C语言课程设计，学籍管理系统整理

比眉伴天荒 2023-06-16 10:39 178阅读 0赞

只供参考， 带文件操作

#include <stdio.h>
    #include <conio.h>
    #include <string.h>
    #include <windows.h>
    
    struct student
    {
    	char id[9];
    	char name[20];
    	char sex[3];
    	int math;
    	int langue_c;
    	int English;
    	double aver;
    	char phone[12];
    	struct student *next; 
    };
    
    int m_count=0;
    char m_filename[40]={'k'};
    
    struct student * input_list(struct student *head);
    int output_list(struct student *head);
    int free_all(struct student *head);
    struct student * search_node_by_id(struct student *head);
    int display_node(struct student *p);
    int display_list(struct student *head);
    int search_node_by_name(struct student *head);
    int search_node(struct student *head);
    struct student * delete_node(struct student *head);
    int modify_node(struct student *head);
    int get_average(struct student *head);
    struct student * sort_list_select(struct student *head);
    int output_list1(struct student *head);
    int output_list(struct student *head);
    struct student * output_list2();
    void write_inf_file(struct student *head,char ch,char *str);
    
    int main()
    {
    	int select=-1,t;
    	struct student *head=NULL,*p=NULL;
    	while(select!=0)
    	{
    		printf("\t\t\t\t   ************************************\n");
    		printf("\t\t\t\t   **        ================        **\n");
    		printf("\t\t\t\t   **        学生信息管理系统        **\n");
    		printf("\t\t\t\t   **        1.  录入信息            **\n");
    		printf("\t\t\t\t   **        2.  修改信息            **\n");
    		printf("\t\t\t\t   **        3.  删除信息            **\n");
    		printf("\t\t\t\t   **        4.  查询信息            **\n");
    		printf("\t\t\t\t   **        5.  打印报表            **\n");
    		printf("\t\t\t\t   **        0.  退    出            **\n");
    		printf("\t\t\t\t   ************************************\n");
    		printf("请选择:");
    		scanf("%d",&select);
    		switch(select)
    		{
    			case 1:
    				head=input_list(head);
    				get_average(head);
    				break;
    			case 2:
    				t=modify_node(head);		
    				break;
    			case 3:
    				head=delete_node(head);	
    				break;
    			case 4:
    				t=search_node(head);
    				break;
    			case 5:
    				output_list(head);
    				break;
    			case 0:
    				system("cls");
    				t=free_all(head);
    				printf("\t\t\t\t   (=~ω~=) 感谢使用本程序 (=~ω~=)\n");
    				getch();
    				break;
    			default:			
    				printf("输入错误！请重新输入!\n");	
    				break;	
    		}
    	}
    	free_all(head);
    	return 0;
    }
    
    struct student * input_list(struct student *head)
    {
    	char c,ch;
    	char mid[9];
    	char mname[20];
    	char msex[3];
    	int mmath;
    	int mlangue_c;
    	int mEnglish;
    	char mphone[12];
    	FILE *fp;
    
    	struct student *p=NULL,*q=NULL;
    
    	printf("请输入第%d个学生的信息：\n",m_count+1);
    	printf("学号：");
    	scanf("%s",mid);
    	while(1)
    	{
    		p=head;
    		while(p)
    		{
    			if(strcmp(p->id,mid)==0) break;
    			p=p->next;
    		}
    		if(p!=NULL)
    		{
    			printf("%s学号已存在！请重新输入！\n",mid);
    			printf("学号:");
    			scanf("%s",mid);
    		}
    		if(p==NULL) break;
    	}
    	printf("姓名：");
    	scanf("%s",mname);
    	printf("性别：");
    	scanf("%s",msex);
    	printf("数学成绩：");
    	scanf("%d",&mmath);
    	printf("英语成绩：");
    	scanf("%d",&mEnglish);
    	printf("C语言成绩：");
    	scanf("%d",&mlangue_c);
    	printf("电话号码：");
    	scanf("%s",mphone);
    
