闫晋梁（宿舍管理系统）

[mythologicalwarrior]

#include<stdio.h>
#include<stdlib.h>
struct student
{
	char name[20];
	int num;
	int age;
	char sex[20];
	int snum;
	int cnum;
	struct student *next;
};

struct student *creat()//创建链表
{
	struct student *head=NULL;
	struct student *cut,*end;
	end=cut=(struct student *)malloc(sizeof(struct student));
	scanf("%s %d %d %s %d %d",cut->name,&cut->num,&cut->age,cut->sex,&cut->snum,&cut->cnum);
	while(cut->num>0)
	{
		if(head==NULL)
			head=cut;
		else
		{
			end->next=cut;
			end=cut;
			cut=(struct student*)malloc(sizeof(struct student));
			scanf("%s %d %d %s %d %d",cut->name,&cut->num,&cut->age,cut->sex,&cut->snum,&cut->cnum);
		}
	}
	end->next=NULL;
	return(head);
}

void print(struct student*head)//输出链表
{
	struct student *a;
	a=head;
	if(a==NULL)
	{
		printf("这是空的");
		exit(1);
	}
	else
	   while(a!=0)
		{
			printf("%s %d %d %s %d %d\n",a->name,a->num,a->age,a->sex,a->snum,a->cnum);
			a=a->next;
		}
}
 
void chaxun(struct student*head,int num)//查询
{
	struct student *a;
	a=head;
	while(a!=NULL)
	{
		if(num==a->num)
			printf("%s %d %d %s %d %d",a->name,a->num,a->age,a->sex,a->snum,a->cnum);
		break;
	}
}

struct student *del(struct student*head,int num)//删除
{
	struct student *a,*cut,*end;
	a=head;
	while(num!=a->num&&a->next!=NULL)
	{
		end=a;
		a=a->next;
	}
	if(a->num!=num)
		printf("无该学生信息");
	else
	{
		if(a==head)
			head=a->next;
		else
		{
			end->next=a->next;
		}
	}
	return(head);
}

struct student *charu(struct student *head,struct student *jing,int num)//插入
{
	struct student *a,*cut,*end,*xin;
	a=head;
	xin=jing;
	while(num!=a->num&&a->next!=NULL)
	{
		cut=a;
		a=a->next;
	}
	if(num!=a->num)
		printf("无法插入到指定位置");
	else
		if(a==head)
		{
			head->next=xin;
		}
		else if(a->next=NULL)
		{
			a->next=xin;
			xin->next=NULL;
		}
		else
		{
			end=a->next;
			a->next=xin;
			xin->next=end;
		}
		return(head);
}
 void save(struct student*head)  //保存数据到文件
 {
	 struct student *a;
	 a=head;
	 FILE*fp;
	 if((fp=fopen("D:\student.dat","wb"))==NULL)
	 {
		 printf("cannot open the file");
		 exit(0);
	 }
	 while(a!=NULL)
	 {
		 fprintf(fp,"%s %d %d %s %d %d",a->name,a->num,a->age,a->sex,a->snum,a->cnum);
		 a=a->next;
	 }
 }
int main()
{
	struct student *head,*shan,*jin,*jing;
	int m,n,k;
	head=creat();
	printf("输出所有信息：\n");
	print(head);
    printf("请输入查询学生的学号：\n");
	scanf("%d",&m);
	printf("该学生的信息为：\n");
	chaxun(head,m);
	printf("请输入要删除信息的学生的学号：\n");
	scanf("%d",&n);
	shan=del(head,n);
	printf("输出剩余学生信息：\n");
	print(shan);
	printf("请输入新增学生的信息：\n");
	jing=(struct student *)malloc(sizeof(struct student));
	jing->next=NULL;
	scanf("%s %d %d %s %d %d",jing->name,&jing->num,&jing->age,jing->sex,&jing->snum,&jing->cnum);
	printf("请输入A学生的学号（新增学生的信息在A学生之后）（新增学生的位置）：\n");
	scanf("%d",&k);
	jin=charu(head,jing,k);
	printf("输出新增学生后的所有学生的信息：\n");
	print(jin);
	system("pause");
	save(head);
	return 0;
}

[wanghao15536870732]

优点

• 每个功能都用函数独立了出来
• 实现了添加、删除功能

缺点

• 缺少必要的功能菜单提示
• 查找功能有问题

• 文件写入功能有问题

• 新增学生信息后，原来的信息丢失

• 缺少从文件读取学生信息