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


#define MAXWORD 50
#define DICTSIZ 100


char dict[DICTSIZ][MAXWORD+1];


//字典中字母數
int nwords = 0;
int nextin(char* cmd, char* word);
int initw();
int insertw(const char* word);
int deletew(const char* word);
int lookupw(const char* word);


int main(int argc, char* argv[])
{
char word[MAXWORD+1];
char cmd;
int wrdlen;
while(1)
{
wrdlen = nextin(&cmd, word);
if (wrdlen<0)
{
exit(0);
}
switch(cmd)
{
case 'I':
initw();
printf("Dictionary initalized to empty\n");
break;


case 'i':
insertw(word);
printf("%s inserted\n", word);
break;


case 'd':
if (deletew(word))
{
printf("%s deleted \n", word);
}
else
{
printf("%s not found \n", word);
}
break;


case 'l':
if (lookupw(word))
{
printf("%s was found\n", word);
}
else
{
printf("%s was not found\n", word);
}
break;
case 'q':
printf("program quits\n");
exit(0);
default:
printf("command %c invalid\n", cmd);
break;
}
}
return 0;
}


int nextin(char* cmd, char* word)
{
int i, ch;
ch=getc(stdin);
while(isspace(ch))
{
ch=getc(stdin);
}
if(ch==EOF)
{
return -1;
}
*cmd=(char)ch;
ch=getc(stdin);
while(isspace(ch))
{
ch=getc(stdin);
}
if(ch==EOF)
{
return -1;
}
if ('\n'==ch)
return 0;


i=0;
while(!isspace(ch))
{
if (MAXWORD < ++i)
{
printf("error: word too long\n");
exit(1);
}
*word++ =ch;
ch=getc(stdin);
}
*word++=0;
return i;
}


int initw()
{
nwords=0;return 1;
}


int insertw(const char* word)
{
strcpy(dict[nwords], word);
nwords++;
return nwords;
}


int deletew(const char* word)
{
int i;
for(i=0;i<nwords;i++)
{
if (0==strcmp(word, dict[i]))
{
nwords--;
strcpy(dict[i], dict[nwords]);
return 1;
}
}
return 0;
}


int lookupw(const char* word)
{
int I;
for(I=0;nwords>I;I++)
{
if (0==strcmp(word, dict[I]))
{
return 1;
}
}
return 0;
}

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