    	printf("是否保存：		是：Y  否：N\n");
    	c=getch();
    	if(m_count==0)
    	{
    		while(1)
    		{
    			if(c=='y'||c=='Y')
    			{
    				p=(struct student *)malloc(sizeof(struct student));
    				if(p==NULL)
    				{
    					printf("申请内存失败！按任意键继续！");
    					getch();
    					return head;
    				}
    				head=p;
    				strcpy(p->id,mid);
    				strcpy(p->name,mname);
    				strcpy(p->sex,msex);
    				p->English=mEnglish;
    				p->math=mmath;
    				p->langue_c=mlangue_c;
    				strcpy(p->phone,mphone);
    				p->next=NULL;
    				m_count++;
    				printf("保存完毕！按任意键继续！\n");
    				getch();
    				printf("是否保存到磁盘文件中：		是：Y  否：N\n");
    				ch=getch();
    				while(1)
    				{
    					if(ch=='y'||ch=='Y')
    					{
    						printf("请输入文件名称：");
    						scanf("%s",m_filename);
    						fp=fopen(m_filename,"w");
    						if(fp==NULL)
    						{
    							printf("文件打开失败！按任意键继续！\n");
    							getch();
    							return head;
    						}
    						fprintf(fp,"%s  %s  %s  %d  %d  %d  %.2lf  %s\n",p->id,p->name,p->sex,p->math,p->English,p->langue_c,(p->math+p->English+p->langue_c)/3.0,p->phone);
    						fclose(fp);
    						printf("已保存到%s中!按任意键继续！\n",m_filename);
    						getch();
    						return head;
    					}
    
    					else if(ch=='n'||ch=='N')
    					{
    						printf("没有保存到磁盘文件中！按任意键继续！\n");
    						getch();
    						return head;
    					}
    					else
    					{
    						printf("输入出错！请重新输入！\n");
    						ch=getch();
    					}
    				}						
    			}
    			else if(c=='N'||c=='n') 
    			{
    				printf("没有保存！按任意键继续！\n");
    				getch();
    				return head;
    			}
    			else
    			{
    				printf("输入出错！请重新输入！\n");
    				c=getch();
    			}
    		}
    	}
    
    	while(1)
    	{
    		if(c=='y'||c=='Y')
    		{
    
    			p=(struct student *)malloc(sizeof(struct student));
    			if(p==NULL)
    			{
    				printf("申请内存失败！按任意键继续！");
    				getch();
    				return head;
    			}		
    			strcpy(p->id,mid);
    			strcpy(p->name,mname);
    			strcpy(p->sex,msex);
    			p->English=mEnglish;
    			p->math=mmath;
    			p->langue_c=mlangue_c;
    			strcpy(p->phone,mphone);
    			p->next=NULL;
    			m_count++;
    			q=head;
    			while(1)
    			{		
    				if(q->next==NULL) break;
    				q=q->next;
    			}
    			q->next=p;
    			printf("保存完毕！按任意键继续！\n");
    			getch();
    			printf("是否保存到磁盘文件中：		是：Y  否：N\n");
    			ch=getch();
    			while(1)
    			{
    				if(ch=='y'||ch=='Y')
    				{
    					if(m_filename[0]=='k')
    					{
    						printf("请输入文件名称：");
    						scanf("%s",m_filename);
    					}
    					fp=fopen(m_filename,"a");
    					if(fp==NULL)
    					{
    						printf("文件打开失败！按任意键继续！\n");
    						getch();
    						return head;
    					}
    					fprintf(fp,"%s  %s  %s  %d  %d  %d  %.2lf  %s\n",p->id,p->name,p->sex,p->math,p->English,p->langue_c,(p->math+p->English+p->langue_c)/3.0,p->phone);
    					fclose(fp);
    					printf("已保存到%s中!按任意键继续！\n",m_filename);
    					getch();
    					return head;
    				}
    
