memset, wmemset
Collapse the table of content
Expand the table of content
The document is archived and information here might be outdated

memset, wmemset

Sets buffers to a specified character.

void *memset(
   void *dest,
   int c,
   size_t count 
wchar_t *wmemset(
   wchar_t *dest,
   wchar_t c,
   size_t count


Pointer to destination.
Character to set.
Number of characters.

Return Value

The value of dest.


Sets the first count chars of dest to the character c.

Security Note   Make sure that the destination buffer is the same size or larger than the source buffer. For more information, see Avoiding Buffer Overruns.


Routine Required header Compatibility
memset <memory.h> or <string.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
wmemset <wchar.t> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.


All versions of the C run-time libraries.


// crt_memset.c
/* This program uses memset to
 * set the first four chars of buffer to "*".

#include <memory.h>
#include <stdio.h>

int main( void )
   char buffer[] = "This is a test of the memset function";

   printf( "Before: %s\n", buffer );
   memset( buffer, '*', 4 );
   printf( "After:  %s\n", buffer );


Before: This is a test of the memset function
After:  **** is a test of the memset function

See Also

Buffer Manipulation Routines | _memccpy | memchr | memcmp | memcpy | _strnset | Run-Time Routines and .NET Framework Equivalents

© 2016 Microsoft