidd) == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (temp != NULL) {
if (strcmp(temp->ID, iidd) == 0) {
break;
}
else
temp = temp->next;
}
return temp;
}
struct list *Find_Previous(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return NULL;
}
struct list *temp = NULL;
temp = p;
char iidd[20];
while (1) {
Display(List);
printf("请输入你想要插入之前的学号：\n");
fflush(stdin);
scanf("%s", iidd);
if (check_ID(iidd) == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (temp != NULL) {
if (strcmp(temp->next->ID, iidd) == 0) {
break;
}
else
temp = temp->next;
}
return temp;
}

void Delete(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
temp = p->next;
p->next = temp->next;
free(temp);
}
void Rebuild(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
return;
}
struct list *temp = NULL;
struct list *tt = NULL;
temp = p;
p->next = NULL;
while (temp != NULL) {
tt = temp->next;
free(temp);
temp = tt;
}
puts("重建学生信信息完成!\n");
re_ID = 0;
system("pause");
}
void Addition(struct list *p) {
if (re_ID == 0) {
printf("请先创建学生信息!\n");
system("pause");
return;
}
struct list *temp = NULL;
temp = (struct list *)malloc(sizeof(struct list));
if (temp == NULL) {
fprintf(stderr, "空间不足！\n");
exit(0);
}
puts("请输入学生姓名:");
scanf("%s", temp->name);
while (1) {
puts("请输入学生学号:");
fflush(stdin);
scanf("%s", temp->ID);
if (check_ID(temp->ID) == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (1) {
puts("请输入学生的性别:(注意：boy or girl)");
fflush(stdin);
scanf("%s", temp->gender);
if (strcmp(temp->gender, "boy") == 0 || strcmp(temp->gender, "girl") == 0)
break;
else
puts("你输入的格式错误，请重新输入!\n");
}
while (1) {
printf("请输入学生的成绩:");
fflush(stdin);
if (scanf("%f", &temp->score) != EOF&&temp->score >= 0.0)
break;
else
printf("你输入的格式错误，请重新输入!\n");
continue;
}
temp->next = p->next;
p->next = temp;
}
int check_ID(char ID[]) {
int i = 0, flag = 0;
while (ID[i] != '\0') {
if (ID[i]<'0' || ID[i]>'9') {
flag = 1;
break;
}
else
i++;
}
return flag;
}

struct list *Selectsort(struct list *L)
{
float temp;
struct list *p, *q, *m;
if (!L->next || !L->next->next)return L;
p = L->next;
while (p->next)
{
m = p;
q = p->next;
while (q)
{
if (q->score<m->score)m = q;
q = q->next;

}
if (p != m)
{
temp = m->score;
m->score = p->score;
p->score = temp;
}
p = p->next;
}

return L;
}