    				else if(ch=='n'||ch=='N')
    				{
    					printf("没有保存到磁盘文件中！按任意键继续！\n");
    					getch();
    					return head;
    				}
    				else
    				{
    					printf("输入出错！请重新输入！\n");
    					ch=getch();
    				}
    			}									
    		}
    		else if(c=='N'||c=='n') 
    		{
    			printf("没有保存！按任意键继续！\n");
    			getch();
    			return head;
    		}
    		else
    		{
    			printf("输入出错！请重新输入！\n");
    			c=getch();
    		}
    	}
    }
    
    int output_list_order(struct student *head)
    {
    	struct student *p;
    	p=head;
    	system("cls");
    	if(p==NULL) 
    	{
    		printf("您当前并未录入任何信息！按任意键继续！\n");
    		getch();
    		return 0;
    	}
    	printf("学号\t    姓名\t性别\t数学\t英语\tC语言\t平均分\t电话号码\n");
    	while(1)
    	{
    		printf("%s    ",p->id);
    		printf("%s\t",p->name);
    		printf("%s\t",p->sex);
    		printf("%d\t",p->math);
    		printf("%d\t",p->English);
    		printf("%d\t",p->langue_c);
    		printf("%.2lf\t",p->aver);
    		printf("%s\n",p->phone);
    		p=p->next;
    		if(p==NULL)  break;
    	}
    	printf("显示完毕！按任意键继续！\n");
    	getch();
    	return 0;
    }
    
    int free_all(struct student *head)
    {
    	struct student *p,*q;
    	p=head;
    	if(p==NULL) return 0;
    	q=p->next;
    
    	while(1)
    	{
    		free(p);
    		p=q;
    		if(p==NULL) break;
    		q=q->next;	
    	}
    	return 0;
    }
    
    struct student * search_node_by_id(struct student *head)
    {
    	char mid[9];
    	struct student *p;
    	p=head;
    
    	printf("请输入您要查找的学号：");
    	scanf("%s",mid);
    
    	while(1)
    	{
    		if(strcmp(p->id,mid)==0) break;
    		p=p->next;
    		if(p==NULL) break;
    	}
    
    	if(p==NULL) 
    	{
    		printf("查询失败,该学号不存在！按任意键继续！\n");
    		getch();
    		return NULL;
    	}
    	printf("查询完毕！按任意键继续！\n\n");
    	getch();
    	display_node(p);
    	printf("显示完毕！按任意键继续！\n");
    	getch();
    	return p;
    }
    
    int display_node(struct student *p)
    {
    	printf("学号：%s\n",p->id);
    	printf("姓名：%s\n",p->name);
    	printf("性别：%s\n",p->sex);
    	printf("数学：%d\n",p->math);
    	printf("英语：%d\n",p->English);
    	printf("C语言：%d\n",p->langue_c);
    	printf("平均分：%.2lf\n",p->aver);
    	printf("电话号码：%s\n\n",p->phone);
    	return 0;
    }
    
    int search_node_by_name(struct student *head)
    {
    	int count=0;
    	char mname[20];
    	struct student *mhead=NULL,*p,*q,*k,*y;
    	p=head;
    	printf("请输入您要查找的姓名：");
    	scanf("%s",mname);
    
    	while(1)
    	{
    		if(strcmp(p->name,mname)==0)
    		{
    			if(count==0)
    			{
    				q=(struct student *)malloc(sizeof(struct student));
    				if(p==NULL)
    				{
    					printf("申请内存失败！按任意键继续！");
    					getch();
    					return 0;
    				}
    				strcpy(q->id,p->id);
    				strcpy(q->name,p->name);
    				strcpy(q->sex,p->sex);
    				q->English=p->English;
    				q->math=p->math;
    				q->langue_c=p->langue_c;
    				q->aver=p->aver;
    				strcpy(q->phone,p->phone);
    				q->next=NULL;
    				mhead=q;
    				count++;
    			}
    			else 
    			{
    				k=(struct student *)malloc(sizeof(struct student));
    				if(k==NULL)
    				{
    					printf("申请内存失败！按任意键继续！");
    					getch();
    					return 0;
    				}		
    				strcpy(k->id,p->id);
    				strcpy(k->name,p->name);
    				strcpy(k->sex,p->sex);
    				k->English=p->English;
    				k->math=p->math;
    				k->langue_c=p->langue_c;
    				k->aver=p->aver;
    				strcpy(k->phone,p->phone);
    				k->next=NULL;
    				count++;
    				y=mhead;
    				while(1)
    				{		
    					if(y->next==NULL) break;
    					y=y->next;
    				}
    				y->next=k;
    			}
    		}
    		p=p->next;
    		if(p==NULL) break;
    	}
    	display_list(mhead);
    	free_all(mhead);
    	return 0;
    }
    
