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【C】成绩管理系统
作者:Vurteon / 发布于2013/10/24/ 769

	//下面三行谁包含头文件
	#include<stdio.h>
	#include<windows.h>
	#include<stdlib.h>

	//下面是宏定义，便于修改也可以简化代码
	#define enter "\n\n\n\n\n"
	#define space " "
	#define choice "Please enter your choice:"
	#define land2 " ------------------------Wellcome to use the system----------------------------\n"
	#define land1 " ----------------------------------LAND----------------------------------------\n"
	#define ShowHeader1 "------------------------------------STUDENT------------------------------------\n"
	#define ShowHeader2 "| number | name | C | Math | Eng | sum | ave | minci|\n"
	#define ShowHeader4 "| number | name | C | Math | Eng | sum | ave | pro |\n"
	#define ShowHeader3 "|---------------|---------------|------|--------|-------|-------|------|------|\n"
	#define FORMAT " | %-10s |%-15s|%4d|%4d|%4d| %4d | %.2f |%4d |\n"

	FILE *fp,*fp1; //定义文件指针

	struct ID //用户名ID结构体
	{
	char IDCard[30];
	};

	//函数声明
	void Wellcome(void);
	int Land();
	int GetNumber(void);
	void Wrong(void);
	int CreatNewUser();
	char*EnterNumber();
	void Style();
	int EnterSystem(char []);
	void menu();
	void NewRecord(char []);
	void SearchRecord(char []);
	void ScanRecord(char str[]);
	void Reback();
	int Sum(int C,int Math,int Eng);
	float Ave(int sum);
	int Sort(char str[]);
	//void quick_sort(student sort[] , int l, int r);

	//学生学习成绩信息结构体
	typedef struct student
	{
	char number[20];
	char name[10];
	int unsigned C;
	int unsigned math;
	int unsigned eng;
	struct student *next;
	}*stu;

	//便利函数声明
	struct student *BianLi(void);

	
	下面是主函数体

	/******这是一个学生分数管理系统，主要功能是**********
	*******记录，查看，删除等学生分数的信息。函数命名********
	*******都是以功能来命名的，可以方便的找到相关功能*********
	*******的代码。
	****************学生分数管理系统****************
	******************编写者：康乐******************
	******************编写日期：2012 12 8***********
	*/

	#include"KLC.h" //包含头文件

	void main(void)
	{
	system("color 01");
	Land();
	}

	int LandSence() //将界面和数据操作分开，界面显示函数
	{
	int number;
	system("cls"); //windows中的清屏函数
	printf(enter);
	printf(land1);
	printf("\n\n");
	printf(space);
	printf("1.creat a new ID\n\n"); //创建新的ID
	printf(space);
	printf("2.I already have a ID\n\n"); //如果用户有ID ，则直接输入选项进入
	printf(" ");
	printf(choice);
	number = GetNumber(); //用户输入选择
	return number;
	}


	/*函数功能，判断用户的输入，并进入相应
	的流程
	*/
	int Land()
	{
	int number = LandSence();
	if(1 == number)
	 CreatNewUser();
	else if(2 == number)
	 EnterNumber();
	else
	{
	 Wrong();
	 getchar();
	 Land();
	}
	return 0;
	}

	/*因为有很多的地方需要用户输入相应的选项
	*所以将用户输入单独的用一个函数写出,方便其他
	*函数的调用.
	*/
	int GetNumber()
	{
	int number = 0;
	if(!scanf("%d",&number))
	 Wrong();
	return number;
	}

	/*
	*检测用户输入是否早已存在
	*/
	int CheckNumber(char str[])
	{
	ID *output,put;
	output = (ID*)malloc(sizeof(ID));
	fp = (fopen("enter","rb"));
	while((fread(output,sizeof(put),1,fp)) == 1) // 在文件中查询用户名
	{
	 if(strcmp(output->IDCard,str) == 0)
	 {
	 printf("The ID was used,Please choice other ID!");
	 fclose(fp);
	 getchar();getchar();
	 system("cls");
	 return Land();
	 }
	}
	fclose(fp);
	 return 0;
	}

	void Wrong() /*输出按键错误信息*/
	{
	printf("\n\n\n***********Error:input has wrong! press any key to continue**********\n");
	getchar();
	}

	void EnterSystemSence() //界面函数
	{
	system("CLS");
	printf(enter);
	printf(land1);
	printf(space);
	printf("Please enter your ID:");
	}

