-> 和 . 的差別

struct User
{
 char name[40]; //can't do dynamic memory allocation in definition
 int age; //int age =18; //can't initialize member in definition
 int tel;
};

User userObject;
strcpys(userObject.name, "Micheal");
userObject.age = 20;
userObject.tel = 1234567;

User* userPtr = &userObject;
strcpy_s(userPtr->name, "Micheal");
userPtr->age = 20;
userPtr->tel = 1234567;