学习了接受换行的方法，scanf()遇到换行和空格就停止了，另外学习了一点儿编程技巧，写宏命令能让程序更短

#include "stdio.h"#include "string.h"#define FUN(a) ((a >= 97 && a <= 122) || (a >= 65 && a <= 90 ))main(){	char a ,b = ' ',sum = 0;	while((a = getchar()) != EOF)	{		if('\n' == a) 		{			printf("%d\n",sum);			b = ' ';			sum = 0;		}		else		{			if( FUN(a) && (!FUN(b)) )  sum++;			b = a;		}	}	return 0;}