UVa 494 Kindergarten Counting Game(文字列処理)

494 - Kindergarten Counting Game
Time limit: 3.000 seconds
http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=94&page=show_problem&problem=435
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

2つの単語がアルファベット以外の文字で区切られている限り、2つの単語でも構いません.
完全なコード:

/*0.009s*/

#include<cstdio>
#include<cstring>
#include<cctype>

char str[300];

int main(void)
{
	int i, cnt;
	bool hasalpha;
	while (gets(str))
	{
		cnt = 0;
		hasalpha = false;
		for (i = 0; str[i]; i++)
		{
			if (isalpha(str[i]))
			{
				if (!hasalpha)
				{
					++cnt;
					hasalpha = true;
				}
			}
			else
			{
				if (hasalpha)
					hasalpha = false;
			}
		}
		printf("%d
", cnt);
	}
	return 0;
}