数据结构课程设计——英汉词典

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAXWORD 25
#define MAXMEAN 50
#define FILEN 100  //读取文件时一行数据的长度
struct record   //记录结构_读者
{
char word[MAXWORD+1];   //key
char mean[MAXMEAN+1];
};

struct lnode    //链表结点结构
{
struct record data;
struct lnode *next;
};

/* 函数声明 */
void Add(struct lnode *list[]);
void FileAdd(struct lnode *list,char *filename);
void Search(struct lnode *list[]);
void Edit(struct lnode *list[]);
void Delete(struct lnode *list[]);
void Display(struct lnode *list[]);
struct lnode *SearchPrimarykey(struct lnode *list, char *key);//*****************************
void InsertList(struct lnode *list, struct lnode *n);
void FreeList(struct lnode *list[]);
void DisplayTableHead(void);
void DisplayRecord(struct lnode *r);
void DisplayMenu(void);

/* 主程序 */
int main(int argc, char *argv[])
{
struct lnode *dictionary[26];
struct lnode *p;

char filename[20];//文件名字(用来读取a.txt    b.txt...里面的单词文件， *.txt  名字是需要改变的)
char charr[2];//存放a-z字符

/* 功能选择，依次为：退出、添加、查找、删除、显示所有记录 */
enum {EXIT, ADD, SEARCH, EDIT, DEL, DISP} function = DISP;

/* 头结点 */
for(int i=0; i<26; i++)
{
dictionary[i] = (struct lnode *)malloc(sizeof(struct lnode));
if(dictionary[i] != NULL)
{
dictionary[i]->next = NULL; //初始化
}
}

for(int i=0; i<26; i++)
{
char charr[2];
charr[0]=(char)(i+97);
charr[1]='\0';
strcpy(filename,"./dir/");
strcat(filename,charr);
strcat(filename,".txt\0");
//printf("%s\n",filename);
p=*(dictionary+i);
FileAdd(p,filename);
}

while(function != EXIT)
{
p=*dictionary;
DisplayMenu();
scanf("%d",&function);
while(function < EXIT || function > DISP)
{
scanf("%d",&function);
}

switch(function)
{
case ADD:
Add(dictionary);
break;
case SEARCH:
Search(dictionary);
break;
case EDIT:
Edit(dictionary);
break;
case DEL:
Delete(dictionary);
break;
case DISP:
Display(dictionary);
break;
case EXIT:
exit(0);
break;
default:
printf("Input Error! Please input the right word.");
break;
}
}
FreeList(dictionary);
}

//从文件中添加单词
void FileAdd(struct lnode *list,char *filename)
{
struct record t;
struct lnode *n, *r;
//char filename[20];
FILE *fp;
char str[FILEN+1];
char word[30];
char mean[50];
int h = 0;

if( (fp=fopen(filename,"rt")) == NULL )
{
printf("Cannot open file, press any key to exit!\n");
getchar();
exit(1);
}
while(fgets(str, FILEN, fp) != NULL)
{
//printf("%s", str);
h++;
int i = 0;
int j = 0;
for(i; str[i]!=' '; i++)
{
word[i] = str[i];
}
word[i]='\0';
for(++i,j; str[i]!='\n'; i++,j++)
{
mean[j] = str[i];
}
mean[j] = '\0';

//cout<<"单词"<<word<<"有以下几种意思"<<mean<<endl;
strcpy(t.word,word);
strcpy(t.mean,mean);
/* 判断记录是否已存在，若存在则显示记录，若不存在则添加记录 */
if((r = SearchPrimarykey(list, t.word)) == NULL)
{
// 申请lnode空间并初始化
n = (struct lnode *)malloc(sizeof(struct lnode));
if(n != NULL)
{
//* 复制记录
strcpy((n->data).word,t.word);
strcpy((n->data).mean, t.mean);
//* 插入链表
InsertList(list, n);
}
}
}
//printf("%d\n",h);
fclose(fp);
}

/* 添加 */
void Add(struct lnode *list[])
{
int i;
struct record t;
struct lnode *n, *r;
struct lnode *onelist;
/* 录入记录 */
printf("Please input the word: ");
getchar();
gets(t.word);
onelist=*(list+t.word[0]-97);//通过单词首字母找到单词所属于的链表， a是97
fflush(stdin);
printf("Please input the meaning:");
gets( t.mean);

