uva 10815 Andy's First Dictionary

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

char word[1000001][201];
int cmp_string(void * a,void *b)
{
	char * ax=(char *)a;
	char * bx=(char *)b;
	return strcmp(ax,bx);
}
int main()
{
	char c;int i=0,j=0;
	while(1)
	{
		c=getchar();
		if(c==EOF) break;
		
		if(isalpha(c))
		{
			word[i][j++]=tolower(c);
		}
		else if(isalpha(word[i][0]))//在只有word[i][0]是字母时，添加\0。保证word里存储的都是单词。而不是单独的\0. 
		{
			word[i][j]='\0';
			i++;j=0;
		}
	}
	int k;
	qsort(word,i,sizeof(word[0]),cmp_string);
	for(k=0;k<i;k++)
	{
		if(strcmp(word[k],word[k+1])!=0)
		printf("%s\n",word[k]);
	}
	return 0;
}