	/*函数功能:提示用户输入自己已经有的ID，进入相应的系统,并将
	*用户的ID作为参数传递,以便其它相关函数的使用.
	*/
	char *EnterNumber()
	{
	EnterSystemSence();
	char IDcard[30];
	ID *output,put;
	output = (ID*)malloc(sizeof(ID));
	int ID = 0,number = 0;
	scanf("%s",IDcard); // 输入用户名
	if((fp=fopen("enter","rb")) == NULL)
	 exit(1);
	while((fread(output,sizeof(put),1,fp)) == 1) // 在文件中查询用户名
	{
	 if(strcmp(output->IDCard,IDcard) == 0)
	 {
	 number++;
	 printf(" ID is right ! press anykey to enter system !");
	 if((fp1 = fopen(IDcard,"ab")) == NULL) // 打开用户指定文件
	 {
	 exit(1);
	 }
	 fclose(fp1);
	 getchar();
	 getchar();
	 EnterSystem(IDcard); // 正式进入用户系统
	 }
	}
	if(0 == number)
	 {
	 fclose(fp);
	 printf("\nNo Such a ID ,You can creat a New ID!"); //若果没有ID 则提示用户从新登陆或创建新的ID
	 getchar();getchar();
	 Land();
	}
	getchar();
	fclose(fp);
	return IDcard;
	}
	/*
	*创建用户的ID,并向文件中写入ID数据
	*并储存
	*/

	int CreatNewUser() // 创建新用户ID
	{
	ID *input;
	input = (ID*)malloc(sizeof(ID)); // 在静态区申请内存空间
	if((fp=fopen("enter","ab")) == NULL)
	{
	 printf("Wrong");
	 exit(1);
	}
	Style();
	printf("Please enter your new ID:");
	scanf("%s",input->IDCard);
	CheckNumber(input->IDCard);
	fwrite(input,sizeof(ID),1,fp); // 向文件中写入用户创建的ID信息
	fclose(fp);
	printf("\n\n 成功创建ID：%s",input->IDCard);
	return 0;
	}

	void Style(void) //一个公用的函数
	{
	printf(enter);
	printf(space);
	}

	int EnterSystem(char str[])
	{
	system("color 01");
	menu(); // 列举用户选项
	int number = GetNumber();
	switch(number) //使用switch进行用户的输入检查
	{
	case 1:NewRecord(str);break;
	case 2:SearchRecord(str);break;
	case 3:ScanRecord(str);break;
	case 4:EnterNumber();break;
	case 5:break;
	default:
	 break;
	}
	return 0;
	}
	/* 用户选项列举函数 */
	void menu() //主界面
	{
	system("cls");
	printf(enter);
	printf(land2);
	printf("\n"); //提供了五个选项，删除和修改在search中实现
	printf(" 1.Iput new record 2.serch record\n\n");
	printf(" 3.scan record 4.Login system\n\n");
	printf(" 5.Quit\n\n");
	printf(" Please enter your choice:");

	}
	int CheckRecord(char str[],char number[])
	{
	if((fp=fopen(str,"rb")) == NULL)
	{
	 printf("Wrong");
	 exit(1);
	}
	student *Check;
	Check=(student*)malloc(sizeof(student));
	while((fread(Check,sizeof(student),1,fp)) == 1) // 在文件中查询Record
	{
	 if((strcmp(Check->number,number) == 0))
	 {
	 printf("The student Record was exist!Press any key to return Menu.");
	 getchar();getchar();
	 system("cls");
	 fclose(fp);
	 return EnterSystem(str);
	 }
	}
	fclose(fp);
	return 0;
	}

