need help on this inheritance problem about phones..

[MyRedz]

hi all.
i am just starting doing this idea of inheritance handphones of oop c++..
but this uml diagram below got some weird symbols like
inbox:string[N*]
mms_inbox:image[N]
what is it?
it sure is not c++..
any guide help to my questions..
below the uml is my handwritten coding from uml to brief c++...
is my coding ok?
can it be compilable?
even i have my doubts looking at how weird the uml is...

Handphone
-phoneNumber:string
-message: string
-credit:double
-sms_rate:double
-inbox:string[N*]
-object_counter:int
+<<constructor>> Handphone(no:string, cr:double, rate:double)
+smsEdit():void
+smsRead():void
+operator>>(recipient:Handphone&):void
+getCredit():double
+getObjCounter():int
+operator+(topUp:double): Handphone



Smartphone
-mms_message:image
-mms_inbox:image[N]
+operator>>(:Smartphone):void
+mmsRead():void
+mmsEdit():void
Fig. 2 Detail UML diagrams

here's my work...any comments ideas or something..i think it's ok..

class Handphone
{
private:
 
string phoneNumber;
string message;
 
double credit;
 
string[N*] inbox;
 
int object counter;
 
 
 
public:
 
Handphone ( string no, double cr,double rate)
 
void smsEdit();
 
void smsRead();
 
 
}
 
 
Class Smartphone : public Handphone
{
private:
 
image mms_message;
image[N] mms_inbox;
public:
 
void operator>>(Smartphone &s);
 
void mmsRead();
 
void mmsEdit();
 
 
 
 
 
}