    int display_list(struct student *head)
    {
    	struct student *p;
    	p=head;
    
    	if(p==NULL) 
    	{
    		printf("查询失败,该姓名不存在！按任意键继续！\n");
    		getch();
    		return 0;
    	}
    	printf("查询完毕！按任意键继续！\n\n");
    	getch();
    	while(1)
    	{
    		display_node(p);
    		p=p->next;
    		if(p==NULL) break;
    	}
    	printf("显示完毕！按任意键继续！\n");
    	getch();
    	return 0;
    }
    
    int search_node(struct student *head)
    {
    	char c;
    	printf("\n");
    	printf("**********************\n");
    	printf("**==================**\n");
    	printf("**     查询信息     **\n");
    	printf("**     A:按学号     **\n");
    	printf("**     B:按姓名     **\n");
    	printf("**==================**\n");
    	printf("**********************\n");
    	printf("请选择：");
    	scanf("\n%c",&c);
    
    	while(1)
    	{
    		if(c=='A'||c=='a') 
    		{
    			search_node_by_id(head);
    			break;
    		}
    		else if(c=='B'||c=='b') 
    		{
    			search_node_by_name(head);
    			break;
    		}
    		else
    		{
    			printf("输入错误！请重新输入：");
    			scanf("\n%c",&c);
    		}
    	}
    	return 0;
    }
    
    struct student * delete_node(struct student *head)
    {
    	char c,ch;
    	char mid[9];
    	struct student *p,*q;
    	p=head;
    	if(p==NULL)
    	{
    		printf("您当前未存入任何数据，无法删除！按任意键继续！\n");
    		getch();
    		return head;
    	}
    	q=p->next;
    
    	printf("请输入您要删除学生的学号：");
    	scanf("%s",mid);
    
    	if(strcmp(p->id,mid)==0) 
    	{	
    		if(q==NULL)
    		{
    			display_node(p);
    			printf("确认是否删除：		是：Y  否：N\n");
    			c=getch();
    			while(1)
    			{
    				if(c=='y'||c=='Y')
    				{
    					free(p);
    					m_count--;
    					printf("删除完毕！按任意键继续！\n");
    					head=NULL;
    					printf("是否删除文件中的信息：		是：Y  否：N\n");
    					ch=getch();
    					while(1)
    					{
    						if(ch=='y'||ch=='Y') 
    						{
    							FILE *fp;
    							fp=fopen(m_filename,"w");
    							if(fp==NULL)
    							{
    								printf("文件打开失败！");
    								return head;
    							}
    							fclose(fp);
    							printf("文件信息删除完毕！按任意键继续！\n");
    							getch();
    							return head;
    						}
    						else if(c=='n'||c=='N')
    						{
    							printf("删除失败！按任意键继续！\n");
    							getch();
    							return head;
    						}
    						else
    						{
    							printf("输入错误！请重新输入！\n");
    							c=getch();
    						}
    					}
    				}
    				else if(c=='n'||c=='N')
    				{
    					printf("删除失败！按任意键继续！\n");
    					getch();
    					return head;
    				}
    				else 
    				{
    					printf("输入错误！请重新输入！");
    					c=getch();
    				}
    			}
    		}
    
