新分类又一次上线了……虽然还是很菜的东西……
老师让我们做的一个小程序，稍微多加了一点功能，然后变成了一个勉强能用的软件了……
因为比较简单，先直接上代码到时候看心情补讲解……
//database.c（主文件）中的内容
#include"sinon_database_fuction.h"
#pragma warning(disable:4996)
int main()
{
//执行登陆操作
int a;
while (1)
{
a = login();
if (a == 1)
break;
else if (a == 0)
return 0;
}
//检测数据文件
detect();
//用于存放控制指令
int control = 0, result = 0;
//死循环确保程序运行
while (1)
{
//登陆后菜单界面
control = menu();
switch (control)
{
default:
puts("无效的输入！");
break;
case 1:
result = search();
break;
case 2:
result = edit();
break;
case 3:
result = del();
break;
case 4:
result = add();
break;
case 5:
result = sort();
break;
case 6:
puts("感谢使用！");
Sleep(1000);
return 0;
}
}
} //sinon_database_fuction.h中的内容
#pragma warning(disable:4996)
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <Windows.h>
#include <string.h>
#include <time.h>
#define PASSWORD "sinon"
//定义数据结构体
struct Student
{
char ID[20];
char name[30];
int age;
double score;
};
int cmp(struct Student *a, struct Student *b);
//登陆函数
int login()
{
char password[30] = "00000000000000000000000000000", ch = 0;
puts("欢迎使用Sinon的学生信息管理系统！");
puts("请先登录,或输入exit退出：");
scanf("%s", password);
if (strcmp(password, PASSWORD) == 0)
{
puts("登陆成功！");
return 1;
}
else if (strcmp(password, "exit") == 0)
{
return 0;
}
else
{
puts("密码错误,请重试！");
Sleep(1000);
return -1;
}
}
//数据库检测函数
void detect()
{
FILE *fp;
fp = fopen("D:/Info.dat", "r");
int control = 0;
if (!fp)
{
int i = 1;
while (i)
{
puts("数据库文件还未创建，需要创建一个吗？(是：1，否：2)");
scanf("%1d", &control);
switch (control)
{
default:
puts("你输的啥玩意？请输1或2");
break;
case 1:
fp = fopen("D:/Info.dat","w+");
puts("文件创建成功！");
fprintf(fp, "%lf,%d,%s\n%s\n", 100.0,19,"test","B0000000000");
i = 0;
break;
case 2:
puts("不创建你运行这程序干啥？回去选1。");
break;
}
}
}
else
{
puts("数据库已被成功读取。");
}
fclose(fp);
}
//菜单函数
int menu()
{
while (1)
{
int control = 0;
puts("*******************MENU***********************");
puts("*1.数据查询 *");
puts("*2.数据修改 *");
puts("*3.数据删除 *");
puts("*4.数据添加 *");
puts("*5.排名查询 *");
puts("*6.系统退出 *");
puts("*请输入菜单前的数字来执行指令 *");
puts("**********************************************");
scanf("%1d", &control);
if ((control > 0) & (control < 7))
{
return control;
}
else
{
puts("无效的命令，请重试！");
Sleep(1000);
system("cls");
}
}
}
//数据查询函数
int search()
{
system("cls");
FILE *fp;
struct Student read[1000];
int count = 0;
fp = fopen("D:/Info.dat", "rt");
for (int i = 0; i <= 999; i++)
{
if (feof(fp))
{
count--;
break;
}
fscanf(fp, "%lf,%d,%s%s",&read[i].score, &read[i].age, read[i].name, read[i].ID);
count++;
}
if (count == 0)
{
puts("当前暂无数据！");
fclose(fp);
return 0;
}
puts("|--------------------------------------------------------------------------|");
puts("| 序号 ID name age score |");
for (int i = 0; i <= (count-1); i++)
{
printf("| %4d %20s %20s %2d %.3f |\n",i,read[i].ID , read[i].name, read[i].age, read[i].score);
}
puts("|--------------------------------------------------------------------------|");
fclose(fp);
