/* Demonstrating memset(), memcpy(), and memmove(). */

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

char message1[60] = "Four score and seven years ago ...";
char message2[60] = "abcdefghijklmnopqrstuvwxyz";
char temp[60];

main()
{
printf("\nmessage1[] before memset():\t%s", message1);
memset(message1 + 5, '@', 10);
printf("\nmessage1[] after memset():\t%s", message1);

strcpy(temp, message2);
printf("\n\nOriginal message: %s", temp);
memcpy(temp + 4, temp + 16, 10);
printf("\nAfter memcpy() without overlap:\t%s", temp);
strcpy(temp, message2);
memcpy(temp + 6, temp + 4, 10); 
printf("\nAfter memcpy() with overlap:\t%s", temp);

strcpy(temp, message2);
printf("\n\nOriginal message: %s", temp);
memmove(temp + 4, temp + 16, 10);
printf("\nAfter memmove() without overlap:\t%s", temp);
strcpy(temp, message2);
memmove(temp + 6, temp + 4, 10); 
printf("\nAfter memmove() with overlap:\t%s", temp);
return(0);     
}