memset has nothing to do with setting memory to the heap, as Uhrwerk said it is setting the memory address to the character you specify (usually 0 to clear the previous data)
Example:
Code:
// 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 );
}
Output:
Code:
Before: This is a test of the memset function
After: **** is a test of the memset function
