程序代码：

#include <stdio.h>
#include <string.h>

const int MAX=256;

//应用指针统计一个字符串中有多少个单词
int main()
{
    char* nums[]={ "one" , "two"   , "tree"  , "four" , "five"\
                 , "six" , "seven" , "eight" , "nine" , "ten" };
    char word[MAX]={'\0'};
    char* test="This is a test number of words in the sentences.";
    char* p1=test;
    char* p2=test;
    int len=0;
    int index=0;
    while(1)
    {
        if (*(p2+1)!=0x20)
        {
            p2++;
            if (*p2!='\0') continue;
        }
        p2++;
        len=(int)(p2-p1);
        strncpy(word,p1,len);
        word[len]='\0';
        printf("the %5s word is : %s\n",nums[index],word);
        p2++;
        p1=p2;
        index++;
        if (*p2=='\0') break;
    }
    return 0;

}

/*
  样例输出：
    the   one word is : This
    the   two word is : is
    the  tree word is : a
    the  four word is : test
    the  five word is : number
    the   six word is : of
    the seven word is : words
    the eight word is : in
    the  nine word is : the
    the   ten word is : sentences.
*/