Code:
_strrev, _wcsrev, _mbsrev
Reverse characters of a string.

char *_strrev( char *string );

wchar_t *_wcsrev( wchar_t *string );

unsigned char *_mbsrev( unsigned char *string );

Routine Required Header Compatibility 
_strrev <string.h> Win 95, Win NT 
_wcsrev <string.h> or <wchar.h> Win 95, Win NT 
_mbsrev <mbstring.h> Win 95, Win NT 


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version 
LIBCMT.LIB Multithread static library, retail version 
MSVCRT.LIB Import library for MSVCRT.DLL, retail version 


Return Value

Each of these functions returns a pointer to the altered string. No return value is reserved to indicate an error.

Parameter

string

Null-terminated string to reverse

Remarks

The _strrev function reverses the order of the characters in string. The terminating null character remains in place. _wcsrev and _mbsrev are wide-character and multibyte-character versions of _strrev. The arguments and return value of _wcsrev are wide-character strings; those of _mbsrev are multibyte-character strings. For _mbsrev, the order of bytes in each multibyte character in string is not changed. These three functions behave identically otherwise. 

Generic-Text Routine Mappings

TCHAR.H Routine  _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined 
_tcsrev _strrev  _mbsrev  _wcsrev  


Example

/* STRREV.C: This program checks an input string to
 * see whether it is a palindrome: that is, whether
 * it reads the same forward and backward.
 */

#include <string.h>
#include <stdio.h>

void main( void )
{
   char string[100];
   int result;

   printf( "Input a string and I will tell you if it is a palindrome:\n" );
   gets( string );

   /* Reverse string and compare (ignore case): */
   result = _stricmp( string, _strrev( _strdup( string ) ) );
   if( result == 0 )
      printf( "The string \"%s\" is a palindrome\n\n", string );
   else
      printf( "The string \"%s\" is not a palindrome\n\n", string );
}


Output

Input a string and I will tell you if it is a palindrome:
Able was I ere I saw Elba
The string "Able was I ere I saw Elba" is a palindrome