大一上学期的期末作业，只记得当时弄了好长时间。在写代码的过程中，能发现很多问题，错误，折磨人的很。不过也确实学到了好多东西。这其中，有王瑶哥和菲菲姐的热心帮助。在此谢谢他们喽～

当然，现在看来，代码还有很多可以优化的地方。本程序功能还算齐全，BUG还有待发现，没有包含输入检测机制。精力有限，后悔当年没有养成写注释的习惯，现在放在那里自己都不愿意看了，=_=!  等以后有机会用C++再写个吧。

图样：

代码：

/*
* C语言学生信息管理系统（动态链表版）
* 作者：odaynot
* 时间：2011年
* 功能：增添新键数据、修改删除数据、查询统计数据
* 平台：windows
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
# define LEN sizeof(struct Student)struct Student {
char num[10];  /*学号*/
char name[20]; /*姓名*/
char sex[10];  /*性别*/
int age;       /*年龄*/
char phone[12];/*电话*/
char qq[12];   /*QQ号*/
float cscore;  /*C语言成绩*/
float escore;  /*英语成绩*/
struct Student *next;
};char filename[30];//全局变量，用来保存要打开的文件名字/*生成链表*/
struct Student *Creat(int n) {void menu_print_in(void);struct Student *head;struct Student *p1, *p2;system("cls");for(int i=1;i<n+1;i++) {p1 = (struct Student*)malloc(LEN);menu_print_in();scanf("%s%s%s%d%s%s%f%f",p1->num,p1->name,p1->sex,&p1->age,p1->phone,p1->qq,&p1->cscore,&p1->escore);p1->next = NULL;if(i==1) {head = p2 = p1;}else {p2->next = p1;p2 = p1;}}return(head);
}/*数据存盘(wb只写)*/
void WriteData_wb(struct Student *head) {FILE *fp;struct Student *p;if((fp = fopen(filename, "wb"))==NULL)printf("\a error! Can not open the file!");p = head;while(p!=NULL) {if(fwrite(p,LEN,1,fp)!=1) {printf("写入数据出错\n");fclose(fp);return;}p=p->next;}fclose(fp);
}/*数据存盘(ab追加)*/
void WriteData_ab(struct Student *head) {FILE *fp;struct Student *p;if((fp = fopen(filename, "ab"))==NULL)printf("\a error! Can not open the file!");p = head;while(p!=NULL) {if(fwrite(p,LEN,1,fp)!=1) {printf("写入数据出错\n");fclose(fp);return;}p=p->next;}fclose(fp);
}/*读取数据*/
/*读取数据文件保存到链表中 ，返回指向此链表头指针*/
struct Student *ReadData(void) {struct Student *head = NULL;struct Student *p1, *p2;//s = p1;p = p2;FILE *fp;if((fp=fopen(filename,"rb+"))==NULL){printf("打开文件出错\n");exit(0);}while(!feof(fp)) {if((p1=(struct Student*)malloc(LEN))==NULL){printf("内存申请出错\n");fclose(fp);exit(0);}if(fread(p1,LEN,1,fp)!=1){free(p1);break;}if(head==NULL)head=p2=p1;else{p2->next=p1;p2=p1;}}fclose(fp);return (head);
}/*【1】全量查询*/
void Print_inquire_all(void) {void menu_print_out(void);struct Student *pt;pt = ReadData();menu_print_out();do {printf("%-10s%6s%8s%4d%13s%11s  %4.1f %4.1f %4.1f %4.1f\n",pt->num,pt->name,pt->sex,pt->age,pt->phone,pt->qq,pt->cscore,pt->escore,(pt->cscore+pt->escore)/2,pt->cscore+pt->escore);pt = pt->next;}while(pt!=NULL);printf("\n\n");
}/*【2】学号查询*/
int Print_inquire_num() {void menu_print_out(void);struct Student *pt;char str_num[10];printf("◎请输入您要查询的学号:");scanf("%s", str_num);pt = ReadData();menu_print_out();do {if(strcmp(pt->num,str_num)==0) {printf("%-10s%6s%8s%4d%13s%11s  %4.1f %4.1f %4.1f %4.1f\n",pt->num,pt->name,pt->sex,pt->age,pt->phone,pt->qq,pt->cscore,pt->escore,(pt->cscore+pt->escore)/2,pt->cscore+pt->escore);printf("\n\n");return 0;}pt = pt->next;}while(pt!=NULL);printf("数据库中没有存储您要查询的数据！\n");printf("\n\n");return 0;
