单词翻转

参考网上的代码，谁知道有问题，修改了下，貌似可以了，VS2008上试验毫无鸭梨。

#include <iostream>
using namespace std;
//计算长度
size_t str_len(char *str_source)
{
   size_t i = 0;
   while (*str_source++ != '\0')
   {
	   ++i;
   }
   return i;
}
//翻转指定位置的字符串
char *reverse_str(char *str_source,size_t str_begin,size_t str_end)
{
	size_t len = str_len(str_source);
	if(str_begin < 0 || str_end > len || str_end-str_begin > len)
	{
		throw runtime_error("error");
	}
	char* str1 =new char[len+1];
	strcpy(str1,str_source);
    for (; str_begin < str_end; ++str_begin,--str_end)
    {
		char temp = str_source[str_begin];
		str1[str_begin] = str_source[str_end-1];
		str1[str_end-1] = temp;
    }
	return str1;
}
//单词翻转
char *ReversalChar(char   *strSouce)  
{
   size_t len = str_len(strSouce);
   //char* str1 = reverse_str(strSouce,0,len);
   size_t start = 0;
   char* str1 =new char[len+1];
   str1 = reverse_str(strSouce,0,len);
   for (size_t i = 0; i < len; ++i)
   {
	  if (strSouce[i] == ' ')
	  {
		  if (start == 0)
		  {
			  str1= reverse_str(str1,0,i);
			  start = i+1;
		  }
		  else
		  {
			  str1 = reverse_str(str1,start,i);
		  }
	  }
	     
   }
   return str1;
}
int main()
{
	char* str_sourec = "sd qw zx lk";
	cout << ReversalChar(str_sourec);
}