/* 判断记录是否已存在，若存在则显示记录，若不存在则添加记录 */
if((r = SearchPrimarykey(onelist, t.word)) == NULL)
{
/* 申请lnode空间并初始化 */
n = (struct lnode *)malloc(sizeof(struct lnode));
if(n != NULL)
{
/* 复制记录 */
strcpy((n->data).word,t.word);
strcpy((n->data).mean, t.mean);
/* 插入链表 */
InsertList(onelist, n);
}
}
else
{
printf("Record Existed!\n");
DisplayTableHead();
DisplayRecord(r);
}
}

/* 修改 */
void Edit(struct lnode *list[])
{

struct record t;
struct lnode *r, *p;
struct lnode *onelist;
char e[MAXWORD];

printf("Please input the word you want to edit: ");
fflush(stdin);
//getchar();
gets(e);
onelist = *(list+(e[0]-97));
p = onelist;

if((r = SearchPrimarykey(onelist, e)) != NULL)
{
fflush(stdin);
printf("Please edit the word: ");
gets(t.word);
printf("Please edit the meaning:");
gets(t.mean);

/* 复制记录 */
strcpy((r->data).word,t.word);
strcpy((r->data).mean,t.mean);

}
else
{
printf("Record cann't find!\n");
}
}
/* 查找 */
void Search(struct lnode *list[])
{
char e[MAXWORD];
struct lnode *r;
struct lnode *onelist;
printf("Please input the word you want to search: ");
getchar();
gets(e);
onelist = *(list+(e[0]-97));
if((r = SearchPrimarykey(onelist, e)) != NULL) //SearchPrimarykey 会返回一个p指针或者null   ，返回p 说明查找成功，返回null 说明查找失败，单词不存在
{
DisplayTableHead();
DisplayRecord(r);
}
else
{
printf("Cann't find the word.");
}
}

/* 删除 */
void Delete(struct lnode *list[])
{
char e[MAXWORD];
struct lnode *q, *p;
struct lnode *onelist;

printf("Please input the word you want to delete: ");
getchar();
gets(e);
onelist = *(list+e[0]-97);
q = onelist;
p = onelist->next;
while(p != NULL)
{
if(strcmp((p->data).word, e) == 0)
{
q->next = p->next;
free(p);    /* 释放空间 */
return ;    /* 函数返回 */
}
q = p;
p = p->next;
}
}

/* 显示所有记录 */
void Display(struct lnode *list[])
{
int c = 0;
struct lnode *p;
char charr[2];//存放a-z字符

printf("\n--------请输入a--z中任意一个字符---------\n");
getchar();
gets(charr);
p = *(list+charr[0]-97);
p=p->next;
printf("\n--------- ReaderMessage Display ---------\n");
DisplayTableHead();
while(p != NULL)
{
DisplayRecord(p);
c++;    /* 记录条数 */
p = p->next;
}
printf("\n--------- Total:  %d  Record(s) ---------\n",c);
}

/* 按主键查找 */
struct lnode *SearchPrimarykey(struct lnode *list, char *key)//传进来的list是当前单词首字母那个链表，不是全部的
{
struct lnode *p = list->next;   //p指向一个节点，通过比较看一下这个节点是不是要查的单词，如果是，把p指向的节点返回。

while (p != NULL)
{
if(strcmp((p->data).word, key) == 0)
{
return p;
}
p = p->next;
}
return NULL;
}

/* 将记录按姓名字母升序插入链表 */
void InsertList(struct lnode *list, struct lnode *n)
{
struct lnode *p = list;

while (p->next != NULL && strcmp((p->next->data).word, (n->data).word) < 0)
{
p = p->next;
}
n->next = p->next;
p->next = n;
}

/* 释放整个链表空间 */
void FreeList(struct lnode *list[])
{
struct lnode *p,*onelist;
for(int i=0; i<26; i++)
{
onelist= *(list+i);
p=onelist;
while(p->next != NULL)
{
p = p->next;
free(onelist);
onelist = p;
}
free(p);
}

}

/* 显示表头 */
void DisplayTableHead(void)
{
printf("%-14s %s\n","WORD","MEANING");
}

/* 显示一条记录 */
void DisplayRecord(struct lnode *r)
{
printf("%-12s %s\n", (r->data).word, (r->data).mean);
}

/* 显示菜单 */
void DisplayMenu(void)
{
printf("\n--------- ReaderMessage Menu ---------\n");
printf("\n\t1.Add\n\t2.Search\n\t3.Edit\n\t4.Del\n\t5.Display\n\t0.Exit\n");
printf("\nPlease select the function number(0-5):");
}