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void * memset ( void * ptr, int value, size_t num );

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.

#include <stdio.h> 
#include <string.h> 
int main () { 
 char str[] = "almost every programmer should know memset!"; 
 memset (str,'-',6); puts (str); 
 return 0; 
}

銀幕輸出

------ every programmer should know memset!

http://www.cplusplus.com/reference/clibrary/cstring/memset/