}/*【3】姓名查询*/
int Print_inquire_name() {void menu_print_out(void);struct Student *pt;char str_name[20];printf("◎请输入您要查询的姓名:");scanf("%s", str_name);pt = ReadData();menu_print_out();do {if(strcmp(pt->name,str_name)==0) {printf("%-10s%6s%8s%4d%13s%11s  %4.1f %4.1f %4.1f %4.1f\n",pt->num,pt->name,pt->sex,pt->age,pt->phone,pt->qq,pt->cscore,pt->escore,(pt->cscore+pt->escore)/2,pt->cscore+pt->escore);printf("\n\n");return 0;}pt = pt->next;}while(pt!=NULL);printf("数据库中没有存储您要查询的数据！\n");printf("\n\n");return 0;
}/*【4】模糊查询*/
int Print_inquire_fuzzy(void) {void menu_print_out(void);struct Student *pt;char str_find[20];int m = 0;printf("◎请输入您要查询的关键词:");scanf("%s", str_find);pt = ReadData();menu_print_out();do {if(strstr(pt->num,str_find)!=0||strstr(pt->name,str_find)!=0||strstr(pt->sex,str_find)!=0||strstr(pt->phone,str_find)!=0||strstr(pt->qq,str_find)!=0) {printf("%-10s%6s%8s%4d%13s%11s  %4.1f %4.1f %4.1f %4.1f\n",pt->num,pt->name,pt->sex,pt->age,pt->phone,pt->qq,pt->cscore,pt->escore,(pt->cscore+pt->escore)/2,pt->cscore+pt->escore);m = 1;}pt = pt->next;}while(pt!=NULL);if(!m)printf("数据库中没有存储您要查询的数据！\n");printf("\n\n");return 0;
}/*成绩统计*/
int Print_inquire_stats(void) {struct Student *head, *p1;float CMIN, CMAX, EMIN, EMAX, SMIN, SMAX;head = ReadData();p1 = head;CMIN = CMAX = p1->cscore;EMIN = EMAX = p1->escore;SMIN = SMAX = p1->cscore + p1->escore;while(p1->next!=NULL) {if(p1->cscore > CMAX) {CMAX = p1->cscore;}if(p1->cscore < CMIN) {CMIN = p1->cscore;}if(p1->escore > EMAX) {EMAX = p1->escore;}if(p1->escore < EMIN) {EMIN = p1->escore;}if((p1->cscore + p1->escore) > SMAX) {SMAX = (p1->cscore + p1->escore);}if((p1->cscore + p1->escore) < SMIN) {SMIN = (p1->cscore + p1->escore);}p1 = p1->next;}printf("\n");printf("◎数据库中C语言最高分为:%4.1f \n", CMAX);printf("◎数据库中C语言最低分为:%4.1f \n\n", CMIN);printf("◎数据库中英语最高分为:%4.1f \n", EMAX);printf("◎数据库中英语最低分为:%4.1f \n\n", EMIN);printf("◎数据库中总成绩最高分为:%4.1f \n", SMAX);printf("◎数据库中总成绩最低分为:%4.1f \n\n", SMIN);printf("\n");printf("【PS:更多统计功能更在开发中,敬请期待O(∩_∩)O】\n\n");return 0;
}/*【1】修改数据之删除记录*/
int Delete() {struct Student *pt1, *pt2, *head;char str_num[20];printf("\n◎请输入您要删除的学号信息:");scanf("%s", str_num);pt1 = ReadData();pt2 = pt1->next;head = pt1;while(pt2!=NULL) {if(strcmp(pt1->num,str_num)==0) {WriteData_wb(pt2);}else if(strcmp(pt2->num,str_num)==0) {pt1->next = pt2->next;WriteData_wb(head);}pt2 = pt2->next;pt1 = pt1->next;}if(pt2!=NULL)printf("数据库中没有存储您要删除的数据！\n");printf("\n\n");return 0;
}/*【2】修改数据之修改记录*/
