算法竞赛入门经典-前四章-UVa494 - Kindergarten Counting Game-幼儿园数数游戏-难度1

题目链接：

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=435

                                
                                 Kindergarten Counting Game

Everybody sit down in a circle. Ok. Listen to me carefully.

``Woooooo, you scwewy wabbit!''

Now, could someone tell me how many words I just said?

Input and Output

Input to your program will consist of a series of lines, each line containing multiple words (at least one). A ``word'' is defined as a consecutive sequence of letters (upper and/or lower case).

Your program should output a word count for each line of input. Each word count should be printed on a separate line.

Sample Input

Meep Meep!
I tot I taw a putty tat.
I did! I did! I did taw a putty tat.
Shsssssssssh ... I am hunting wabbits. Heh Heh Heh Heh ...

Sample Output

2
7
10
9

代码：

#include 
#include 
#include 
using namespace std;

int main()
{
#ifdef LOCAL
	freopen("f:\\input.txt", "r", stdin);
#endif LOCAL
    char buf[10000];
	while(fgets(buf, sizeof(buf), stdin))
	{
		int count = 0, flag = 1;
		for(int i = 0; buf[i] != 0 ; ++i)
		{
			if(flag && isalpha(buf[i]))
			{//当flag为1并且buf[i]是字母时，count+1
				count ++;
				flag = 0;//当碰到一次字母后把flag置为0
			}
			if(!isalpha(buf[i]))
			{
				flag = 1;//当碰到一次非字母后把falg置为1
			}
		}
		cout << count << endl;
	}
	return 0;
}