英文语句按单词反序输出

#include "stdafx.h"
#include "string.h"
#include "stdlib.h"

#define MAX_STR_LEN  256
/*ZG:将输入的英文语句，反向输出
*eg:
*Input :"I am a student"
*Output:"student a am I"
*/
int revert_en_sentence(char *pIn,char *pOut)
{
    int i = 0, len = 0;
    if(NULL==pIn || NULL==pOut)
    {
        return -1;
    }
    char *pI = pIn;
    char *pO = pOut;
    char *pT = pIn;

    printf("%s\n",pI);
    /*先将pT移至最后一字符*/
    while('\0'!=*pT)
    {
        pT++;
    }
    pT--;//回退一个char，指向倒数第一个非'\0'字符

    while(pT!=pI)
    {
     if(' '!=*pT)
        {
            pT--; //有循环找出口
            len++;
            continue;
        }
        else
        {
         for(i=0;i<len;i++)
         {
         *pO = pT[i+1];
                pO++;
         }
         *pO = ' ';
           pO++;
         len = 0;
           pT--;
        }

    }

    for(i=0;i<=len;i++)
    {
     *pO = pT[i];
       pO++;
    }

    pO++;
   *pO = '\0';

   pOut = pO;

}

int _tmain(int argc, _TCHAR* argv[])
{
    char array [MAX_STR_LEN] = "I am a student";
    //char array [MAX_STR_LEN] = "student";
    char strout[MAX_STR_LEN] = "";

    revert_en_sentence(array,strout);

    printf("%s\n",strout);

    system("pause");
    return 0;
}