关于字符串倒转

iteye_13984

于 2011-10-10 20:25:48 发布

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分类专栏： C，C++

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有纯倒转，也有按单词为单位的。想做个总结


#include<stdio.h>

void ReverseChar(  char * const  start,  char * const end)
{
    if( start == NULL || end== NULL || start == end )
        return ;
    char * _start = start;
    char * _end    = end;
    while( _start <  _end )
    {
    //  *_start ^= *_end ^= *_start ^= *_end;
    *_start ^= *_end;
    *_end ^= *_start;
    *_start ^= *_end;
        _start++;
        _end--  ;
    }
}

void ReverseString( char  *str )
{
    if ( NULL == str )
        return ;
//reverse word
 char *pend   =  str ;
  char *pstart =  str ;
  while( *pend != '\0' )
  {
   while( *pstart == ' ' )
   pstart++;
   pend = pstart;
   while( *pend != ' ' && *pend != '\0')
   pend++;
   ReverseChar( pstart,pend-1 );
   pstart = pend ;
  }
  ReverseChar( str,pend-1 );
}

int main()
{
    char str[] = "I am a   student!!!";
    printf( "%s\n", str );
    ReverseString( str );
    printf( "%s\n" , str);

    return 0;
}