C String Functions - C memset

void *memset(void *str , int c , size_t n );

Copies the character c (an unsigned char) to the first n characters of the string str.

The argument str is returned.

Prototype

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

Parameter

This function has the following parameter.

ptr: Pointer to the block of memory to fill.
value: Value to be set.
num: Number of bytes to be set to the value.

size_t is an unsigned integral type.

Return

ptr is returned.

Example


#include <stdio.h>
#include <string.h>

int main (){
  char str[] = "this is a test!";
  memset (str,'-',6);
  puts (str);
  return 0;
}

The code above generates the following result.

Example 2


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 //ww w .  j  av a2s .c om
int main(void)
{
    char str[] = "this is a test";
    puts(str);
    memset(str,'a',5);
    puts(str);
}

The code above generates the following result.