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c语言数据结构项目——基于Hash表的人员管理系统-创新互联
目录
功能目录
主函数
.h文件
功能实现
1.创建hash表
2.定义hash函数
3.添加功能
4.根据ID查找
5.显示所有人员
6.根据ID删除人员
7.根据ID修改人员信息
8.销毁hash表
9.从txt文件加载人员信息
10.将人员信息保存到txt文件中
功能演示
1.添加
2.显示
3.根据ID查找
4.根据ID删除
5.根据ID修改人员信息
功能目录
#include "../include/info.h"
int main()
{
int op = 0;
data_type item;
Hash *pHash = createHash();
load(pHash,"info.txt");
while (1)
{
menu();
int res=0;
scanf("%d", &op);
if (op == 0)
break;
switch (op)
{
case 1:
printf("请输入人员ID:\n");
scanf("%d", &item.id);
printf("请输入人员姓名:\n");
scanf("%s", item.name);
printf("请输入人员年龄:\n");
scanf("%d", &item.age);
printf("请输入人员职位:\n");
scanf("%s", item.status);
res=add(pHash, item);
if(res==OK)
{
printf("-----------------------------------------\n");
printf("添加成功！\n");
printf("-----------------------------------------\n");
}
break;
case 2:
show(pHash);
break;
case 3:
printf("请输入要查找人员的ID:\n");
scanf("%d",&item.id);
res=find(pHash,item);
if(res!=OK)
{
printf("-----------------------------------------\n");
printf("没有ID为%d的人员!\n",item.id);
printf("-----------------------------------------\n");
}
break;
case 4:
printf("请输入要删除人员的ID:\n");
scanf("%d",&item.id);
del(pHash,item);
break;
case 5:
printf("请输入要修改人员的ID:\n");
scanf("%d",&item.id);
res=change(pHash,item);
if(res==OK)
{
printf("-----------------------------------------\n");
printf("ID为%d的人员修改信息成功!\n",item.id);
printf("-----------------------------------------\n");
}
break;
case 6:
res=Destroy(&pHash);
if(res==OK)
{
printf("-----------------------------------------\n");
printf("销毁成功!\n");
printf("-----------------------------------------\n");
}
break;
case 7:
res=save(pHash,"info.txt");
if(res==OK)
{
printf("-----------------------------------------\n");
printf("保存成功!\n");
printf("-----------------------------------------\n");
}
break;
}
}
}#ifndef _INFO_H
#define _INFO_H
#include#include#include#include#include#include#include#define SIZE 30
typedef struct info
{
int id; // key
char name[SIZE];
int age;
char status[SIZE];
} data_type;
typedef struct node
{
data_type data;
struct node *next;
} Node;
typedef struct hash
{
Node *pArr[SIZE];
int count;
} Hash;
enum opt
{
OPENERROR = -7,
ERROR,
DOWNLOADERROR,
UPLOOADERROR,
EXIST,
NOEXIST,
MALLOCERROR,
OK
};
void menu();
Hash *createHash();
int HashFunc(int key);
int show(Hash *pHash);
int add(Hash *pHash, data_type pData);
int find(Hash *pHash, data_type pData);
int del(Hash *pHash, data_type pData);
int change(Hash *pHash,data_type pData);
int Destroy(Hash **pHash);
int namefind(Hash *pHash,data_type pData);
int save(Hash *pHash,char *filename);
int load(Hash *pHash,char *filename);
#endif //创建一个hash表
Hash *createHash()
{
Hash *pHash = NULL;
pHash = (Hash *)malloc(sizeof(Hash));
if (NULL == pHash)
{
perror("malloc error");
return NULL;
}
memset(pHash, 0, sizeof(Hash));
return pHash;
}//hash函数
int HashFunc(int key)
{
int pos;
pos=key%13;
return pos;
}//添加
int add(Hash *pHash, data_type pData)
{
if (pHash == NULL)
{
perror("malloc error");
return NOEXIST;
}
int res=0;
res=find(pHash,pData);
//当前数据元素是否已经存在
if ( res==OK )
{
printf("-----------------------------------------\n");
printf("该ID对应人员已存在!\n");
printf("-----------------------------------------\n");
return EXIST;
}
//创建一个新结点
Node *pNew = NULL;
pNew = (Node *)malloc(sizeof(Node));
if (NULL == pNew)
{
perror("malloc error");
return MALLOCERROR;
}
//memset(pNew, 0, sizeof(Node));
pNew->data = pData;
int pos = HashFunc(pData.id);
//保护好后面的结点
pNew->next = pHash->pArr[pos];
pHash->pArr[pos] = pNew;
return OK;
}int find(Hash *pHash, data_type pData)
{
if (NULL == pHash)
{
perror("malloc error");
return NOEXIST;
}
int pos = HashFunc(pData.id);
Node *pTmp = NULL;
pTmp = pHash->pArr[pos];
if (NULL == pTmp)
{
return NOEXIST;
}
while (pTmp != NULL)
{
if (pData.id == pTmp->data.id)
{
printf("ID为%d的人员信息如下:\n", pData.id);
printf("-----------------------------------------\n");
printf("ID:%d ", pTmp->data.id);
printf("姓名:%s ", pTmp->data.name);
printf("年龄:%d ", pTmp->data.age);
printf("职位:%s\n", pTmp->data.status);