	/*新建学生信息，采用单链表进行获得用户输入数据*/
	void NewRecord(char str[])
	{
	system("cls");
	printf(land2);
	char c;
	stu L;
	student *now ,*later,*read;
	L=(student*)malloc(sizeof(student)); //申请头结点
	L -> next = NULL;
	now = L;
	while(true){
	 later = (student*)malloc(sizeof(student));
	 printf("Please enter number:");
	 scanf("%s",later->number); //这里由于是数组 所以名字就是地址
	 CheckRecord(str,later->number);
	 printf("\nPlease enter name:");
	 scanf("%s",later->name);
	 printf("\nPlease enter C record:");
	 scanf("%d",&later->C); //这里的later->C是变量！！
	 printf("\nPlease enter math record:");
	 scanf("%d",&later->math);
	 printf("\nPlease enter eng record:");
	 scanf("%d",&later->eng);
	 now ->next = later; //交换节点
	 now = later;
	 printf(" Go on wrinting ? (Y/N)");
	 if( (c = getchar()) == 'N'||(c = getchar()) == 'n' ) //提示用户是否继续输入
	 break;
	 printf("\n");
	}
	now->next = NULL;
	read = L->next; //从头节点开始遍历，向文件中写入信息
	if((fp=fopen(str,"ab")) == NULL)
	{
	 printf("Wrong");
	 exit(1);
	}
	while(read != NULL){ //向文件中写入信息
	 fwrite(read,sizeof(student),1,fp);
	 read = read ->next;
	}
	fclose(fp);
	if(c == 'n')
	 EnterSystem(str);
	}
	void SearchSence()
	{
	system("CLS");
	printf("Please enter one of<number,name>\n");
	printf(" Please enter your order:");
	}

	/* 搜索学生信息，使用线性搜索的方法，因为是字符串，所以没法用二分查找*/
	void SearchRecord(char str[])
	{
	fp = fopen(str,"ab+");
	char in[20];
	int i = 0,c = 0;
	student *compare,*compare1,*write,*L = BianLi();
	SearchSence();
	scanf("%s",in);
	compare = L->next;
	while(compare != NULL){
	 if(strcmp(compare->number,in) == 0 || strcmp(compare->name,in) == 0)
	 {
	 int sum = Sum(compare->C,compare->math,compare->eng);
	 int ave = Ave(sum);
	 printf("\nstduent number:%s",compare->number);
	 printf("\nstudent name:%s",compare->name);
	 printf("\nC point:%d",compare->C);
	 printf("\nMath point:%d",compare->math);
	 printf("\nEng point:%d",compare->eng);
	 printf("\nstudent Sum:%d\nstudent Ave:%d",sum,ave);
	 printf("\n1.Change student imformation 2.Del student information 3.exit");
	 printf("\n\n Enter your choice :");
	 c = GetNumber();
	 if(1 == c) //修改学生成绩
	 {
	 printf("\nPlease change C record:");
	 scanf("%d",&compare->C);
	 printf("\nPlease change math record:");
	 scanf("%d",&compare->math);
	 printf("\nPlease change eng record:");
	 scanf("%d",&compare->eng);
	 }
	 else if(2 == c) //删除学生成绩
	 {
	 if(L->next == compare)
	 L->next = compare->next;
	 else
	 compare1->next = compare->next;
	 printf("Done!");
	 getchar();getchar();
	 }
	 else if(3 == c) //退出查找系统
	 EnterSystem(str);
	 }
	 compare1 = compare;
	 compare = compare->next;
	}
	fclose(fp);
	fp = fopen(str,"wb+");
	write = L->next;
	while(write != NULL)
	{
	 fwrite(write,sizeof(student),1,fp);
	 write = write->next;
	}
	fclose(fp);
	if(0 == c)
	{
	 printf("There is no the student information!Press any key to return.");
	 getchar();getchar();
	}
	EnterSystem(str);
	}

	void ScanRecordSence() //界面函数
	{
	system("CLS");
	printf(ShowHeader1);
	printf(ShowHeader2);
	printf(ShowHeader3);
	}

	void ScanRecordSence2() //界面函数
	{
	system("CLS");
	printf(ShowHeader1);
	printf(ShowHeader4);
	printf(ShowHeader3);
	}

	int ScanUnpass()
	{
	int num;
	printf("\n 1.Unpassn student 2.Pass student 3.Exit\n");
	printf(" printf enter your older;");
	num = GetNumber();
	if(1 != num&& 2 != num&& 3 != num)
	 Wrong();
	return num;
	}

