英文單詞個數的統計

//2018 /4/21
#include<stdio.h>
#include<string.h>
#include<ctype.h>

#define init_word 0
#define in_word 1
#define out_word 2
#define end_word 3

int count_word(char *ch);

int main()
{
	char ch[100] = {"small big pig jkd"};
	int num = count_word(ch);
	printf("-------------num = %d-----------------\n",num);
	return 0;
}

int count_word(char *ch)
{
	int num = 0;
	int tag = init_word;
	
	for (int i = 0;ch[i] !='\0';++i)
	{
		switch(tag)
		{
		case init_word:
			if(isalpha(ch[i]))
			{
				tag = in_word;
			}
			else
			{
				tag = out_word;
			}
			break;
		case in_word:
			if(!isalpha(ch[i]))
			{
				tag = out_word;
				num = num + 1;
			}
			break;
		case out_word:
			if(isalpha(ch[i]))
			{
				tag = in_word;
			}
			break;
		case end_word:break;
		}
	}
	if(tag == in_word)
		{
			num = num +1;//爲什麼要加這一句（因爲不加這一句會少統計一個單詞，原因出在for循環（ch[i]上），最後一個單詞直接跳出循                                      //環沒有統計上）
		}
	return num;
}