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