    		display_node(p);
    		printf("确认是否删除：		是：Y  否：N\n");
    		c=getch();
    		while(1)
    		{
    			if(c=='y'||c=='Y')
    			{
    				head=p->next;
    				free(p);
    				m_count--;
    				printf("删除完毕！按任意键继续！\n");
    				getch();
    				printf("是否删除文件中的信息：		是：Y  否：N\n");
    				ch=getch();
    				write_inf_file(head,ch,"删除");
    				return head;
    			}
    		
    			else if(c=='n'||c=='N')
    			{
    				printf("删除失败！按任意键继续！\n");
    				getch();
    				return head;
    			}
    			else
    			{
    				printf("输入错误！请重新输入！\n");
    				c=getch();
    			}
    		}
    	}
    	
    	while(1)
    	{
    		if(strcmp(q->id,mid)==0) break;
    		q=q->next;
    		p=p->next;
    		if(q==NULL) break;
    	}
    	if(q==NULL) 
    	{
    		printf("您并未存入该项信息！按任意键继续！\n");
    		getch();
    		return head;
    	}
    	display_node(q);
    	printf("确认是否删除：		是：Y  否：N\n");
    	c=getch();
    	while(1)
    	{
    		if(c=='y'||c=='Y')
    		{
    			p->next=q->next;
    			free(q);
    			m_count--;
    			printf("删除完毕！按任意键继续！\n");
    			getch();
    			printf("是否删除文件中的信息：		是：Y  否：N\n");
    			ch=getch();
    			while(1)
    			{
    				if(ch=='y'||ch=='Y') 
    				{
    					write_inf_file(head,ch,"删除");
    					return head;
    				}
    				else if(c=='n'||c=='N')
    				{
    					printf("删除失败！按任意键继续！\n");
    					getch();
    					return head;
    				}
    				else
    				{
    					printf("输入错误！请重新输入！\n");
    					c=getch();
    				}
    			}
    		}
    		else if(c=='n'||c=='N')
    		{
    			printf("删除失败！按任意键继续！");
    			getch();
    			return head;
    		}
    		else
    		{
    			printf("输入错误！请重新输入！");
    			c=getch();
    		}
    	}
    }
    
    int modify_node(struct student *head)
    {
    	char mid[9],ch;
    	struct student *p,*q;
    	p=head;
    	if(p==NULL)
    	{
    		printf("您当前并未录入任何信息，无法修改！按任意键继续！\n");
    		getch();
    		return 0;
    	}
    
    	printf("请输入您要修改学生的学号：");
    	scanf("%s",mid);
    
    	while(1)
    	{
    		if(strcmp(p->id,mid)==0) break;
    		p=p->next;
    		if(p==NULL) break;
    	}
    
    	if(p==NULL)
    	{
    		printf("您并未存入该项信息！按任意键继续！\n");
    		getch();
    		return 0;
    	}
    
    	printf("原信息如下：\n");
    	display_node(p);
    	printf("新学号：");
    	scanf("%s",p->id);
    	while(1)
    	{
    		q=head;
    		while(q)
    		{
    			if(strcmp(q->id,p->id)==0&&q!=p) break;
    			q=q->next;
    		}
    		if(q!=NULL)
    		{
    			printf("%s学号已存在！请重新输入！\n",p->id);
    			printf("新学号:");
    			scanf("%s",p->id);
    		}
    		if(q==NULL) break;
    	}
    
    	printf("新姓名：");
    	scanf("%s",p->name);
    	printf("新性别：");
    	scanf("%s",p->sex);
    	printf("新数学成绩：");
    	scanf("%d",&p->math);
    	printf("新英语成绩：");
    	scanf("%d",&p->English);
    	printf("新C语言成绩：");
    	scanf("%d",&p->langue_c);
    	p->aver=(p->English+p->langue_c+p->math)/3.0;
    	printf("新电话号码：");
    	scanf("%s",p->phone);
    	printf("修改完毕！按任意键继续！\n");
    	getch();
    	printf("是否保存到文件中：		是：Y  否：N\n");
    	ch=getch();
    	while(1)
    	{
    		if(ch=='y'||ch=='Y')
    		{
    			write_inf_file(head,ch,"修改");
    			return 0;
    		}
    		else if(ch=='n'||ch=='N')
    		{
    			printf("保存到文件中失败！按任意键继续！\n");
    			getch();
    			return 0;
    		}
    		else
    		{
    			printf("输入出错！请重新输入！\n");
    			ch=getch();
    		}
    	}
    }
    
