用C语言字典实现词典功能 C语言字典词典

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

#define MAXWORD 25
#define MAXMEAN 50

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 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;
/* 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 */
dictionary = (struct lnode *) malloc( sizeof(struct lnode));
if(dictionary != NULL) {
dictionary->next = NULL; //初始化
}

while(function != EXIT) {
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);
}

/* 添加 */
void Add(struct lnode *list)
{
int i;
struct record t;
struct lnode *n, *r;

/* 录入记录 */
printf( "Please input the word: ");
getchar();
gets(t.word);
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( 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);
}
} else {
printf( "Record Existed!\n");
DisplayTableHead();
DisplayRecord(r);
}
}

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

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

printf( "Please input the word you want to edit: ");
getchar();
gets(e);

if((r = SearchPrimarykey( list, 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;

printf( "Please input the word you want to search: ");
getchar();
gets(e);

if((r = SearchPrimarykey( list, e)) != NULL) {
DisplayTableHead();
DisplayRecord(r);
} else {
printf( "Cann't find the word.");
}
}

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

printf( "Please input the word you want to delete: ");
getchar();
gets(e);

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 = list->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)
{
struct lnode *p = list->next;

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 = list;
while(p->next != NULL) {
p = p->next;
free( list);
list = p;
}
free(p);
}

/* 显示表头 */
void DisplayTableHead(void) {
printf( "%-10s %s\n", "WORD", "MEANING");
}

/* 显示一条记录 */
void DisplayRecord(struct lnode *r)
{
printf( "%-10s %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):");
}