int Amend() {void menu_print_in(void);struct Student *pt1, *pt2, *head;char str_num[20];printf("◎请输入您要修改的学号信息:");scanf("%s", str_num);pt1 = ReadData();pt2 = pt1->next;head = pt1;while(pt2!=NULL) {if(strcmp(pt1->num,str_num)==0) {menu_print_in();scanf("%s%s%s%d%s%s%f%f",pt1->num,pt1->name,pt1->sex,&pt1->age,pt1->phone,pt1->qq,&pt1->cscore,&pt1->escore);WriteData_wb(head);}else if(strcmp(pt2->num,str_num)==0) {menu_print_in();scanf("%s%s%s%d%s%s%f%f",pt2->num,pt2->name,pt2->sex,&pt2->age,pt2->phone,pt2->qq,&pt2->cscore,&pt2->escore);WriteData_wb(head);}pt2 = pt2->next;pt1 = pt1->next;}if(pt2!=NULL)printf("数据库中没有存储您要删除的数据！\n");return 0;
}/*【3】修改数据之整理数据*/
int Neaten() {struct Student *first;struct Student *tail;struct Student *p_min;struct Student *min;struct Student *p;struct Student *head;head = ReadData();first = NULL;while(head!=NULL) {for(p=head,min=head; p->next!=NULL; p=p->next) {if(strcmp(p->next->num,min->num)<0) {p_min = p;min = p->next;}}if(first==NULL) {first = min;tail = min;}else {tail->next = min;tail = min;}if(min==head) {head = head->next;}else {p_min->next = min->next;}}if(first!=NULL) {tail->next = NULL;}head = first;WriteData_wb(head);return 0;
}/*输入写入数据的数量*/
int Creat_num(void) {printf("\n◎请输入您此次要添加的数据个数:");int n;if(scanf("%d", &n)!=1) {printf("\a error!");}return n;
}/*选择将要打开的文件*/
int File_name() {printf("\n◎请输入您想要打开的文件:");if(scanf("%s", filename)!=1)printf("\a error!");return 0;
}/*主菜单*/
void menu(void) {void menu_add(void);void menu_inquire(void);void menu_amend(void);printf("              ╭════════╮              \n");printf("╭══════╣学生管理系统V1.0╠══════╮\n");printf("║            ╰════════╯            ║\n");printf("║   【1】添加数据           【3】修改数据    ║\n");printf("║                                            ║\n");printf("║   【2】查询数据           【4】退出系统    ║\n");printf("║                                            ║\n");printf("╰══════════════════════╯\n");printf("◎请输入功能前的序号进入相应的工具:【   】\b\b");int a = 0;a = getchar();while(a!='1'&&a!='2'&&a!='3'&&a!='4') {printf("error! please input the right number!\n");putchar('\a');getchar();printf("◎请重新输入功能前的序号进入相应的工具:【   】\b\b");a = getchar();}switch(a) {case '1': File_name();menu_add();break;case '2': File_name();menu_inquire();break;case '3': File_name();menu_amend();break;case '4': exit(0);break;}getchar();
}/*二级菜单之添加数据*/
void menu_add(void) {system("cls");getchar();printf("              ╭════════╮              \n");printf("╭══════╣  添加数据方式  ╠══════╮\n");printf("║            ╰════════╯            ║\n");printf("║ 【1】新建文件 【2】增添数据 【3】返回菜单  ║\n");printf("║                                            ║\n");printf("╰══════════════════════╯\n");printf("◎请输入功能前的序号进入相应的工具:【   】\b\b");int a = 0;a = getchar();while(a!='1'&&a!='2'&&a!='3') {printf("error! please input the right number!\n");putchar('\a');getchar();printf("◎请重新输入功能前的序号进入相应的工具:【   】\b\b");a = getchar();}switch(a) {case '1': WriteData_wb(Creat(Creat_num()));printf("\n◎新建文件成功且数据已成功保存◎\n");system("pause");system("cls");menu_add();break;case '2': WriteData_ab(Creat(Creat_num()));printf("\n◎数据已成功添加◎\n");system("pause");system("cls");menu_add();break;case '3': system("cls");getchar();menu();break;}