    int get_average(struct student *head)
    {
    	struct student *p;
    	p=head;
    
    	if(p==NULL) return 0;
    
    	while(1)
    	{
    		p->aver=(p->English+p->math+p->langue_c)/3.0;
    		p=p->next;
    		if(p==NULL) break;
    	}
    	return 0;
    }
    
    struct student * sort_list_select(struct student *head)
    {
    	struct student *headt=NULL,*t;
    	struct student *p,*q;
    
    	if(head==NULL||head->next==NULL) return head;
    
    	p=head;
    	t=headt=q=(struct student *)malloc(sizeof(struct student));
    	strcpy(q->id,p->id);
    	strcpy(q->name,p->name);
    	strcpy(q->sex,p->sex);
    	q->English=p->English;
    	q->math=p->math;
    	q->langue_c=p->langue_c;
    	q->aver=p->aver;
    	strcpy(q->phone,p->phone);
    	q->next=NULL;
    	p=p->next;
    	while(1)
    	{
    		q=(struct student *)malloc(sizeof(struct student));
    		strcpy(q->id,p->id);
    		strcpy(q->name,p->name);
    		strcpy(q->sex,p->sex);
    		q->English=p->English;
    		q->math=p->math;
    		q->langue_c=p->langue_c;
    		q->aver=p->aver;
    		strcpy(q->phone,p->phone);
    		q->next=NULL;
    		t->next=q;
    		p=p->next;
    		t=t->next;
    		if(p==NULL) break;
    	}
    
    	t=(struct student *)malloc(sizeof(struct student));
    
    	for(p=headt;p!=NULL;p=p->next)
    	{
    		for(q=p->next;q!=NULL;q=q->next)
    		{
    			if(p->aver<q->aver)
    			{
    				strcpy(t->id,p->id);
    				strcpy(t->name,p->name);
    				strcpy(t->sex,p->sex);
    				t->English=p->English;
    				t->math=p->math;
    				t->langue_c=p->langue_c;
    				t->aver=p->aver;
    				strcpy(t->phone,p->phone);
    				strcpy(p->id,q->id);
    				strcpy(p->name,q->name);
    				strcpy(p->sex,q->sex);
    				p->English=q->English;
    				p->math=q->math;
    				p->langue_c=q->langue_c;
    				p->aver=q->aver;
    				strcpy(p->phone,q->phone);
    				strcpy(q->id,t->id);
    				strcpy(q->name,t->name);
    				strcpy(q->sex,t->sex);
    				q->English=t->English;
    				q->math=t->math;
    				q->langue_c=t->langue_c;
    				q->aver=t->aver;
    				strcpy(q->phone,t->phone);
    			}
    		}
    	}
    	free(t);
    	return headt;
    }
    
    int output_list1(struct student *head)
    {
    	int t;
    	char c;
    	struct student *headt=NULL;
    
    	printf("\n");
    	printf("******************************\n");
    	printf("**==========================**\n");
    	printf("**         打印报表         **\n");
    	printf("**         A:按输入顺序     **\n");
    	printf("**         B:按均分高低     **\n");
    	printf("**==========================**\n");
    	printf("******************************\n");
    	printf("请选择：");
    	scanf("\n%c",&c);
    
    	while(1)
    	{
    		if(c=='A'||c=='a') 
    		{
    			output_list_order(head);
    			break;
    		}
    		else if(c=='B'||c=='b') 
    		{
    			headt=sort_list_select(head);
    			t=output_list_order(headt);
    			free_all(headt);
    			break;
    		}
    		else
    		{
    			printf("输入错误！请重新输入：\n");
    			scanf("\n%c",&c);
    		}
    	}
    	return 0;
    }
    
