如：“hello world” 变为 “world hello”

// test.cpp : main project file.

#include "stdafx.h"
#include<iostream>
using namespace System;
using namespace std;
char * stringreverse(char str[],int start,int end)
{
  char tmp;
  while(start<end)
  {
     tmp = str[start];
     str[start] = str[end];
     str[end] = tmp;
     start++;
     end--;
  }
  return str;
}
int reversewords(char str[])
{
  int len = strlen(str);
  int start = 0;
  int end = 0;

  stringreverse(str,start,len-1);
  do
  {
     start = end;
  while(str[end] != ' '&&end<len)
       end++;
      end--;
      stringreverse(str,start,end);
     end+=2;
  }while(end<len);
  return 1;
}

int main(int argc, char* argv[])
{
 char str[100]="hello world" ;
    reversewords(str);
 printf("%s\n",str);
 return 0;
}