return 0;
}
//数据修改函数
int edit()
{
system("cls");
FILE *fp;
struct Student read[1000],edit;
int count = 0, target = -1;
fp = fopen("D:/Info.dat", "rt");
for (int i = 0; i <= 999; i++)
{
if (feof(fp))
{
count--;
break;
}
fscanf(fp, "%lf,%d,%s%s", &read[i].score, &read[i].age, read[i].name, read[i].ID);
count++;
}
puts("请输入你需要修改的条目序号：");
scanf("%5d", &target);
if (target < 0 || target >= count)
{
puts("没有查询到此序号的条目，请重试！");
fclose(fp);
return 0;
}
puts("请输入该学生的名字：");
scanf("%20s", &edit.name);
puts("请输入该学生的年龄：");
scanf("%2d", &edit.age);
puts("请输入该学生的ID:");
scanf("%s", &edit.ID);
puts("请输入该学生的成绩：");
scanf("%lf", &edit.score);
strcpy(read[target].name, edit.name);
strcpy(read[target].ID, edit.ID);
read[target].age = edit.age;
read[target].score = edit.score;
fclose(fp);
fp = fopen("D:/Info.dat", "w");
for (int i = 0; i <= (count - 1); i++)
{
fprintf(fp, "%lf,%d,%s\n%s\n", read[i].score, read[i].age, read[i].name, read[i].ID);
}
puts("数据修改成功！");
fclose(fp);
Sleep(1000);
return 0;
}
//数据删除函数
int del()
{
system("cls");
FILE *fp;
struct Student read[1000];
int count = 0, target = -1;
fp = fopen("D:/Info.dat", "rt");
for (int i = 0; i <= 999; i++)
{
if (feof(fp))
{
count--;
break;
}
fscanf(fp, "%lf,%d,%s%s", &read[i].score, &read[i].age, read[i].name, read[i].ID);
count++;
}
puts("请输入你需要删除的条目ID：");
scanf("%100d", &target);
if (target < 0 || target >= count)
{
puts("没有查询到此ID的条目，请重试！");
fclose(fp);
return 0;
}
fclose(fp);
fp = fopen("D:/Info.dat", "w");
for (int i = 0; i <= (count - 1); i++)
{
if (i == target)
continue;
fprintf(fp, "%lf,%d,%s\n%s\n", read[i].score, read[i].age, read[i].name, read[i].ID);
}
puts("数据删除成功！");
fclose(fp);
return 0;
}
//数据增加函数
int add()
{
system("cls");
FILE *fp;
struct Student edit;
fp = fopen("D:/Info.dat", "a+");
puts("请输入该学生的名字：");
scanf("%20s", &edit.name);
puts("请输入该学生的年龄：");
scanf("%2d", &edit.age);
puts("请输入该学生的ID:");
scanf("%s", &edit.ID);
puts("请输入该学生的成绩：");
scanf("%lf", &edit.score);
fprintf(fp, "%lf,%d,%s\n%s\n", edit.score, edit.age, edit.name, edit.ID);
puts("数据增加成功！");
fclose(fp);
return 0;
}
//成绩排名函数
int sort()
{
system("cls");
FILE *fp;
struct Student read[1000];
int count = 0;
fp = fopen("D:/Info.dat", "rt");
for (int i = 0; i <= 999; i++)
{
if (feof(fp))
{
count--;
break;
}
fscanf(fp, "%lf,%d,%s%s", &read[i].score, &read[i].age, read[i].name, read[i].ID);
count++;
}
qsort(read, count, sizeof(read[0]), cmp);
puts("|--------------------------------------------------------------------------|");
puts("| 排名 ID name age score |");
for (int i = 0; i <= (count - 1); i++)
{
printf("| %4d %20s %20s %2d %.3f |\n", i+1, read[i].ID, read[i].name, read[i].age, read[i].score);
}
puts("|--------------------------------------------------------------------------|");
fclose(fp);
return 0;
}
//比较函数
int cmp(struct Student *a, struct Student *b)
{
return (a->score) < (b->score) ? 1 : -1;
}
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