mem.c

里面包含很多c语言的源码

/* 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];

int main( void )
{
   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\n", temp);
   return 0;
}