memset() — Set Bytes to Value

Format

#include <string.h>
void *memset(void *dest, int c, size_t count);

Language Level

ANSI

Threadsafe

Yes

Description

The memset() function sets the first count bytes of dest to the value c. The value of c is converted to an unsigned character.

Return Value

The memset() function returns a pointer to dest.

Example

This example sets 10 bytes of the buffer to A and the next 10 bytes to B. 
#include <string.h>
#include <stdio.h>
 
#define  BUF_SIZE  20
 
int main(void)
{
   char buffer[BUF_SIZE + 1];
   char *string;
 
   memset(buffer, 0, sizeof(buffer));
   string = (char *) memset(buffer,'A', 10);
   printf("\nBuffer contents: %s\n", string);
   memset(buffer+10, 'B', 10);
   printf("\nBuffer contents: %s\n", buffer);
}
 
/*******************  Output should be similar to:  ***************
 
Buffer contents: AAAAAAAAAA
 
Buffer contents: AAAAAAAAAABBBBBBBBBB
*/

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