	/* 输出所有学生信息，而且统计几及格数，计算出及格率，而且给出排名 */
	void ScanRecord(char str[])
	{
	Sort(str); // 对文件的内容进行排序
	ScanRecordSence();
	int sum,xueci = 0,num;
	int MathF = 0,CF = 0,EngF = 0;
	float ave;
	stu read;
	if((fp=fopen(str,"rb")) == NULL)
	 exit(1);
	stu L = BianLi();
	read = L->next;
	while(read != NULL){
	 if(read->C >= 60)
	 CF++;
	 if(read->eng >= 60)
	 EngF++;
	 if(read->math >= 60)
	 MathF++;
	 sum = Sum(read->C,read->math,read->math);
	 ave = Ave(sum);
	 xueci++;
	 printf("ssd%8d%8d%8d%9.2f%5d\n",read->number,read->name,read->C,read->math,read->eng,sum,ave,xueci);
	 read = read->next;
	}
	printf("\n\n C has %d students pass!",CF);printf(" Math has %d students pass!",MathF);printf(" Eng has %d students pass!\n",EngF);
	printf("The pass of C:%d%%\n\n",100*CF/xueci);printf("The pass of Math:%d%%\n\n",100*MathF/xueci);printf("The pass of Eng:%d%%\n\n",100*EngF/xueci);
	/*下面是查看未及格人员*/
	num = ScanUnpass();
	if(1 == num)
	{
	 system("color 04");
	 int a = 0,put = 0,i = 0;
	 char Pro[3];
	 system("cls");
	 ScanRecordSence2();
	 read = L->next;
	 while(read != NULL){
	 i = 0;
	 if(read->C < 60)
	 {
	 a = 1;
	 Pro[i] = 'C';
	 i++;
	 }
	 if(read->eng < 60)
	 {
	 a = 1;
	 Pro[i] = 'E';
	 i++;
	 }
	 if(read->math < 60)
	 {
	 a = 1;
	 Pro[i] = 'M';
	 i++;
	 }
	 if(1 == a)
	 {
	 sum = Sum(read->C,read->math,read->math);
	 ave = Ave(sum);
	 printf("ssd%8d%8d%8d%9.2f ",read->number,read->name,read->C,read->math,read->eng,sum,ave);
	 while(put < i)
	 {
	 printf("%c ",Pro[put]);
	 put++;
	 }
	 put = 0;
	 printf("\n");
	 }
	 read = read->next;
	}
	}
	else if(2 == num)
	{
	 system("cls");
	 ScanRecordSence2();
	 read = L->next;
	 while(read != NULL){
	 if(read->math >= 60&&read->eng >= 60&&read->C >= 60)
	 {
	 sum = Sum(read->C,read->math,read->math);
	 ave = Ave(sum);
	 printf("ssd%8d%8d%8d%9.2f PASS",read->number,read->name,read->C,read->math,read->eng,sum,ave);
	 printf("\n");
	 }
	 read = read->next;
	}
	}
	else if(3 == num)
	 ;
	printf(" press enter to return !");
	fclose(fp);
	getchar();getchar();
	EnterSystem(str);
	}

	/*因为有好几个地方需要用到L，所有就单独的将其遍历，返回头结点的地址*/
	struct student *BianLi()
	{
	student *now ,*later,*L;
	L=(student*)malloc(sizeof(student));
	now = L;
	later = (student*)malloc(sizeof(student));
	while((fread(later,sizeof(student),1,fp)) == 1) //建立一个带有数据的链表
	{
	 now ->next = later;
	 now = later;
	 later = (student*)malloc(sizeof(student));
	}
	now->next = NULL;
	return L;
	}

	/*计算学生总分*/
	int Sum(int C,int Math,int Eng)
	{
	int sum = (C + Math + Eng);
	return sum;
	}

	/*计算学生的平均成绩*/
	float Ave(int sum)
	{
	float ave = (sum/3.0);
	return ave;
	}

	/*使用冒泡对学生成绩进行排序*/
	int Sort(char str[])
	{
	int count = 0,i = 0,j = 0,m = 0;
	struct student put[100];
	student stu;
	student *now = put;
	if((fp=fopen(str,"rb+")) == NULL)
	 exit(1); //打开失败处理
	while(fread(&put[i],sizeof(student),1,fp) == 1)
	{
	 count++;
	 i++;
	}
	for(j = 0 ;j < count ;j++)
	{
	 for(int q = 0 ; q < count - j ;q++)
	 {
	 int num1 = Sum(put[q].C,put[q].eng,put[q].math);
	 int num2 = 0;
	 if((q+1) < count-j)
	 num2 = Sum(put[q+1].C,put[q+1].eng,put[q+1].math);
	 //if(strcmp(put[q].number,put[q+1].number) > 0) //原来考虑到学生的利益，按学号排序，现在....没办法了..
	 if(num1 < num2)
	 {
	 stu = put[q];
	 put[q] = put[q+1];
	 put[q+1] = stu;

	 }
	 }
	}
	fseek(fp,0,0);
	for(j = 0; j < i; j++)
	{
	 fwrite(&put[j],sizeof(student),1,fp);
	}
	fclose(fp);
	return 0;
	}
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