翻转句子中单词

/*昨天看到说是面试题，看了看是字符翻转问题*/

 

#include

 

/*整句翻转*/

char *strrev( char *src)
{
 char *begin, *end, temp = '\0';

 begin = end = src;

 if( src == NULL)
  return NULL;

 while( *end != 0)
 {
  end++;
 }
 end -= 1;

 for( ; begin < end; begin++, end--)
 {
  temp = *begin;
  *begin = *end;
  *end = temp;
 }

 return src;
}

/*局部翻转*/

char *revpart( char *src)
{
 char *begin, *end, *dumyend, temp = '\0';

 begin = end = dumyend = src;

 if( src == NULL)
  return NULL;

 while( *dumyend != '\0')
 {
  while( *end != '\0' && *end != ' ')
  {
   end++;
  }
  dumyend = end;
  end -= 1;

  for( ; begin < end; begin++, end--)
  {
   temp = *end;
   *end = *begin;
   *begin = temp;
  }

  while( *dumyend == ' ')
   dumyend++;
   
  begin = end = dumyend;
 }

 return src;
}

/*main*/
int main(void)
{
 char a[] = "I  am a student";
 char *ret;

 strrev(a);
 printf("%s\n", a);

 revpart(a);
 printf("%s\n", a);

 return 0;
}

/*

*总结:字符串翻转，双次翻转位置不变，单次翻转，相对位置对称翻转。

*/