Fill block of memory Sets the first num bytes of the block of memory pointed by ptr to the specified value (interpreted as an unsigned char)

Parameters ptr

Pointer to the block of memory to fill. value Value to be set. The value is passed as an int, but the function fills the block of memory using the unsigned char conversion of this value.
num Number of bytes to be set to the value.

/* memset example */

include <stdio.h>

include <string.h>

int main () { char str[] = "you damn!"; memset (str,'-',6); puts (str); return 0; } Output:

------ you damn!