memcpy memmove memset

//memcpy
int main01()
{
const char str[50] = "www.google.com";
char dest[50];

//遇到不熟悉的函数，按F1看微软的帮助文档，

//memcpy(dest, str, strlen(str)+1);
//memcpy(dest, str + 11, 6);
memcpy(dest, str + 11*sizeof(char),6*sizeof(char));
dest[6] = '\0';
printf("dest = %s", dest);
return 0;
}
//memmove
int main02() {
const char dest[] = "oldString";//destibnation
const char src[] = "newString";//source

printf("dest = %s\nsrc = %s\n\n", dest, src);
memmove(dest, src, strlen(src) + 1);
printf("dest = %s\nsrc = %s\n\n", dest, src);
//dest = newString
//src = newString

return 0;

}
//memset
int main()
{
char str[50];
strcpy(str, "Hello Allen\n");
puts(str);

//set函数 get函数
memset(str,65,3);//65
puts(str);

return 0;
}