Copy bytes to buffer from buffer.
  Copies num bytes from src buffer to memory location pointed by dest.

Parameters.

dest

Destination buffer where data is copied.

src

Source buffer to copy from.

num

Number of bytes to copy.

Return Value.
  dest is returned.

Portability.
  Defined in ANSI-C.

Example.

/* memcpy example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str1[]="Sample string";
  char str2[40];
  char str3[40];
  memcpy (str2,str1,strlen(str1)+1);
  memcpy (str3,"copy successful",16);
  printf ("str1: %s\nstr2: %s\nstr3: %s\n",str1,str2,str3);
  return 0;
}

See also.
  memchr, memcmp, memset, strncpy