}/*二级菜单之查询数据*/
void menu_inquire(void) {system("cls");getchar();while(1) {system("cls");printf("              ╭════════╮              \n");printf("╭══════╣  查询数据方式  ╠══════╮\n");printf("║            ╰════════╯            ║\n");printf("║    【1】全量查询         【4】模糊查询     ║\n");printf("║                                            ║\n");printf("║    【2】学号查询         【5】成绩统计     ║\n");printf("║                                            ║\n");printf("║    【3】姓名查询         【6】返回菜单     ║\n");printf("╰══════════════════════╯\n");printf("◎请输入功能前的序号进入相应的工具:【   】\b\b");int a = 0;a = getchar();while(a!='1'&&a!='2'&&a!='3'&&a!='3'&&a!='4'&&a!='5'&&a!='6') {printf("error! please input the right number!\n");putchar('\a');getchar();printf("◎请重新输入功能前的序号进入相应的工具:【   】\b\b");a = getchar();}switch(a) {case '1': Print_inquire_all();system("pause");getchar();break;case '2': Print_inquire_num();system("pause");getchar();break;case '3': Print_inquire_name();system("pause");getchar();break;case '4': Print_inquire_fuzzy();system("pause");getchar();;break;case '5': Print_inquire_stats();system("pause");getchar();break;case '6': system("cls");getchar();menu();break;}}
}/*二级菜单之修改数据*/
void menu_amend(void) {system("cls");getchar();while(1) {system("cls");printf("              ╭════════╮              \n");printf("╭══════╣  修改数据方式  ╠══════╮\n");printf("║            ╰════════╯            ║\n");printf("║    【1】删除记录          【3】整理数据    ║\n");printf("║                                            ║\n");printf("║    【2】修改记录          【4】返回菜单    ║\n");printf("╰══════════════════════╯\n");printf("◎请输入功能前的序号进入相应的工具:【   】\b\b");int a = 0;a = getchar();while(a!='1'&&a!='2'&&a!='3'&&a!='4') {printf("error! please input the right number!\n");putchar('\a');getchar();printf("◎请重新输入功能前的序号进入相应的工具:【   】\b\b");a = getchar();}switch(a) {case '1': Delete();printf("\n\n◎已成功删除指定数据◎\n");system("pause");getchar();break;case '2': Amend();printf("\n\n◎已成功修改指定数据◎\n");system("pause");getchar();break;case '3': Neaten();printf("\n\n◎数据已成功按照学号重新排列◎\n");system("pause");getchar();break;case '4': system("cls");getchar();menu();break;}}
}/*输入输出提示栏*/
void menu_print_in(void) {printf("------------------------------------------------------------------------\n");printf("学号      姓名     性别  年龄    电话         QQ        C    E          \n");printf("------------------------------------------------------------------------\n");
}
void menu_print_out(void) {printf("--------------------------------------------------------------------------\n");printf("学号      姓名     性别  年龄    电话         QQ        C    E    A    S  \n");printf("--------------------------------------------------------------------------\n");
}/*主函数*/
int main(void) {SetConsoleTitle(L"C++学生信息管理系统");menu();return 0; 
}