printf("-----------------------------------------\n");
return OK;
}
}
}int show(Hash *pHash)
{
if (NULL == pHash)
{
perror("malloc error");
return MALLOCERROR;
}
//遍历输出
int i = 0;
Node *pTmp = NULL;
for (i = 0; i< SIZE; i++)
{
//结构体指针指向链表首地址
pTmp = pHash->pArr[i];
while (pTmp != NULL)
{
printf("-----------------------------------------\n");
printf("ID:%d ", pTmp->data.id);
printf("姓名:%s ", pTmp->data.name);
printf("年龄:%d ", pTmp->data.age);
printf("职位:%s\n", pTmp->data.status);
printf("-----------------------------------------\n");
pTmp = pTmp->next;
}
}
return OK;
}int del(Hash *pHash, data_type pData)
{
if (NULL == pHash)
{
perror("malloc error");
return MALLOCERROR;
}
int res = 0;
res = find(pHash, pData);
if (res != OK)
{
printf("-----------------------------------------\n");
printf("没有该ID为%d的人员!\n", pData.id);
printf("-----------------------------------------\n");
return ERROR;
}
if (pData.id< 0)
{
return ERROR;
}
int pos = HashFunc(pData.id);
Node *pTmp = NULL;
pTmp = pHash->pArr[pos];
Node *pPre = pTmp;
Node *pDel = pTmp->next;
if (pData.id = pPre->data.id)
{
pDel = pPre;
pHash->pArr[pos] = pPre->next;
printf("-----------------------------------------\n");
printf("删除成功!\n");
printf("-----------------------------------------\n");
free(pDel);
pHash->count--;
return OK;
}
else
{
while (NULL != pDel)
if (pData.id == pDel->data.id)
{
pPre->next = pDel->next;
printf("-----------------------------------------\n");
printf("删除成功!删除人员信息如下:\n");
printf("ID:%d ", pTmp->data.id);
printf("姓名:%s ", pTmp->data.name);
printf("年龄:%d ", pTmp->data.age);
printf("职位:%s\n", pTmp->data.status);
printf("-----------------------------------------\n");
free(pDel);
return OK;
}
else
{
pPre = pDel;
pDel = pDel->next;
}
}
if (NULL == pDel)
{
printf("-----------------------------------------\n");
printf("此ID对应人员信息不存在\n");
printf("-----------------------------------------\n");
}
return OK;
}int change(Hash *pHash, data_type pData)
{
if (NULL == pHash)
{
perror("malloc error");
return MALLOCERROR;
}
if (pData.id< 0)
{
return ERROR;
}
int res = 0;
res = find(pHash, pData);
if (res != OK)
{
printf("-----------------------------------------\n");
printf("没有该ID为%d的人员!\n", pData.id);
printf("-----------------------------------------\n");
return ERROR;
}
int pos = HashFunc(pData.id);
Node *pTmp = NULL;
pTmp = pHash->pArr[pos];
while (pTmp->data.id != pData.id)
{
pTmp = pTmp->next;
}
printf("请输入ID为%d的人员修改后的名字:\n", pData.id);
scanf("%s", pTmp->data.name);
printf("请输入ID为%d的人员修改后的年龄:\n", pData.id);
scanf("%d", &pTmp->data.age);
printf("请输入ID为%d的人员修改后的职位:\n", pData.id);
scanf("%s", pTmp->data.status);
return OK;
}int Destroy(Hash **pHash)
{
if (NULL == pHash)
{
return ERROR;
printf("-----------------------------------------\n");
printf("销毁成功!\n");
printf("-----------------------------------------\n");
}
int i;
Node *pDel = NULL;
Node *pTmp = NULL;
for (i = 0; i< SIZE; i++)
{
pTmp = (*pHash)->pArr[i];
while (pTmp != NULL)
{
//头删法
pDel = pTmp;
pTmp = pTmp->next;
free(pDel);
pDel = NULL;
}
}
free(*pHash);
*pHash = NULL;
return OK;
}int load(Hash *pHash, char *filename)
{
data_type infodata;
if (pHash == NULL)
{
perror("malloc error");
return ERROR;
}
int fp = open(filename, O_RDONLY);
if (fp< 0)
{
perror("open error");
return ERROR;
}
while (1)
{
int res = read(fp, &infodata, sizeof(data_type));
if (0 == res)
{
printf("信息已导入!\n");
break;
}
else if (res< 0)
{
printf("导入失败!\n");
return ERROR;
}
else
{
add(pHash, infodata);
pHash->count++;
}
}
close(fp);
return OK;
}int save(Hash *pHash, char *filename)
{
int fw = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0777);
if (fw< 0)
{
perror("open error");
return ERROR;
}
int i;
for (i = 0; i< SIZE; i++)
{
Node *pTmp = pHash->pArr[i];
while (pTmp != NULL)
{
// memset(&pTmp->data,0,sizeof(data_type));
//写入
int res = write(fw, &pTmp->data, sizeof(data_type));
if (res< 0)
{
printf("save error");
}
else if (0 == res)
{
printf("save error");
break;
}
pTmp = pTmp->next;
}
}
close(fw);
return OK;
}
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