    int output_list(struct student *head)
    {
    	struct student *head1=NULL;
    	char c;
    	printf("\n");
    	printf("**************************************\n");
    	printf("**==================================**\n");
    	printf("**             打印报表             **\n");
    	printf("**        A:打印本次录入信息        **\n");
    	printf("**        B:打印指定文件信息        **\n");
    	printf("**==================================**\n");
    	printf("**************************************\n");
    	printf("请选择：");
    	scanf("\n%c",&c);
    	while(1)
    	{
    		if(c=='a'||c=='A')
    		{
    			output_list1(head);
    			return 0;
    		}
    		else if(c=='b'||c=='B')
    		{
    			head1=output_list2();
    			if(head1==NULL) 
    			{
    				printf("当前文件无任何信息！按任意键继续！\n");
    				getch();
    				return 0;
    			}
    			output_list1(head1);
    			free_all(head1);
    			return 0;
    		}
    		else
    		{
    			printf("输入错误！请重新输入！\n");
    			scanf("\n%c",&c);
    		}
    	}
    }
    
    struct student * output_list2()
    {
    	int count=0;
    	FILE *fp;
    	char mfilename[40],c;
    	struct student *head=NULL,*p,*q;
    	printf("请输入文件名（包含文件路径）：");
    	scanf("%s",mfilename);
    	fp=fopen(mfilename,"r");
    	if(fp==NULL)
    	{
    		printf("文件打开失败！按任意键继续！\n");
    		getch();
    		return NULL;
    	}
    
    	while(1)
    	{
    		if(count==0)
    		{
    			c=fgetc(fp);
    			if(c==EOF) return NULL; 
    			head=(struct student *)malloc(sizeof(struct student));
    			fscanf(fp,"%s  %s  %s  %d  %d  %d  %lf  %s\n",head->id,head->name,head->sex,&head->math,&head->English,&head->langue_c,&head->aver,head->phone);
    			head->next=NULL;
    			count++;
    			c=fgetc(fp);
    			if(c==EOF) break; 			
    		}
    		p=(struct student *)malloc(sizeof(struct student));
    		fscanf(fp,"%s  %s  %s  %d  %d  %d  %lf  %s\n",p->id,p->name,p->sex,&p->math,&p->English,&p->langue_c,&p->aver,p->phone);
    		p->next=NULL;
    		q=head;
    		while(1)
    		{
    			if(q->next==NULL) break;
    			q=q->next;
    		}
    		q->next=p;
    		count++;
    		if(feof(fp)) 
    		{
    			fclose(fp);
    			break;
    		}
    	}
    		return head;
    }
    
    void write_inf_file(struct student *head,char ch,char *str)
    {
    	struct student *p;
    	FILE *fp;
    	while(1)
    	{
    		if(ch=='y'||ch=='Y')
    		{
    			fp=fopen(m_filename,"w");
    			if(fp==NULL)
    			{
    				printf("文件打开失败！按任意键继续！\n");
    				getch();
    				return ;
    			}
    			p=head;
    			while(1)
    			{
    				fprintf(fp,"%s  %s  %s  %d  %d  %d  %.2lf  %s\n",p->id,p->name,p->sex,p->math,p->English,p->langue_c,(p->math+p->English+p->langue_c)/3.0,p->phone);
    				p=p->next;
    				if(p==NULL) break;
    			}
    			fclose(fp);
    			printf("文件信息%s完毕！按任意键继续！\n",str);
    			getch();
    			return ;
    		}
    		else if(ch=='n'||ch=='N')
    		{
    			printf("文件信息%s失败！按任意键继续！\n",str);
    			getch();
    			return ;
    		}
    		else
    		{
    			printf("输入错误！请重新输入！\n");
    			ch=getch();
    		}
    	}
    }