编写一个程序，把输入作为字符流读取，直至遇到EOF。令其报告

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#include <stdio.h>
#include <ctype.h>
int main(void)
{
 int num=0;
 char ch;
 bool word=0;
 while ( (ch=getchar()) != EOF )
 {
 if ( isalpha(ch) && !word )
 {
 word = 1;
 num++;
 }
 if ( !isalpha(ch) )
 {
 word = 0;
 }
 }
 printf("words: %d\n",num);
 return 0;
}